CSharp 相關知識點小結

本文轉載自查看原文 2016-12-20 09:59 2279 CSharp/ CSS/ .Net Core/ JavaScript/ MySQL/ ASP.NET/ Environment/ ASP.NET MVC

1.JS獲取iframe下面的內容
document.getElementById('IFRAME1').contentDocument;

2.dialog 彈出層,定位:postion:'bottom',['right','bottom'],['left','bottom'].

3.IIS上部署WCF; 調用wcf或webapii一定要做安全認證。

cd d:

cd C:\Windows\Microsoft.NET\Framework\v4.0.30319

aspnet_regiis.exe -i

4.項目之間如何調用WCF,怎么調試？比如A項目,調用B項目的wcf服務。
a.先把B項目的wcf部署到IIS上,具體怎么部署？看上面的3
b.在A項目引用B項目部署在IIS上的地址。
c.在B項目中，把IIS的wcf附加到進程,打斷點。
d.運行A項目,打斷點調試。

寫wcf執行的時候，可以作為啟動想，選擇特定的頁為wcf文件，就可以直接輸入參數，點擊執行，返回執行結果。

5.
string a="1";
if (!a.IsNullOrEmpty())
{
//這種寫法第一次看到，其實差不多。
}
if(!string.IsNullOrEmpty(a))
{

}

6.添加wcf可能報錯，需要按如下圖設置：

7.6.mysql 中可以用，Show Create Table '表名'，然后按F8，把創建腳步的語句拷貝出來。

8.用mysql客戶端工具SQLyog,導入腳步，Tools -> Execute sql script.

9.redis 緩存，需要安裝一個軟件，一般情況下不需要做數據的持久化。

10.WCF 修改類具體實現的代碼，引用WCF不需要更新，前提是方法名和參數名稱沒有改。

12.webAPI POSt處理SON數組：（后台是繼承的屬性，一定要用JSON.stringify，不然解析不了），而且前端只能穿一個參數，不然就會報500錯誤。get請求就沒這個限制。

前端代碼：

var mfItemStr = JSON.stringify({ mfItemStr: [{ "CreateId":1, "CreateName": "test1"},{ "CreateId":2, "CreateName": "test2"},{ "CreateId":3, "CreateName": "test3"}]});
    $.ajax({
        url: "/Test/Update",
        type: "post",
        dataType: "json",
        contentType: "application/json",
        data: mfItemStr,
        success: function (data) {
            console.log(data);
            alert("Ok");
        }
    })

CSharp代碼：

[HttpPost]
public HttpResponseMessage Update(JObject recordsSr)
{
    var errMsg = new M_APIError();
           
    try
    {
        if(recordsSr == null)
        {
            errMsg.ErrorCode = -1;
            errMsg.Message = "recordsSr不能為空";
            return Json.toJson(errMsg);
        }

        var str = recordsSr.ToObject<M_MFItem>();

        if (str == null || str.mfItemStr == null || str.mfItemStr.Count <= 0)
        {
            errMsg.ErrorCode = -1;
            errMsg.Message = "已選擇的會員特性不能為空";
            return Json.toJson(errMsg);
        }

        //已選擇的會員特性
        var records = str.mfItemStr;
        int patientId = records.Select(t=>t.PatientID).First();
        if (patientId <= 0)
        {
            errMsg.ErrorCode = -1;
            errMsg.Message = "會員Id不能為空";
            return Json.toJson(errMsg);
        }

        //獲取當前會員的特性記錄
        var exists = new List<M_MemberFeaturesRecord>();
        AspectF.Define.LogAPI(false).Do(() => exists = bll.GetMemberFeaturesRecordByPatientID(patientId));

        if (exists == null && exists.Count <= 0)
        {
            errMsg.ErrorCode = -4;
            errMsg.Message = "當前會員的特性記錄為空";
        }
        else
        {
            //待新增記錄(獲取選中的記錄不在當前會員的特性記錄中的數據)
            var adds = records.Where(c => !exists.Any(e => e.MFItemID == c.MFItemID)).ToList();

            //給當前的特性記錄加上特性名稱，創建人和創建名稱
            exists.ForEach(t =>
            {
                var b = records.Where(a => a.MFItemID == t.MFItemID).FirstOrDefault();
                if (b != null)
                {
                    if (!string.IsNullOrWhiteSpace(b.MFItemName))
                    {
                        t.MFItemName = b.MFItemName;
                    }
                    if (b.CreateID > 0)
                    {
                        t.CreateID = b.CreateID;
                    }
                    if (!string.IsNullOrWhiteSpace(b.CreateName))
                    {
                        t.CreateName = b.CreateName;
                    }
                }
            });

            //待刪除記錄
            var deletes = exists.Where(c => !records.Any(e => e.MFItemID == c.MFItemID)).ToList();

            //新增
            var addResult = 0;
            if (adds != null && adds.Count > 0)
            {
                AspectF.Define.LogAPI(false).Do(() => addResult = bll.BatchInsertMemberFeaturesRecord(adds));

                if (addResult > 0)
                {
                    AddmFRecordLog(patientId, adds, 1);
                }
            }

            //刪除
            List<int> delList = new List<int>();
            bool delResult = false;
            if (deletes != null && deletes.Count > 0)
            {
                string recordIdStr = string.Join(",", deletes);

                if (!string.IsNullOrWhiteSpace(recordIdStr))
                {
                    AspectF.Define.LogAPI(false).Do(() => delResult = bll.BatchDeleteMemberFeaturesRecord(recordIdStr));
                    if (delResult)
                    {
                        AddmFRecordLog(patientId, deletes, 2);
                    }
                }
            }

            if (addResult > 0 && delResult)
            {
                errMsg.ErrorCode = 0;
                errMsg.Message = "成功";
                errMsg.ReturnData = addResult;
            }
            else
            {
                errMsg.ErrorCode = -5;
                errMsg.Message = "失敗";
            }
        }

    }
    catch (Exception ex)
    {
        errMsg.ErrorCode = 500;
        errMsg.Message = ex.Message;
    }
    return Json.toJson(errMsg);
}

13.ADO.NET 執行批量Sql server 的SQL,而mysql不支持,只能把批量的MySQL寫在存儲過程里面，然后調用。

sql server:

declare  @result int;
set @result=-1092
if exists(select top 1 1 from [Order] a where A.OrderCurrentStatus=1 and A.Code=@Code)
begin
    update [Order] set OrderCurrentStatus=2,OrderType=0 where Code=@Code;                   
    --插入日志
    INSERT INTO [OrderTrans]
        ([OrderId],[TransType],[OrderType],[OrderCode],
        [IsResult],[Creater],[CreateDate],[Remark],[BusCode])
        SELECT 0,3,0,@code,1,@Creater,GETDATE(),
        '郵費訂單審核',@code
    set @result=@@error;
end
else
begin
    set @result=1091
end
select @result;

14.h5增加類jquery

document.querySelector(".")

15.優化mysql的SQL,可以用explain,

EXPLAIN SELECT * FROM `accounts`

16.調試Wcf 和webAPI

C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\WcfTestClient.exe 調試調用WCF

調試webapi：

1).可以在chrome 添加插件Postman-REST-Client_v0.8.1

2).下載PC版 Postman-win64-5.0.0-Setup.exe https://download4os.com/postman-4-10-3-60258/

3).firefox 添加插件 httprequester

4).jmeter 參考地址: http://jingyan.baidu.com/article/14bd256e7e707cbb6d2612cf.html?qq-pf-to=pcqq.c2c

5).Fiddler 監控手機app程序和模擬post請求參考如下:

https://www.cnblogs.com/-mrl/p/5081538.html

https://blog.csdn.net/qq_28766327/article/details/52457926

6). 接口的生成工具

http://apidocjs.com/

http://apidoc.tools/

17.MySQL數據庫表字段生成對應的實體：

每個表生成實體類型，如果表字段很多的話，一個一個寫很浪費時間，可以用正則(或動軟代碼生成器)來處理,正則步驟如下：

1.從MySQL中查詢的信息中拿到createTable數據；SHOW CREATE TABLE sys_test
2.通過以下正則來替換
`(\S+)`\s+(\S+).*'(.*)',
        
\t\t\/\/\/<summary>\n\t\t\/\/\/\t\3\n\t\t\/\/\/</summary>\n\t\t\[DataMember\]\n\t\tpublic \2 \1 \{ get; set;\}\n
通過正則之后，可以將table信息統一變成這種格式：
        /// <summary>
        ///     是否接受短信：0-否，1-是
        /// </summary>
        [DataMember]
        public sbyte IsAcceptSMS { get; set; }
3.整理一些類型 ,int\(\d+\)-->int  int\(\d+\)
                nvarchar\(\d+\)/text/char/varchar\(\d+\)--->string    
                tinyint --->sbyte
                date/datetime --->DateTime
                time ---> TimeSpan 
                bigint-->long
                smallint ->short 
                int(11) unsigned -> uint
                double -> double
                bit -> bool
                decimal -> decimal
                blob -> byte[]
                float-> float
                

(\S+)
sInfo\.\1 = info\.\1;

info\.\1 = sInfo\.\1;

\s+

Creator,
CreateTime,
TestLen,
OrderTest,
PlayAmount

先把,逗號替換掉，然后用(\S+)替換成sInfo\.\1 = info\.\1;

注意：可空的上面的正則處理不了。處理方法：非空類型沒有勾選(或為DEFAULT NULL)，C#定義需要可空類型。比如 tinyint 對 sbyte? 也可以通過Show full fields from TableA 看的Null列是否為YES，為YES就加？(字符串類型的不用加)

去掉換行：\s+ 替換為空格

18.uwp(Windows 10開發)

之前用到http://stackoverflow.com/questions/17049677/how-do-i-print-webview-content-in-a-windows-store-app 這個方法還是不行，因為我要打印曲線圖。

a.打印頁面，分頁的方法：https://msdn.microsoft.com/zh-cn/library/windows/apps/xaml/hh465204

代碼：https://code.msdn.microsoft.com/windowsapps/Print-Sample-c544cce6

b.打印webview嵌入html頁面所有內容的方法（啟動程序，打開谷歌瀏覽器，采用window.print打印）：

CSharp代碼：

/// <summary>
/// 打印功能
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void ButtonPrint_Click(object sender, RoutedEventArgs e)
{
    try { await SaveFileAsync(@"Report\jscript\data.js", "var jsonData = " + jsonData); await LaunchFileAsync(@"Report\html\ReportDetail.html"); } catch (Exception ex) { await new MessageDialog("打印失敗").ShowAsync(); } } /// <summary> /// 保存文件 /// </summary> /// <param name="filePath">相對於localfilepath</param> /// <param name="contents">內容</param> /// <param name="options">選項m</param> /// <returns></returns> public static async Task SaveFileAsync(string filePath,string contents,CreationCollisionOption options= CreationCollisionOption.ReplaceExisting) { try { var localFolder = ApplicationData.Current.LocalFolder; var file = await localFolder.CreateFileAsync(filePath, options); await FileIO.AppendTextAsync(file, contents); } catch (Exception ex) { await FileLoger.WriteLog("savefile Error",ex,filePath); } } /// <summary> /// launch file /// </summary> /// <param name="filePath">相對於localfilepath</param> /// <returns></returns> public static async Task LaunchFileAsync(string filePath) { var localFolder = ApplicationData.Current.LocalFolder; var file = await localFolder.CreateFileAsync(filePath, CreationCollisionOption.OpenIfExists); await Windows.System.Launcher.LaunchFileAsync(file); }

JS：方法

function ExecutePrint() {
    setTimeout(function () {
        if ($.browser.mozilla) { document.getElementById("WebBrowserObj").execWB(7, 1); } else { window.print(); } }, 3000); } $(function () { LoadData(jsonData); ExecutePrint(); });

19. (1). mysql 可以利用GROUP_CONCAT把個值拼接在一起，默認以分號相隔。也可以指定其分隔符號。

GROUP_CONCAT(DISTINCT Guardian SEPARATOR ';') Guardian 以分號顯示“a;b;c”

(2).mysql類型為time類型的時候，對應的C#定義為TimeSpan，賦值如下：

DateTime dt = DateTime.Parse("2016-6-29 19:20:30");
TimeSpan times = dt.TimeOfDay;//注意這里賦值

或
var tt = 490;
var ss = TimeSpan.FromMinutes(tt);

(3).C# 執行mysql腳本可以這樣一起寫：

INSERT INTO sys_log(`PatientID`,`MFItemID`,`MFItemName`,`CreateID`,`CreateName`,
                                    `UpdateID`,`CreateTime`,`UpdateTime`,`DoctorID`,`DoctorName`,`DrID`,`DrName`,`OperationType`,`Remark`,`CARecordID`)
SELECT @NewPatientID,`MFItemID`,`MFItemName`,`CreateID`,`CreateName`,`UpdateID`,`CreateTime`,`UpdateTime`,`DoctorID`,`DoctorName`,`DrID`,`DrName`,`OperationType`,`Remark`,@RecordId FROM sys_log WHERE `RecordLogID`=@RecordLogID;

(4).用CONCAT拼接字符串 LIKE CONCAT('%',@Title,'%')

(5).mysql獲取自增的列的方法：區別可以參考：MYSQL LAST_INSERT_ID() 自增列詳解和 MySQL獲取自增主鍵ID的四種方法

SELECT @@IDENTITY;
SELECT LAST_INSERT_ID();

(6).寫方法，盡量使用參數，而不用直接傳值，防止SQL注入，參數化安全性高些。比如select * from A where id in(1,2,3)，可以select * from A where 1= 1 and (id=1 or id =2 or id=3) 。具體如下（注意紅色標注的代碼）：

public List<M_MTest> GetTetItemIds(int[] itemId)
{
    if (itemId == null || itemId.Length < 1) return null; const string sqlText = @"select * from Test where MFItemID=@ItemId"; var where = new StringBuilder(30, 30 * itemId.Length); var param = new List<MySqlParameter>(); where.Append(" AND "); if (itemId.Length == 1) { where.Append("MFItemID=@ItemId "); param.Add(new MySqlParameter("@ItemId", itemId[0])); } else { where.Append("( "); for (var i = 0; i < itemId.Length; i++) { where.Append("MFItemID=@ItemId"); where.Append(i); if (i < itemId.Length - 1) { where.Append(" OR "); } param.Add(new MySqlParameter("@ItemId" + i, itemId[i])); } where.Append(" )"); } var result = MySqlHelper.ExecuteDataTable( MySqlHelper.ConnectionStringRemp, CommandType.Text, sqlText + @where, param.ToArray() ); return result.ConvertToList<M_MTest>(); }

int[] orgId;
const string sql =
    "SELECT `MFTypeID`,`MFTypeName`,`MFTypeParentID`,`MFTypePath`,`MFTypeLevel`,`MFTypeOrder`,`Description`,`IsSystem`,`IsPushApp`,`IsDeleted`,`OrgID`,`CreateID`,`CreateTime`,`UpdateID`,`UpdateTime`,IFNULL((SELECT MFTypeID FROM sys_memberfeaturestype WHERE MFTypeParentID = s.MFTypeID limit 0,1),0) IsHasSub  FROM sys_memberfeaturestype s where MFTypeParentID != -1 AND IsDeleted = 0"; var where = new StringBuilder(); var param = new List<MySqlParameter>(); if (orgId != null && orgId.Any()) { if (orgId.Length == 1) { where.Append(" AND (OrgID = @OrgId OR OrgID = 0)"); param.Add(new MySqlParameter("@OrgId", orgId[0])); } else { where.Append(" AND ( OrgID = 0"); for (var i = 0; i < orgId.Length; i++) { where.Append(" OR"); where.Append(" OrgID = @OrgId"); where.Append(i); param.Add(new MySqlParameter("@OrgId" + i, orgId[i])); } where.Append(" )"); } }

對比：

if (orgIds != null && orgIds.Count > 0)
{
    baseSql.AppendFormat(" and !d.IsDeleted and d.OrganizationID in (");
    foreach (var orgId in orgIds)
    {
        baseSql.AppendFormat("{0},", orgId);
    }
    baseSql.Remove(baseSql.Length - 1, 1);
    baseSql.AppendFormat(")");
}

(7).mysql 批量新增：insert into Test(Id,name) value(1,"t"),(2,"test");

/// <summary>
///批量新增
/// </summary>
/// <param name="listTest">集合</param>
/// <returns></returns>
public int BatchInsertTEst(List<M_Test> listTest)
{
    if (listTest == null || listTest.Count <= 0) { LogHelper.AddErrorLog("沒有記錄", "", ""); return -1; } var strSql = new StringBuilder( "INSERT INTO sys_Test(`PatientID`,`MFItemID`,`CreateID`,`CreateTime`) "); var mysqlParam = new List<MySqlParameter>(); for (var i = 0; i < listTest.Count; i++) { var item = listTest[i]; if (i == 0) { strSql.AppendFormat(" VALUES(@PatientID{0},@MFItemID{0},@CreateID{0},@CreateTime{0})", i); } if (i > 0) { strSql.AppendFormat(",(@PatientID{0},@MFItemID{0},@CreateID{0},@CreateTime{0})", i); } mysqlParam.Add(new MySqlParameter(string.Format("@PatientID{0}", i), item.PatientID)); mysqlParam.Add(new MySqlParameter(string.Format("@MFItemID{0}", i), item.MFItemID)); mysqlParam.Add(new MySqlParameter(string.Format("@CreateID{0}", i), item.CreateID)); mysqlParam.Add(new MySqlParameter(string.Format("@CreateTime{0}", i), item.CreateTime)); } try { var num = MySqlHelper.ExecuteNonQuery(MySqlHelper.connectionStringRemp, CommandType.Text, strSql.ToString(), mysqlParam.ToArray()); return num; } catch (Exception ex) { LogHelper.AddErrorLog("批量新增失敗", ex.ToString(), ""); return 0; } }

注意：這里沒考慮大數據的問題，如一次性插入10萬數據，就不能這樣處理。可以通過多線程的方式，每次給DB中添加1000條，另外的話還需要加上事務。可以參考下面的代碼：

//設置CPU給當前應用程序分配的最小線程數
System.Threading.ThreadPool.SetMinThreads(100, 100);
var list = new List<Task>(); var count = 10000*10000;//1千萬條 var num = 1000;//每次循環條數 for (int j = 0; j < count; j++) { //每次1000條數據 for (int i = 0; i < num; i++) { var result = Task.Run(() => { //插入DB  }); list.Add(result); } //等待1000個線程跑完  Task.WaitAll(list.ToArray()); count = count - num; }

(8).批量修改：

/// <summary>
///     批量修改
/// </summary>
/// <param name="listmfRecordlog"></param>
/// <returns>是否成功</returns>
public bool BatchUpdateTest(List<M_Test> listTest) { var strSql = new StringBuilder(); var mysqlParam = new List<MySqlParameter>(); for (var i = 0; i < listTest.Count; i++) { var item = listTest[i]; strSql.AppendFormat( "UPDATE sys_Test SET UpdateName = @UpdateName{0},UpdateTime=@UpdateTime{0},UpdateID=@UpdateID{0},OperationType=@OperationType{0} WHERE RecordLogID=@RecordLogID{0};", i); mysqlParam.Add(new MySqlParameter(string.Format("@UpdateName{0}", i), item.UpdateName)); mysqlParam.Add(new MySqlParameter(string.Format("@UpdateTime{0}", i), item.UpdateTime)); mysqlParam.Add(new MySqlParameter(string.Format("@UpdateID{0}", i), item.UpdateID)); mysqlParam.Add(new MySqlParameter(string.Format("@OperationType{0}", i), item.OperationType)); mysqlParam.Add(new MySqlParameter(string.Format("@CreateName{0}", i), item.CreateName)); mysqlParam.Add(new MySqlParameter(string.Format("@RecordLogID{0}", i), item.RecordLogID)); } try { var num = MySqlHelper.ExecuteNonQuery(MySqlHelper.ConnectionStringRemp, CommandType.Text, strSql.ToString(), mysqlParam.ToArray()); return num > 0; } catch (Exception ex) { LogHelper.AddErrorLog("批量修改失敗", ex.ToString(), ""); return false; } }

(9).拼接SQL別用where 1=1，然后再拼接and，where 1=1 會先檢索全表

const string sql = @"select * from table ";
var where = new StringBuilder();
if (!string.IsNullOrWhiteSpace(xx))
{
   where.AppendFormat(" where id = {0}",xx);
}
if (!string.IsNullOrWhiteSpace(yy))
{
   where.Append(where.Length > 1 ? " and" : "where");
   where.AppendFormat(" name = {0}",yy);
}
var sqlstr = sql + where;

20.SQL里面如果排序不了，可以多利用linq 或lamber表達式排序。

21.前端JS通過數組，傳一個對象給ASP.net MVC 的后台方法。后台定義一個實體類和前端的名稱一致，Mvc會自動轉化。

JS代碼：

function btnSave() {
    var btnSave = document.getElementById("btnSave"); //將表單提交按鈕設置為不可用，這樣就可以避免用戶再次點擊提交按鈕 btnSave.disabled = true; if ($("#Remark").val() == "") { alert("備注不能為空"); btnSave.disabled = false; return false; } var data = {}; data["data.CallStatus"] = $("#CallStatus").val(); data["data.ITime"] = $("#ITime").val(); data["data.Remark"] = $("#Remark").val(); data["data.IResult"] = $("#IResult").val(); $.ajax({ type: 'post', url: "/TestWeb/TestActivity/TestDetail", datatype: 'json',//返回json格式的數據  data: data, error: function (XHR) { alert('網絡異常，請稍候再試'); btnSave.disabled = false; }, success: function (data) { if (data.Success) { alert("添加成功"); } else { alert("添加失敗"); } } }); }

C#代碼：

[HttpPost]
public JsonResult TestDetail(M_TestDetail data)//這里data要和前端的data["data.CallStatus"] 中括號里面的data名稱一樣，對應的字段名該實體類字段名稱一樣。MVC會自動轉化 { var msg = new ResultMsgInfo(); msg.Msg = "保存成功"; msg.Success = true; return Json(msg, JsonRequestBehavior.AllowGet); }

M_TestDetail實體類：

[DataContract]
public class M_TestDetail { ///<summary> /// 邀約電話接通情況：0 接聽成功 1 無人接聽 2 拒接 3 信息錯誤 4 空號 5 號碼過期 6 未接通 7 通話中 ///</summary>  [DataMember] public sbyte? CallStatus { get; set; } ///<summary> /// 同意到場時間 ///</summary>  [DataMember] public string ITime { get; set; } ///<summary> /// 備注 ///</summary>  [DataMember] public string Remark { get; set; } ///<summary> /// 邀約結果：0 無 1 來 2 不來 3 待定 4 重新邀約 ///</summary>  [DataMember] public sbyte? IResult { get; set; } }

22.Json轉換實體,使用 Deserialize<M_TestDetail>(jsonData); 需要引入Newtonsoft.Json.dll

public T Deserialize<T>(string json)
{
    T obj = Activator.CreateInstance<T>(); var result = JsonConvert.DeserializeObject<T>(json); return result; }

23.ASP.Net MVC

(1).頁面判斷，里面的文本需要加<text></text>,如下：

 <input type="checkbox" @if (dateAm != null && dateAm.Count > 0) {<text> checked="checked"</text> }/>

(2). Html.RenderAction的使用

cshtml 代碼：

@{Html.RenderAction("JudgementStatus", new { num = item.CallStatus, statusName = "CallStatus" });}

控制器的C#代碼：

/// <summary>
/// 獲取狀態描述
/// </summary>
/// <param name="num"></param>
/// <param name="statusName"></param>
/// <returns></returns>
public string JudgementStatus(sbyte? num, string statusName)
{
    var str = string.Empty; switch (statusName) { case "CallStatus": if (num.HasValue) { switch (num.Value) { //0 接聽成功 1 無人接聽 2 信息錯誤 3 拒接 4 空號 5 號碼過期 6 未接通 7 通話中 case 0: str = "接聽成功"; break; case 1: str = "無人接聽"; break; case 2: str = "拒接"; break; case 3: str = "信息錯誤"; break; case 4: str = "空號"; break; case 5: str = "號碼過期"; break; case 6: str = "未接通"; break; case 7: str = "通話中"; break; default: str = ""; break; } } else { str = ""; break; } break; case "IsSign": if (num.HasValue) { switch (num.Value) { case 0: str = "未到場"; break; case 1: str = "已到場"; break; default: str = ""; break; } } else { str = "未到場"; break; } break; } return str; }

24.時間處理的時候，不要用js的toLocaleDateString(); 因為兼容性不好,還要考慮到服務器后台解析的兼容性，在Microsoft Edge序列化數組的時候，傳到后台mvc，反序列化DataTime直接報錯，而且把datatime改成string,然后通過Convert.ToDateTime("2016-8-29")轉化不了，原因是編碼的問題，當我把2016-8-29拷貝到記事本里面保存，然后重新打開直接出現？。可以改成拼接的寫法：

var start = new Date($("#StartDate").val());  
new Date(start).toLocaleDateString(); 上面的寫法改成如下： var month = new Date(start).getMonth() + 1; var datatostring = new Date(start).getFullYear() + "-" + month + "-" + new Date(start).getDate(); var _oneDay = new Date(start.setDate(start.getDate() + 1)); var month = new Date(_oneDay).getMonth() + 1; var datatostring = new Date(start).getFullYear() + "-" + month + "-" + new Date(start).getDate(); IE10出現兼容性可以用下面的方法處理： .replace("年", "/").replace("月", "/").replace("日", "").replace(/\?/g, ""); .replace("-", "/") replace("/", "-")

25.JS： var re = /^[0-9]*[1-9][0-9]*$/;　　//正整數

.replace(/\?/g, "");去掉?

26.展示mysql變量的函數 SHOW VARIABLES LIKE '%skip%';

27.C#訪問本地mysql出現“ HOST 'test' IS NOT allowed TO connect TO this MySQL server” ?

解決方法：(1).如下圖 (2).找到安排目錄的C:\Program Files\MySQL\MySQL Server 5.5\my.ini，打開my.ini，加上skip_name_resolve=1，重啟mysql服務。

28.jQuery 可以通過commitForm提交表單，mvc接受值，建議使用FormCollection取值，不要使用request取值

<form id="f1" method="POST">
    <h2>AddAddress</h2>
    <input type="text" name="Address"/>
    <input type="text" name="Name"/>
    <input id="Submit1" type="submit" value="submit"/>
</form>
<script type="text/javascript">
    $(function() { $("#f1").commitForm({ url: '/home/test', callBack:function(data) { alert(data); } }); }); </script>

29.大數據並發出來：a.負載均衡（建多個站點,nginx(參考https://lufficc.com/blog/configure-nginx-as-a-web-server) ） b.使用緩存

30.數據的同步可以通過Quartz.net 寫job處理，需要按時間來升序，需要考慮到相同時間的數據。

31.mysql 調用存儲過程

SET @iDrID=2;
SET @vPatientName='';
SET @vSchemeTitle='';
SET @dSCreateTime='';
SET @dECreateTime='';
SET @iCheckSuggestFlag=-1;
SET @iCurrentPageIndex=0;
SET @iPageSize=10;
CALL proc_Scheme_QueryList(@iDrID,@vPatientName,@vSchemeTitle,@dSCreateTime,@dECreateTime,@iCheckSuggestFlag,@iCurrentPageIndex,@iPageSize,@iRowCount);
SELECT @iRowCount;

32.C#發送http 請求：1.HttpWebRequest 2.HttpClient（webapi）

33.直接返回某列的list集合

public List<int> GetAlltestIds()
{
    const string sql = " select testId from sys_test  ";

    var ds = MySqlHelper.ExecuteDataSet(ConnectionStringConfig.DataCenter, CommandType.Text, sql, new MySqlParameter[] { });

    var list = ds.Tables[0].Rows.Cast<object>().Select((r, i) => Convert.ToInt32(ds.Tables[0].Rows[i][0])).ToList();

    return list;
}

34.通過ASP.MVC自帶的傳參數到后台進行新增

public ActionResult Register()
{
    var vmodel = new M_UserTest();
    return View(vmodel);
}

public ActionResult RegisterTest(M_UserTest data)
{
    var result = bll.Add(data);
    return View();
}

@using Model @model M_UserTest
@{
    ViewBag.Title = "Register";
}

<h2>Register</h2>
<div class="row">
    <div class="col-md-8">
        <section id="loginForm">
            @using (Html.BeginForm("RegisterTest", "Home", new { ReturnUrl = ViewBag.ReturnUrl }, FormMethod.Post, new { @class = "form-horizontal", role = "form" }))
            {
                <div class="form-group">
                    <label class="col-md-2 control-label">用戶名</label>
                    <div class="col-md-10">
                        @Html.TextBoxFor(m => m.username, new { @class = "form-control" })
                    </div>
                </div>
                <div class="form-group">
                    <label class="col-md-2 control-label">賬號</label>
                    <div class="col-md-10">
                        @Html.TextBoxFor(m => m.userAccount, new { @class = "form-control" })
                    </div>
                </div>
                <div class="form-group">
                    <label class="col-md-2 control-label">密碼</label>
                    <div class="col-md-10">
                        @Html.PasswordFor(m => m.userPwd, new { @class = "form-control" })
                    </div>
                </div>
                <div class="form-group">
                    <div class="col-md-offset-2 col-md-10">
                        <input type="submit" value="注冊" class="btn btn-default" />
                    </div>
                </div>
            }
        </section>
    </div>
</div>

35.MySQL修改字段默認值和修改字段長度

use `test_ch`;
/*修改字段默認值*/
alter table hm_test modify AuditStatus tinyint not null default 1 comment '審核狀態 0.未審核，1.已審核';
/*修改字段長度*/
alter table hm_test modify column Summary varchar(2000);

36.C#把字符串數組轉化成List

/// <summary>
/// 把字符串數組轉化成List
/// </summary>
/// <param name="target">字符串</param>
/// <returns></returns>
public static List<int> AsList(this string[] target)
{
    var arr = new List<int>();
    if (target == null || target.Length == 0) return arr;
    Array.ForEach(target, id =>
    {
        int tmpId;
        if (int.TryParse(id, out tmpId))
        {
            arr.Add(tmpId);
        }
    });
    return arr;
}

string scGoodIds = "1,2,,3,4,5,6,7";
var ids = scGoodIds.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries).AsList();

37.用EF寫出一條分頁語句，頁碼數是1，頁大學為20. 可參考LINQ系列：LINQ to SQL Take/Skip

pageIndex PageSize

var reulst = (from u in uList
orderby u.toolingNo
select u).Skip(pageSize *(pageIndex -1)).Take(pageSize);

OrderBy 是排序（后面是條件）然后要查詢所有的，在所有的數據中在查詢你要分頁的數據，skip是在分頁在前有多少條數據，也就是在當前頁數據之前的數據總和，(跳過序列中指定數量的元素，然后返回剩余的元素。)pageSize*(pageIndex-1),Take 是返回多少條數據，也就是pageSize!

38.ling分組，處理

var IaidList = times.GroupBy(p => p.IAId).ToDictionary(p => p.Key, r => r.Select(o => o)).OrderBy(p => p.Key).ToList();

2)linq 分組去除重復的某項

var result = testItem.GroupBy(t => t.TestItemCode).Select(t => t.OrderByDescending(p => p.CreatedTime).OrderByDescending(p => p.TestItemID).FirstOrDefault());

3).分組匯總

q = q.GroupBy(t => t.CreateDate).Select(g => new TestData
{
    CreateDate = g.Key,
    Num = g.Sum(p => p.Num),
});

39.Quartz.net 安裝服務和卸載服務

安裝服務：

@Test.exe install
@pause
@exit

保存記事本里面，后綴名為.bat

卸載服務：

@Test.exe uninstall
@net start Test
@pause
@exit

40.C# 對象轉jSON 時過濾 NULL 的屬性參考：https://q.cnblogs.com/q/72031/ http://www.newtonsoft.com/json/help/html/ReducingSerializedJSONSize.htm 需要引用Newtonsoft.Json.dll

public class Person
{
    public int Id { get; set; }

    public string Name { get; set; }
}

static void Main(string[] args)
{
    var list = new List<Person>();

    for (int i = 1; i < 5; i++)
    {

        list.Add(new Person()
        {
            Id = i,
            Name = "test" + i
        });
    }

    list.Add(new Person()
    {
        Id = 5,
        Name = null,
    });

    string ignored = JsonConvert.SerializeObject(list, Formatting.Indented, new JsonSerializerSettings { DefaultValueHandling = DefaultValueHandling.Ignore });
    //[{"Id":1,"Name":"test1"},{"Id":2,"Name":"test2"},{"Id":3,"Name":"test3"},{"Id":4,"Name":"test4"},{"Id":5}]

    var test = JsonConvert.DeserializeObject<List<Person>>(ignored);
            
    Console.ReadLine();
}

41.怎么監控EF生成的sql

1).EntityFramework Profiler，下載地址：https://hibernatingrhinos.com/products/EFProf

2). 如果是SQL server 可以用SQL Server Profiler, 具體可以參考：http://www.cnblogs.com/allenhua/p/3533975.html

42.去掉webapi的token驗證。在compilation 家debug="true" 。 <compilation debug="true" targetFramework="4.5" />

43. IIS初始化（預加載），解決第一次訪問慢，程序池被回收問題

44.計算時間

Stopwatch stopwatch = new Stopwatch();
//第一次計時
stopwatch.Start();
Console.WriteLine("Stopwatch is running:{0}",stopwatch.IsRunning);//判斷當前Stopwatch的狀態
System.Threading.Thread.Sleep(1000);//耗時操作
stopwatch.Stop();
Console.WriteLine("Using Elapsed output runTime:{0}", stopwatch.Elapsed.ToString());//這里使用時間差來輸出
Console.WriteLine("Using ElapsedMilliseconds output runTime:{0}", stopwatch.ElapsedMilliseconds);//這里面使用毫秒來輸出

45.調用數據庫或服務，一定要釋放。可以通過查看oracle的連接數來看是否是否資源 select count(*) from v$session;

1).單個寫

using (testService as IDisposable)
{
    persont = testService.GetTest(name);
}

2).在基類寫，實現IDisposable。

private bool disposed = false;
protected virtual void Dispose(bool disposing)
{
    if (!this.disposed)
    {
        if (disposing && _context != null)
        {
            _context.Dispose();
        }
    }
    this.disposed = true;
}

public void Dispose()
{
    Dispose(true);
    GC.SuppressFinalize(this);
}

46. EF 修改數據出現：Attaching an entity of type 'HR_TEST' failed because another entity of the same type already has the same primary key value. This can happen when using the 'Attach' method or setting the state of an entity to 'Unchanged' or 'Modified' if any entities in the graph have conflicting key values. This may be because some entities are new and have not yet received database-generated key values. In this case use the 'Add' method or the 'Added' entity state to track the graph and then set the state of non-new entities to 'Unchanged' or 'Modified' as appropriate.

原先代碼：

public bool Update(TEntity entity)
{
    _context.Entry<TEntity>(entity).State = EntityState.Modified;
    return _context.SaveChanges() > 0;
}

改成：

public bool Update(TEntity entity, Func<TEntity, int> getKey)
{
    // Retreive the Id through reflection

    var entry = _context.Entry<TEntity>(entity);
    if (entry.State == EntityState.Detached)
    {
        var set = _context.Set<TEntity>();
        TEntity attachedEntity = set.Find(getKey(entity));  // access the key
        if (attachedEntity != null)
        {
            var attachedEntry = _context.Entry(attachedEntity);
            attachedEntry.CurrentValues.SetValues(entity);
            AttachedEntry.State = EntityState.Modified;
        }
        else
        {
            set.Attach(entity);
            entry.State = EntityState.Modified; // attach the entity
        }
    }

    return _context.SaveChanges() > 0;
}

47.可以用action定義實體轉化

//定義動態映射函數
Action<Patient> action = (Patient member) =>
{
    person.Name = member.Name;
    person.Gender = member.Sex;
    person.BirthDate = !string.IsNullOrWhiteSpace(member.Birthday) ? member.Birthday.Replace("-", "") : person.BirthDate;//系統中的生日全部是yyyyMMdd格式
    person.Nationality = member.Ethnic;
    person.CensusAddressName = member.Domicile;
    person.Country = country;
    person.IDNumber = idcard;
    person.IDType = idType;
};

48.C#生成隨機流水號:

public static string GenerateOrderId()
{
    string text = string.Empty;
    System.Random random = new System.Random();
    for (int i = 0; i < 7; i++)
    {
        int num = random.Next();
        text += ((char)(48 + (ushort)(num % 10))).ToString();
    }
    return System.DateTime.Now.ToString("yyyyMMdd") + text;
}

49.redis加入到Windows 服務

安裝命令:

redis-server.exe --service-install redis.windows.conf --loglevel verbose
卸載命令：
redis-server --service-uninstall

50.異步調用

1).

Task.Run(() =>
{
    Test();
});

2).

Action act = () => Test();
act.BeginInvoke(t => act.EndInvoke(t), null);

51.C# 調用webApi

1).webpai Post

[Route("CheckUp"), HttpPost]
public IHttpActionResult CheckUp(CheckUp request)
{
    return Ok(new { Status = 0, Msg = "" });
}

調用代碼

1).

/// <summary>
///  需要引用 System.Net.dll,System.IO.dll
/// </summary>
/// <param name="url">url</param>
/// <param name="headers">頭文信息</param>
/// <param name="format">格式</param>
/// <param name="formData">傳入數據格式</param>
/// <returns></returns>
public static string Post(string url, Dictionary<string, string> headers, string format, string formData)
{
    byte[] postData = Encoding.UTF8.GetBytes(formData);

    HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
    request.Method = "POST";
    request.AllowAutoRedirect = false;
    request.ContentType = format+";charset=utf-8";
    request.KeepAlive = false;
    request.ProtocolVersion = HttpVersion.Version10;
    request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.6)";
    if (headers != null)
    {
        foreach (KeyValuePair<string, string> item in headers)
        {
            request.Headers.Add(item.Key, item.Value);
        }
    }

    request.ContentLength = postData.Length;
    // 開始請求
    using (Stream postStream = request.GetRequestStream())
    {
        postStream.Write(postData, 0, postData.Length);
    }

    HttpWebResponse response = request.GetResponse() as HttpWebResponse;
    Stream s = response.GetResponseStream();
    StreamReader reader = new StreamReader(s, Encoding.GetEncoding("UTF-8"));
    string result = reader.ReadToEnd();
    reader.Close();
    s.Close();
    if (response != null)
        response.Close();
    if (request != null)
        request.Abort();
    return result;
}
Post(url, new Dictionary<string, string>(), "application/json", JsonConvert.SerializeObject(checckup));

2).

//定義Request 並設置request的路徑
WebRequest request = WebRequest.Create(url);
request.Method = "post";

//設置參數的編碼格式，解決中文亂碼
byte[] byteArray = Encoding.UTF8.GetBytes(data);

//設置Request的MINE類型及內容長度
request.ContentType = "application/json";
request.ContentLength = byteArray.Length;

//打開request字符流
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();

//定義response為前面的request響應
WebResponse response = request.GetResponse();

//獲取相應的狀態代碼
var str = ((HttpWebResponse)response).StatusCode;

//定義response字符流
dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string responseFormServer = reader.ReadToEnd();//讀取所有

3).

url = url + "/api/test/login";
var list = request.ToDictionary();
var data = new NameValueCollection();
foreach (var item in list)
{
    if (item.Value != null)
    {
        data.Add(item.Key, item.Value.ToString());
    }
}
WebClient wc = new WebClient();
byte[] result = wc.UploadValues(url, "POST", data);
var response = System.Text.Encoding.UTF8.GetString(result);

4).http get 和post 調用webapi 方法

#region post信息
/*
string content = Post('url', new Dictionary<string, string>(), "application/json", Utils.ModelToJson(new testModel
        {
            testcard = '',
            testtype = ''
        })) 
*/
/// <summary>
/// post信息
/// </summary>
/// <param name="url"></param>
/// <param name="headers"></param>
/// <param name="format"></param>
/// <param name="formData"></param>
/// <returns></returns>
public static string Post(string url, Dictionary<string, string> headers, string format, string formData)
{
    byte[] postData = Encoding.UTF8.GetBytes(formData);

    HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
    request.Method = "POST";
    request.AllowAutoRedirect = false;
    request.ContentType = format+";charset=utf-8";
    request.KeepAlive = false;
    request.ProtocolVersion = HttpVersion.Version10;
    request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.6)";
    if (headers != null)
    {
        foreach (KeyValuePair<string, string> item in headers)
        {
            request.Headers.Add(item.Key, item.Value);
        }
    }

    request.ContentLength = postData.Length;
    // 開始請求
    using (Stream postStream = request.GetRequestStream())
    {
        postStream.Write(postData, 0, postData.Length);
    }

        HttpWebResponse response = request.GetResponse() as HttpWebResponse;
    Stream s = response.GetResponseStream();
    StreamReader reader = new StreamReader(s, Encoding.GetEncoding("UTF-8"));
    string result = reader.ReadToEnd();
    reader.Close();
    s.Close();
    if (response != null)
        response.Close();
    if (request != null)
        request.Abort();
    return result;
}
#endregion

#region 獲取get消息
/// <summary>
///  獲取get消息
/// </summary>
/// <param name="format">xml,json選擇返回</param>
/// <param name="url"></param>
/// <param name="headers"></param>
/// <returns> HttpHelper.Get("json", url + "/api/patient/getpatientbyphone?phone=" + phoneNo, null);</returns>
public static string Get(string format,   string url, Dictionary<string, string> headers)
{
    HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
    request.Method = "GET";
    request.AllowAutoRedirect = false;
    request.ContentType = "text/" + format + ";charset=utf-8";
    request.KeepAlive = false;
    request.ProtocolVersion = HttpVersion.Version10;
    request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.6)";
    if (headers != null)
    {
        foreach (KeyValuePair<string, string> item in headers)
        {
            request.Headers.Add(item.Key, item.Value);
        }
    }
    HttpWebResponse response = request.GetResponse() as HttpWebResponse;
    Stream s = response.GetResponseStream();
    StreamReader reader = new StreamReader(s, Encoding.GetEncoding("UTF-8"));
    string result = reader.ReadToEnd();
    reader.Close();
    if (s != null) s.Close();
    response.Close();
    request.Abort();
    return result;
}
#endregion

get and post

5).webapi

[Route("CheckUp"), HttpPost]
public IHttpActionResult CheckUp([FromBody] string baseRequest)
{
}

調用代碼

//設置HttpClientHandler的AutomaticDecompression  
var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip };
//創建HttpClient（注意傳入HttpClientHandler）  
using (var http = new HttpClient(handler))
{
    //使用FormUrlEncodedContent做HttpContent  
    var content = new FormUrlEncodedContent(new Dictionary<string, string>() {
        {"",data}//鍵名必須為空,data為json字符串
    });

    //await異步等待回應  

    var response = await http.PostAsync(url, content);
    //確保HTTP成功狀態值  
    response.EnsureSuccessStatusCode();
    //await異步讀取最后的JSON（注意此時gzip已經被自動解壓縮了，因為上面的AutomaticDecompression = DecompressionMethods.GZip）  
    await response.Content.ReadAsStringAsync();
}

52. C# async和await string 轉為Task<string>

public static async Task<string> Test(string[] inputs)
{
    StringBuilder sBuilder = new StringBuilder();
    for (int i = 0; i < 10; i++)
    {
        sBuilder.Append(i.ToString("x2"));
    }
    return await Task.FromResult(sBuilder.ToString());
}

53. 實體轉化不用重新寫方法，可以用委托（Action<T>）來實現，demo如下：

private void Test(PersonInfoModels data)
{

  Action<PersonInfoModels> action = (PersonInfoModels m) =>
  {
    person.Name = m.Name; 
  }

  if (data != null)
  {
     //調用
     action(data);
  }
}

54.Linq To Sql中實現Left Join與Inner Join使用Linq語法與lambda表達式

當前有兩個表，sgroup與sgroupuser，兩者通過gKey關聯，而sgroup表記錄的是組，而sgroupuser記錄是組中的用戶，因此在sgroupuser中不一定有數據。需要使用Left Join獲取數據：
Linq語法如下:
var sg = (from g in dc.sgroup
join gu in dc.sgroupuser on g.gKey equals gu.gKey into l
from lgu in l.DefaultIfEmpty()
select new { g, lgu }).ToList();
Lambda表達式如下：
var sg = dc.sgroup.GroupJoin(dc.sgroupuser, g => g.gKey, gu => gu.gKey, (g, gu) => new { g, gu }).Select(o=>o).ToList() ;
注意:
Linq 與Lambda表達式取出的結果有所不同.Linq取出的結果的記錄數與Sql中的Left Join的結果相同,而Lambda表達式取出的記錄數是sgroup表中的記錄數,sgroupuser對應的記錄是以對象集合存在於結果中
附:
下面是Inner Join:
Linq語法如下:
var sg = (from g in dc.sgroup
join gu in dc.sgroupuser on g.gKey equals gu.gKey
select new { g, gu }).ToList();
Lambda表達式如下：
var sg = dc.sgroup.Join(dc.sgroupuser, g => g.gKey, gu => gu.gKey, (g, gu) => new { g, gu }).Select(o=>o).ToList() ;
注意:
上面最后都用到了ToList()方法 , 用ToList()是為了一次性將數據取到本地

http://www.cnblogs.com/xinjian/archive/2010/11/17/1879959.html

55.

1).linq 實現left join,並在on 后面添加and

var list = from a in bloodlist join b in sugarlist on new { a.OrganizationID,a.MonitorDate } equals new { b.OrganizationID, b.MonitorDate } into sugarTemp
                from newb in sugarTemp.DefaultIfEmpty()
                select new DetectData {
                    OrganizationID = a.OrganizationID,
                    MonitorDate = a.MonitorDate,
                    DayBloodPressureNum = a.DayBloodPressureNum,
                    DaySugarPressureNum = newb != null ? newb.DaySugarPressureNum : 0
                };

2).let

result = (from b in bloodlist
                          join s in sugarlist on new { b.OrganizationID, b.MonitorDate } equals new { s.OrganizationID, s.MonitorDate } 
                          select new BI_IndexDetectData
                          {
                              MonitorDate = b.MonitorDate,
                              OrganizationID = b.OrganizationID,
                              DayBloodPressureNum = b.DayBloodPressureNum,
                              DaySugarPressureNum = s.DaySugarPressureNum,
                          }).ToList();
            var result1 = (from b in bloodlist
                           join s in sugarlist on new { b.OrganizationID, b.MonitorDate } equals new { s.OrganizationID, s.MonitorDate }
                           let daySugarPressureNum = s.DaySugarPressureNum
                           where s.DaySugarPressureNum > 0
                           select new BI_IndexDetectData
                           {
                               MonitorDate = b.MonitorDate,
                               OrganizationID = b.OrganizationID,
                               DayBloodPressureNum = b.DayBloodPressureNum,
                               DaySugarPressureNum = daySugarPressureNum,
                           }).ToList();

56.C#遞歸根據日期分頁獲取所有滿足條件的體檢信息

調用 var dataresult = GetPageOfAllCheckUpRegInfo(pageIndex, pageSize, BeginCheckDate.Value, endCheckUpDate.Value,isVip);

#region 根據總檢日期和頁碼獲取所有滿足條件的體檢登記信息
/// <summary>
/// 根據總檢日期和頁碼獲取所有滿足條件的體檢登記信息
/// </summary>
/// <param name="pageIndex">當前頁碼</param>
/// <param name="pageSize">頁大小</param>
/// <param name="bcheckUpDate">總檢開始日期</param>
/// <param name="echeckUpDate">總檢結束日期</param>
/// <returns></returns>
private List<CheckUpRegInfo> GetPageOfAllCheckUpRegInfo(int pageIndex, int pageSize, DateTime bcheckUpDate, DateTime echeckUpDate, string isVip)
{
    var result = new List<CheckUpRegInfo>();
    // 遞歸獲取所有滿足條件的體檢登記信息
    GetAllCheckUpRegInfo(pageIndex, pageSize, bcheckUpDate, echeckUpDate,isVip,result);
    return result;
}
#endregion

#region 遞歸獲取體檢登記信息
/// <summary>
/// 遞歸調用
/// </summary>
/// <param name="pageIndex">當前頁碼</param>
/// <param name="pageSize">頁大小</param>
/// <param name="bcheckUpDate">總檢開始日期</param>
/// <param name="echeckUpDate">總檢結束日期</param>
/// <param name="isVip">是否vip</param>
/// <param name="result">返回結果</param>
private void GetAllCheckUpRegInfo(int pageIndex, int pageSize, DateTime bcheckUpDate, DateTime echeckUpDate,string isVip,List<CheckUpRegInfo> result)
{
    try
    {
        var req = new CheckUpDataInput();
        req.BeginCheckDate = bcheckUpDate;
        req.EndCheckDate = echeckUpDate;
        req.PageSize = pageSize;
        req.PageIndex = pageIndex;
        req.SortType = false;
        req.OrderBy = "JCRQ";//總檢日期
        req.IsVip = isVip;
        CheckService = new AutoCheckService(req);
        var dataResult = CheckService.GetPageOfCheckUpRegInfo();
        //釋放資源
        using (CheckService as IDisposable) { }

        if (dataResult != null && dataResult.ResultCode == 100)
        {
            var list = dataResult.Result.ToList();
            if (list != null && list.Count > 0)
            {
                var PageCount = dataResult.PageCount;
                //本頁執行完成，繼續執行下一頁
                if (pageIndex <= PageCount)
                {
                    pageIndex++;
                    result.AddRange(list);
                    GetAllCheckUpRegInfo(pageIndex, pageSize, bcheckUpDate, echeckUpDate, isVip, result);
                }
            }
        }
    }
    catch (Exception ex)
    {
        WriteLog("GetAllCheckUpRegInfo遞歸獲取體檢登記信息:" + ex.Message);
    }
}
#endregion

57.將字符串轉為int，否則返回默認值

/// <summary>
/// 將字符串轉為int，否則返回默認值
/// </summary>
/// <param name="values"></param>
/// <returns></returns>
public static int[] ToIntArray(this string[] values)
{
    int len = values.Length;
    var indexIds = new int[len];
    for (int i = 0; i < len; i++)
    {
        indexIds[i] = values[i].ToInt(0);
    }
    return indexIds;
}

58.EF 中必須 AsEnumerable() 之后才能group by

1).IQueryable 有諸多限制, 只支持數據庫查詢語法, 無法支持 Linq to object 的操作.

2).加了 AsEnumerable() 后運行正常, 因為 IEnumerable 支持 Linq to object 的操作.

簡述Linq中.ToList(), .AsEnumerable(), AsQueryable()的區別和用法

LINQ語句中的.AsEnumerable() 和 .AsQueryable()的區別

/// <summary>
/// 分組查詢
/// </summary>
/// <typeparam name="S"></typeparam>
/// <typeparam name="T"></typeparam>
/// <param name="request"></param>
/// <param name="whereAndOrderBy"></param>
/// <returns></returns>
public virtual BaseResponse<IList<T>> GroupQuery<S, T>(BaseRequest request, Func<IEnumerable<S>, IEnumerable<S>> whereAndOrderBy) where S : class
{
    BaseResponse<IList<T>> response = new BaseResponse<IList<T>>();
    //Mapper.CreateMap<S, T>();
    var q = from m in unitOfWork.GetRepository<S>().dbSet.AsEnumerable() select m;

    if (whereAndOrderBy != null)
    {
        q = whereAndOrderBy(q);
    }
    //創建一個參數c
    ParameterExpression param =
        Expression.Parameter(typeof(S), "c");
    //c.IsDeleted=="false"
    Expression left = Expression.Property(param,
        typeof(S).GetProperty("IsDeleted"));
    Expression right = Expression.Constant(false);
    Expression filter = Expression.Equal(left, right);

    Expression pred = Expression.Lambda(filter, param);
    //Where(c=>c.IsDeleted==false)
    //Expression expr = Expression.Call(typeof(Queryable), "Where",
    //    new Type[] { typeof(S) },
    //    Expression.Constant(q), pred);
    //生成動態查詢
    //q = q.Provider.CreateQuery<S>(expr);
    q = q.AsQueryable().Where((Expression<Func<S, bool>>)pred);

    response.RecordsCount = q.Count();
    List<S> list = null;
    if (request != null && request.PageSize > 0)
    {
        list = q.Skip((request.CurrentPage - 1) * request.PageSize).Take(request.PageSize).ToList();
        response.PagesCount = GetPagesCount(request.PageSize, response.RecordsCount);
    }
    else
    {
        list = q.ToList();
    }

    //response.Data = Mapper.Map<IList<T>>(list);
    response.Data = Mapper.DynamicMap<IList<T>>(list);
    return response;
}

59.EF 傳實體，不能更新，需要先根據某個條件查詢實體，然后再把傳過來的值賦上，就可以更新實體。

60.實現一個條記錄里面兩個值要成對出現

思路:分別查出兩個結果集，進行union(MySQL 里面用union),然后在根據主鍵ID分組，having count(Id)= 2，根據時間降序。

方法一 Linq 實現

var idlist = (from p in result
  group p by p.ExaminationID into h
  select new
  {
      key = h.Key,
      count = h.Count(),
      examDate = h.FirstOrDefault().ExaminationTime
  } into c
  where c.count == 2 
  orderby c.examDate descending
  select c).Select(t => t.key).Take(7).ToList();

對應mysql 語句表示

SELECT * result
GROUP BY ExaminationID 
HAVING COUNT(ExaminationID ) = 2
ORDER BY ExaminationTime DESC
LIMIT 7

方法二

var rest = (from height in resultHeight
  join weight in resultWeight
  on height.ExaminationID  equals weight.ExaminationID  
  select new
  {
      ExaminationTime = height.ExaminationTime,
      CheckValueHeight = height.CheckValue,
      CheckValueWeight = weight.CheckValue,
  }).OrderByDescending(t => t.ExaminationTime).Take(7).ToList()

61.C# 正則匹配字符中整個url

string str="網址為http://test.com/?key=123123 ,祝您生活愉快";
Regex re = new Regex("(https?|ftp|file)://[-A-Za-z0-9+&@#/%?=~_|!:,.;]+[-A-Za-z0-9+&@#/%=~_|]");
MatchCollection mc = re.Matches(str);
var url = "";
foreach (Match m in mc)
{
url = m.ToString();
}

62.監控網站，可以監控EF生成的sql dynatrace

63.asp.net webapi 集成swagger 自動生成webapi文檔

64.C#上傳圖片重新命名圖片，防止重名。

65.篩選結果成對出現

1).linq

var list = (from item in testDataList
        where new List<string>() { "101", "102" }.Contains(item.TestCode)
        group item by item.testID
into temp
        select new
        {
            key = temp.Key,
            count = temp.Count()
        }
into c
        where c.count == 2
        select c).ToList();

2).sql

SELECT COUNT(*),testCode,Value,Exid 
FROM CM_test WHERE testCode IN('101','102')
GROUP BY Exid 
HAVING COUNT(*) = 2

66.C#int類型相乘

 Math.Round((decimal)singeTotal / (decimal)totalResult * (decimal)100.0, 2)

67. /分割並去除空值

//分割並去除空值
"1,2,13,4,5,,".Split(new string[] { "," }, StringSplitOptions.RemoveEmptyEntries);

68.Visual Studio 2017 單元測試運行不了的解決辦法

將測試項目的引用 Microsoft.VisualStudio.TestPlatform.TestFramework、Microsoft.VisualStudio.TestPlatform.TestFramework.Extensions 刪掉
添加 Microsoft.VisualStudio.QualityTools.UnitTestFramework(通過Nuget添加) 既可

69.添加Debug測試

#if !DEBUG //不是debug模式
                var account = CurrentAccount;
                if (account!=null)
                {
                    return account.ID;
                }
                return  -1;
#else //是debug模式
                return 6378;
#endif

70.使用redis 實現Session["checkCode"] 的功能,參考不用session的驗證碼。登錄實現圖片驗證碼功能為例

ValidateCode.cs:

/// <summary>
/// 驗證碼
/// </summary>
public static class ValidateCode
{
    #region 生成驗證碼
    /// <summary>
    /// 生成驗證碼
    /// </summary>
    /// <param name="length">指定驗證碼的長度</param>
    /// <returns>驗證碼</returns>
    public static string[] CreateValidateNumber(int length)
    {
        string Vchar = "1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,p" +

        ",q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,P,Q" +
        ",R,S,T,U,V,W,X,Y,Z";

        string[] VcArray = Vchar.Split(new Char[] { ',' });//拆分成數組
        string[] num = new string[length];

        int temp = -1;//記錄上次隨機數值，盡量避避免生產幾個一樣的隨機數

        Random rand = new Random();

        //采用一個簡單的算法以保證生成隨機數的不同
        for (int i = 1; i < length + 1; i++)
        {

            if (temp != -1)
            {

                rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
            }
            int t = rand.Next(VcArray.Length - 1);
            if (temp != -1 && temp == t)
            {
                return CreateValidateNumber(length);
            }

            temp = t;
            num[i - 1] = VcArray[t];
        }
        return num;
    }
    #endregion

    #region 生成圖片驗證碼
    /// <summary>
    /// 生成圖片驗證碼
    /// </summary>
    /// <param name="checkCode"></param>
    public static string CreateCheckCodeImage(string[] checkCode)
    {
        if (checkCode == null || checkCode.Length <= 0)
            return null;
        Bitmap image = new Bitmap((int)Math.Ceiling((checkCode.Length * 32.5)), 60);
        Graphics g = Graphics.FromImage(image);
        try
        {
            //生成隨機生成器
            Random random = new Random();

            //清空圖片背景色
            g.Clear(Color.White);

            //定義顏色
            Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };

            //畫圖片的背景噪音線
            for (int i = 0; i < 25; i++)
            {
                int cindex = random.Next(7);
                int findex = random.Next(5);
                int x1 = random.Next(image.Width);
                int x2 = random.Next(image.Width);
                int y1 = random.Next(image.Height);
                int y2 = random.Next(image.Height);
            }
            //定義字體
            string[] f = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋體" };

            for (int k = 0; k <= checkCode.Length - 1; k++)
            {
                int cindex = random.Next(7);
                int findex = random.Next(5);
                Font drawFont = new Font(f[findex], 26, (System.Drawing.FontStyle.Bold));
                SolidBrush drawBrush = new SolidBrush(c[cindex]);
                float x = 5.0F;
                float y = 0.0F;
                float width = 42.0F;
                float height = 48.0F;
                int sjx = random.Next(10);
                int sjy = random.Next(image.Height - (int)height);

                RectangleF drawRect = new RectangleF(x + sjx + (k * 25), y + sjy, width, height);
                StringFormat drawFormat = new StringFormat();
                drawFormat.Alignment = StringAlignment.Center;
                g.DrawString(checkCode[k], drawFont, drawBrush, drawRect, drawFormat);
            }
            //畫圖片的前景噪音點
            for (int i = 0; i < 500; i++)
            {
                int x = random.Next(image.Width);
                int y = random.Next(image.Height);
                image.SetPixel(x, y, Color.FromArgb(random.Next()));
            }

            int cindex1 = random.Next(7);

            //畫圖片的邊框線
            g.DrawRectangle(new Pen(c[cindex1]), 0, 0, image.Width - 1, image.Height - 1);
            MemoryStream ms = new MemoryStream();
            image.Save(ms, ImageFormat.Jpeg);
            //return ms.ToArray();
            // 圖片到byte[]再到base64string的轉換：
            string base64pic = "data:image/jpeg;base64,"+ Convert.ToBase64String(ms.ToArray());
            return base64pic;
        }
        finally
        {
            g.Dispose();
            image.Dispose();
        }
    }
    #endregion
}

驗證碼

控制器的代碼：

#region 隨機生成sessionid
/// <summary>
/// 隨機生成sessionid
/// </summary>
private string sessionId
{
    get
    {
        return "__sessionName__" + Guid.NewGuid().ToString();
    }
}
#endregion

#region 登錄頁面
/// <summary>
/// 登錄頁面
/// </summary>
/// <returns></returns>
public ActionResult Login()
{
    ViewBag.sessionid = sessionId;//傳到頁面，放在隱藏域里面
    return View();
}
#endregion

#region 生成驗證碼
/// <summary>
/// 生成驗證碼
/// </summary>
/// <param name="sessionid">隨機的編碼</param>
/// <returns></returns>
[HttpGet]
public JsonResult CheckCode(string sessionid)
{
    //生成驗證碼
    string[] str = ValidateCode.CreateValidateNumber(4);
    string strcode = string.Empty;
    for (int i = 0; i < str.Length; i++)
    {
        strcode += str[i];
    }
    string base64Pic = ValidateCode.CreateCheckCodeImage(str);
    RedisHelper redisHelper = new RedisHelper();
    if (redisHelper.IsConnected() && !String.IsNullOrEmpty(sessionid))
    {
        redisHelper.StringSet(sessionid, strcode, new TimeSpan(0, 10, 0));//有效期10分鍾
    }
    return Json(base64Pic, JsonRequestBehavior.AllowGet);
}
#endregion

#region 登錄 
/// <summary>
/// 登錄
/// </summary>
/// <param name="name">用戶名</param>
/// <param name="pwd">密碼</param>
/// <param name="isRemember">是否記住用戶名</param>
/// <param name="verifycode">驗證碼</param>
/// <returns></returns>
[HttpPost]
public ActionResult Login(string name, string pwd, string verifycode, string sessionid)
{

    string redisCheckCode = string.Empty;
    RedisHelper redisHelper = new RedisHelper();
    if (redisHelper.IsConnected() && !string.IsNullOrEmpty(sessionid))
    {
        redisCheckCode = redisHelper.StringGet(sessionid);
    }
    !string.IsNullOrEmpty(redisCheckCode) && verifycode.ToUpper() == redisCheckCode.ToUpper()
                
    }
    #endregion

控制器

Html：

<div id="verifycodeWrapper" class="mgt20">
    <input maxlength="4" id="txtVerifycode" type="text" class="input-code" name="verifycode" placeholder="驗證碼" required="required" />
    <img id="imgCode" alt="單擊可刷新" style="height:35px;" onclick="ChangeCode()" />
</div>
<input type="hidden" id="sessionid" name="sessionid" value="@ViewBag.sessionid">

JS:

//單擊重新改變驗證碼
function ChangeCode() {
var seid = '@ViewBag.sessionid';
$.ajax({
    url: "/Home/CheckCode",
    type: "get",
    dataType: "json",
    contentType: "application/json",
    data: { sessionid: seid},
    success: function (data) {
        if (data) {
            var img = document.getElementById("imgCode");
            img.setAttribute("src", data);
        }
    }
});
}

$(document).ready(function () {
  setTimeout(ChangeCode(),5000);
});

71. web api 自動生成文檔

1).swagger集成。

2). apidoc，參考：http://apidocjs.com/#install http://apidoc.tools/#docs

先安裝 node-v8.11.2-x64.msi

npm install apidoc -g

apidoc -i controllers -o dest 具體如下:

72. ORM 框架 sqlsugar

js 模板框架 arttemplate

前端 sui.js

73.WebAPI防篡改簽名驗證抽象基類Attribute

/// <summary>  
    /// WebAPI防篡改簽名驗證抽象基類Attribute  
    /// </summary>  
    public class AuthenticationAttribute : ActionFilterAttribute
    {
        //獲取Asp.Net對應的Request  
        /// <summary>  
        /// Occurs before the action method is invoked.  
        /// </summary>  
        /// <param name="actionContext">The action context</param>  
        public override void OnActionExecuting(HttpActionContext actionContext)
        {
            //Referer請求頭驗證

            if(actionContext.Request==null || actionContext.Request.Headers==null || actionContext.Request.Headers.Referrer == null || string.IsNullOrWhiteSpace(actionContext.Request.Headers.Referrer.ToString()))
            {
                actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.Unauthorized, "非法調用");
                return;
            }
            var Referer = ConfigurationManager.AppSettings["Referer"];
            if (string.IsNullOrWhiteSpace(Referer))
            {
                return;
            }
            var flag = false;
            var list = Referer.Split(';');
            foreach (var item in list)
            {
                if (actionContext.Request.Headers.Referrer.ToString().Contains(item))
                {
                    flag = true;
                    break;
                }
            }
            if (!flag)
            {
                actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.Unauthorized, "非法調用");
            }

        }


    }

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        config.Filters.Add(new AuthenticationAttribute());
    }
}

AuthenticationAttribute

2).

public class DExceptionFilterAttribute : ExceptionFilterAttribute
{
    public override void OnException(HttpActionExecutedContext context)
    {
        //可以記錄一些日志  
        string fLog = context.Exception.StackTrace;
        DateTime EndTime = DateTime.Now;
        LogHelper.WriteError(string.Format("{0}調用出錯結束時間:{1:yyyy-MM-dd HH:mm:ss:fff};\r\n出錯的URL:<{2}>;\r\n報出的錯誤：{3}",context.Request.RequestUri.PathAndQuery,EndTime, context.Request.RequestUri.ToString(), fLog));

        Action act = () => ErrorLogHelper.AddErrorLog(context, null, null);
        act.BeginInvoke(ar => act.EndInvoke(ar), null);
        
        context.Response = new HttpResponseMessage(HttpStatusCode.OK);
        context.Response.Content = new StringContent(JsonConvert.SerializeObject(new HISResponse() { Status = -1}));
    }
}
public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        //加入異常過濾器,統一集中處理異常報錯和異常日志記錄,系統異常時統一返回的結果
        config.Filters.Add(new DExceptionFilterAttribute());
    }
}

DExceptionFilterAttribute

74.C#啟動線程的幾種方法

什么線程有幾種啟動方式，怎么優化sql語句，

Mvc頁面生命周期

結構和類的區別，結構的作用

數據庫的優化

.net core與mvc區別，有哪些優缺點

MVC 過濾器

75.linq 兩個基礎數據成對出現

linst.Where(p => && CodeList.Contains(p.Code))
.OrderByDescending(p => p.TestDate)
.GroupBy(x => new { x.TestID, x.TestDate })
.Select(g => new
{
   TestID = g.Key.TestID,
   TestDate = g.Key.TestDate,
   Count = g.Count()
}).Where(g => g.Count == 2).OrderByDescending(p => p.TestDate).Take(30).ToList()

76. C# 將字符串轉為int，否則返回默認值

/// <summary>
/// 將字符串轉為int，否則返回默認值 var ids = request.Data.HealthTypeIDs.Split(',').ToIntArray();
/// </summary>
/// <param name="values"></param>
/// <returns></returns>
public static int[] ToIntArray(this string[] values)
{
    int len = values.Length;
    var indexIds = new int[len];
    for (int i = 0; i < len; i++)
    {
        indexIds[i] = values[i].ToInt(0);
    }
    return indexIds;
}

77.List<int> 的結果集，除了用循環，怎么轉為List<string>的結果集

int[] id = new int[] { 1, 2, 3, 4, 5, 6, 7 };
var ids = id.ToList();
List<string> ArryIds = new List<string>();
ArryIds = ids.ConvertAll<string>(x => x.ToString());
或

ArryIds = new List<string>(ids.Select(x => x.ToString()));

1.List<string> 轉 List<int>
var strList = new List<string>{"1","2","3"};
var intList = strList.Select<string,int>(x =>Convert.ToInt32(x));

2.List<string> 轉 List<long>
var strList = new List<string>{"1","2","3"};
var longList = strList.Select<string,long>(x =>Convert.ToInt64(x));

78.優化查詢，可以用SQL把結果集查出來（toList()),然后在分組(GroupBy)

79.C# switch case 的優化方式

#region 1的性別轉換2的性別
/// <summary>
/// 1性別轉換2的性別
/// </summary>
/// <param name="sex">性別 (0:男,1女)</param>
/// <returns></returns>
private string SexTGender(int? sex)
{
    //性別[1:男,2:女,0:未知的性別,9:未說明的性別]
    string gender = "9";
    if (sex.HasValue)
    {
        switch (sex.Value)
        {
            case 0:
                gender = "1";
                break;
            case 1:
                gender = "2";
                break;
        }
    }
    return gender;
}
#endregion

調用如下：

var person = new PersonModel();
MemberModel request = new MemberModel();
person.Gender = SexTGender(request.sex);

可以使用反射來改造

#region 實體轉換
/// <summary>
/// 實體轉換
/// </summary>
/// <typeparam name="T">目標實體</typeparam>
/// <typeparam name="S">源實體</typeparam>
/// <param name="t">目標實體</param>
/// <param name="s">源實體</param>
/// <param name="tfiled">目標具體實體字段</param>
/// <param name="sfield">源具體實體字段</param>
/// <param name="dic">字典項</param>
public static void mapToField<T, S>(T t, S s, string tfiled, string sfield, Dictionary<string, string> dic)
{
    var tt = typeof(T);
    var tf = tt.GetProperty(tfiled);
    var ts = typeof(S);
    var sf = ts.GetProperty(sfield);
    var v = sf.GetValue(s).ToString();
    var n_v = dic.Where(a => a.Key == v).FirstOrDefault().Value;
    tf.SetValue(t, n_v);
}
#endregion

調用，這樣實現的方式不用每次轉換都要寫一個方法

var person = new PersonModel();
MemberModel request = new MemberModel();
Dictionary<string, string> dic = new Dictionary<string, string>();
if (request.sex.HasValue)
{
    //key 性別 (0:男,1女)
    //value 性別[1:男,2:女,0:未知的性別,9:未說明的性別]
    dic.Add("0", "1");
    dic.Add("1", "2");
    mapToField<PersonModel, MemberModel>(person, request, "Gender", "sex", dic);
}

80.C# unity https://www.cnblogs.com/chenyucong/p/6272600.html

81.C# 實現redis 分布式鎖 ,另外的實現：https://www.oddity.cn/6190714.html

https://www.php.cn/redis/436811.html

需要引入Redlock.CSharp.dll 和RedLock.dll

public class RedlockHelper
{
    public void Lock(Action<bool> action, string val, string key = "IdNo")
    {
        Redlock.CSharp.Redlock dlm = new Redlock.CSharp.Redlock(RedisConnectionHelp.Instance);
        Lock lockObject;
        string resourceName = string.Format("Redlock_{0}_{1}", key, val);
        var locked = dlm.Lock(resourceName, new TimeSpan(0, 0, 10), out lockObject);
        try
        {
            action.Invoke(locked);
        }
        finally
        {
            if (lockObject != null)
                dlm.Unlock(lockObject);
        }

    }
}

調用：

new RedlockHelper().Lock((locked) =>
{
    if (locked)
    {
        ID = obj.addTest();
    }
});

82.sql server 通過創建存儲過程，生成表對應的model

1).創建一個類別表

CREATE TABLE [dbo].[Catalogue](
    [CatalogueId] [int] IDENTITY(1,1) NOT NULL,
    [Name] [nvarchar](126) NOT NULL,
    [Description] [varchar](256) NULL,
    [ParentCatalogueId] [int] NOT NULL,
    [CreatedTime] [datetime] NOT NULL,
    [ModifiedTime] [datetime] NOT NULL,
    [IsDeleted] [bit] NOT NULL,
PRIMARY KEY CLUSTERED 
(
    [CatalogueId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

ALTER TABLE [dbo].[Catalogue] ADD  DEFAULT (NULL) FOR [Description]
GO

ALTER TABLE [dbo].[Catalogue] ADD  DEFAULT ('0') FOR [ParentCatalogueId]
GO

ALTER TABLE [dbo].[Catalogue] ADD  DEFAULT ('0') FOR [IsDeleted]
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'類別Id' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Catalogue', @level2type=N'COLUMN',@level2name=N'CatalogueId'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'類別名稱' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Catalogue', @level2type=N'COLUMN',@level2name=N'Name'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'描述' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Catalogue', @level2type=N'COLUMN',@level2name=N'Description'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'父類別ID' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Catalogue', @level2type=N'COLUMN',@level2name=N'ParentCatalogueId'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'創建時間' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Catalogue', @level2type=N'COLUMN',@level2name=N'CreatedTime'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'修改時間' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Catalogue', @level2type=N'COLUMN',@level2name=N'ModifiedTime'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'是否刪除,0:否,1:是' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Catalogue', @level2type=N'COLUMN',@level2name=N'IsDeleted'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'產品類別' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Catalogue'
GO

2).創建存儲過程

=============================================
--表結構生成model
-- =============================================
CREATE PROCEDURE [dbo].[Sys_ViewModel]
@TableName nvarchar(64),
@KeyWord nvarchar(64)
AS
BEGIN
 SELECT  CASE WHEN col.colorder = 1 THEN obj.name ELSE @TableName END AS 表名,
    '/// <summary>' as lie1,
    '///'+CONVERT(nvarchar(50), ISNULL(ep.[value], '')) as lie2,
    '/// </summary>'as lie3,
    ' public ' +  CASE WHEN t.name = 'bigint' THEN 'int'
     WHEN t.name = 'nvarchar' THEN 'string'
              WHEN t.name = 'int' THEN 'int'
     WHEN t.name = 'bit' THEN 'bool'
     WHEN t.name='datetime' THEN 'DateTime'
     WHEN t.name='tinyint' THEN 'int'
     else t.name
             END +' '+col.name +' { get; set; }' as lie4
into #Temp
FROM    dbo.syscolumns col
        LEFT  JOIN dbo.systypes t ON col.xtype = t.xusertype
        inner JOIN dbo.sysobjects obj ON col.id = obj.id
                                         AND obj.xtype = 'U'
                                         AND obj.status >= 0
        LEFT  JOIN dbo.syscomments comm ON col.cdefault = comm.id
        LEFT  JOIN sys.extended_properties ep ON col.id = ep.major_id
                                                      AND col.colid = ep.minor_id
                                                      AND ep.name = 'MS_Description'
        LEFT  JOIN sys.extended_properties epTwo ON obj.id = epTwo.major_id
                                                         AND epTwo.minor_id = 0
                                                         AND epTwo.name = 'MS_Description'
WHERE   obj.name = @TableName--表名 
AND col.name LIKE '%'+@KeyWord+'%'
ORDER BY col.colorder ;

declare @lie0 nvarchar(50),
 @lie1 nvarchar(50),
 @lie2 nvarchar(50),
 @lie3 nvarchar(50),
 @lie4 nvarchar(50)

declare mycursor cursor for  
select* from #Temp
open mycursor
 while 1=1
 begin
   fetch next from mycursor into @lie0,@lie1,@lie2,@lie3,@lie4
   if @@fetch_status <>0 
   break
   print @lie1+char(10)+@lie2+char(10)+@lie3+char(10)+@lie4+char(13);
 end
 close mycursor;
 deallocate mycursor;

END

3). 調用存儲過程

exec Sys_ViewModel 'Catalogue',''

83.get set 的理解：https://www.jb51.net/article/37960.htm

84. 站點目錄下怎么指定favicon.ico圖標， <link rel="icon" href="~/favicontest1.ico">

85. 詳解C#中==、Equals、ReferenceEquals的區別

86. var where = new StringBuilder(30, 30 * itemId.Length); //設置合適的初始長度，可以顯著提高效率（避免了多次內存申請）

87. 使用C#實現字符串反轉算法，例如：輸入"12345", 輸出"54321"

public static string Reverse(string str)
{
    if (string.IsNullOrEmpty(str))
    {
        throw new ArgumentException("參數不合法");
    }

    StringBuilder sb = new StringBuilder(str.Length);  //注意：設置合適的初始長度，可以顯著提高效率（避免了多次內存申請）
    for (int index = str.Length - 1; index >= 0; index--)
    {
        sb.Append(str[index]);
    }
    return sb.ToString();
}
public static string Reverse(string str)
{
    if (string.IsNullOrEmpty(str))
    {
        throw new ArgumentException("參數不合法");
    }
    char[] chars = str.ToCharArray();
    int begin = 0;
    int end = chars.Length - 1;
    char tempChar;
    while (begin < end)
    {
        tempChar = chars[begin];
        chars[begin] = chars[end];
        chars[end] = tempChar;
        begin++;
        end--;
    }
    string strResult = new string(chars);
    return strResult;
}
還有一個比較簡單也挺有效的方法：

public static string Reverse(string str)
{
    char[] arr = str.ToCharArray();
    Array.Reverse(arr);
    return new string(arr);
}

88. 布式id生成器: https://juejin.im/post/5d8882d8f265da03e369c063 https://www.cnblogs.com/shiningrise/p/5727895.html

89.C# 獲取時間戳參考：https://www.cnblogs.com/rainman/p/4810043.html

public static int ToTimeStamp(this DateTime time)
{
    DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
    var result = (int)(time - startTime).TotalSeconds;
    return result;
}

public static long ToJavascriptTimestamp(this DateTime input)
{
    var reuslt =  ((input - new DateTime(1970, 1, 1, 0, 0, 0, 0)).Ticks / 10000); //毫秒
    return reuslt;
}

var currentTime = DateTime.Now;//2019/10/8 16:17:15
var result1 = DateTimeExtend.ToTimeStamp(currentTime);//1570522635
var result2 = DateTimeExtend.ToJavascriptTimestamp(currentTime);//1570551435012

對比js

var currentTime = new Date('2019/10/8 16:17:15');
var result1 =  Date.parse(currentTime);//1570522635000
var result2 = currentTime.valueOf();//1570522635000
var result3 = currentTime.getTime();//1570522635000

90.AutoMapper和EmitMapper

91.full join isnull

92.IQueryable 是在把篩選的條件都轉為SQL語句在數據庫查詢時直接篩選。
IEnumerable 是在數據庫中把整張表查出來保存在內存中，再進行篩選。

參考：https://blog.csdn.net/qq_43146253/article/details/88123610

93.C# linq 匿名類型（IQueryable）轉為DaTable

public static class IQueryableExtend
{
    public static DataTable ToDataTable<T>(this IQueryable<T> varlist)
    {
        //定義要返回的DataTable對象
        DataTable dtReturn = new DataTable();
        // 保存列集合的屬性信息數組
        PropertyInfo[] oProps = null;
        if (varlist == null) return dtReturn;//安全性檢查
        //循環遍歷集合，使用反射獲取類型的屬性信息
        foreach (T rec in varlist)
        {
            //使用反射獲取T類型的屬性信息，返回一個PropertyInfo類型的集合
            if (oProps == null)
            {
                oProps = ((Type)rec.GetType()).GetProperties();
                //循環PropertyInfo數組
                foreach (PropertyInfo pi in oProps)
                {
                    Type colType = pi.PropertyType;//得到屬性的類型
                    //如果屬性為泛型類型
                    if ((colType.IsGenericType) && (colType.GetGenericTypeDefinition()
                    == typeof(Nullable<>)))
                    {   //獲取泛型類型的參數
                        colType = colType.GetGenericArguments()[0];
                    }
                    //將類型的屬性名稱與屬性類型作為DataTable的列數據
                    dtReturn.Columns.Add(new DataColumn(pi.Name, colType));
                }
            }
            //新建一個用於添加到DataTable中的DataRow對象
            DataRow dr = dtReturn.NewRow();
            //循環遍歷屬性集合
            foreach (PropertyInfo pi in oProps)
            {   //為DataRow中的指定列賦值
                dr[pi.Name] = pi.GetValue(rec, null) == null ?
                    DBNull.Value : pi.GetValue(rec, null);
            }
            //將具有結果值的DataRow添加到DataTable集合中
            dtReturn.Rows.Add(dr);
        }
        return dtReturn;//返回DataTable對象
    }
}

IQueryableToDataTable

調用方：

using (DBEntities db = new DBEntities())
{
    var query = from tes in db.Test
                select new
                {
                    testNo = tes.testNo,
                    Name = tes.Name,
                    testDate = tes.testDate,
                };
    if (!string.IsNullOrWhiteSpace(dto.UserID))
    {
        query = query.Where(t => t.UserID == dto.UserID);
    }
    query = query.OrderBy(t => t.testDate);

    return query.ToDataTable();
}

94. C# 集合類有哪些是線程安全的，哪些不是線程安全的？

ArryList此類型的公共靜態成員是線程安全的。但不保證所有實例成員都是線程安全的。
Hashtable 是線程安全的，可供多個讀取器線程和單個寫入線程使用。
List<T> : 此類型的公共靜態成員是線程安全的。但不保證所有實例成員都是線程安全的
Dictionary<TKey,TValue>:只要沒有修改集合，Dictionary<TKey,TValue> 就可以同時支持多個讀取器。盡管如此，枚舉集合本身並不是一個線程安全的過程。在具有寫入訪問的枚舉競爭的罕見情況下，必須在整個枚舉過程中鎖定集合。若要允許多個線程訪問集合以進行讀寫操作，則必須實現自己的同步。

https://docs.microsoft.com/zh-cn/dotnet/standard/collections/thread-safe/

95.前端js 調用后台web api 顯示圖片驗證碼

[HttpGet]
public FileResult VerifyCode()
{   
    byte[] vr = null;
    return new FileContentResult(vr, "image/png");
}
                
var url = 'VerifyCode';
var xmlhttp;
xmlhttp = new XMLHttpRequest();
xmlhttp.open("get", url, true);
xmlhttp.responseType = "blob";
xmlhttp.setRequestHeader("Content-Type", "application/json");
xmlhttp.onload = function () {
    if (this.status == 200) {
        var blob = this.response;
        var img = document.getElementById("imgCode");
        img.onload = function (e) {
              window.URL.revokeObjectURL(img.src);
        };
        img.src = window.URL.createObjectURL(blob);
    }
}
xmlhttp.send();

方法一

//圖片到byte[]再到base64string的轉換：
[HttpGet]
public JsonResult CheckCode()
{
    string base64pic = "data:image/jpeg;base64,"+ Convert.ToBase64String(ms.ToArray());//為二進制字節流
    return Json(base64Pic, JsonRequestBehavior.AllowGet);
}

$.ajax({
    url: "CheckCode",
    type: "get",
    dataType: "json",
    contentType: "application/json",
    success: function (data) {
        if (data) {
            var img = document.getElementById("imgCode");
            img.setAttribute("src", data);
        }
    }
});

方法二

96.前端js 調用后台url return "test.aspx?r=" + (new Date()).getTime();

97.http下 Chrome瀏覽器無權限調用攝像頭麥克風的解決方法：https://www.xfei.me/index.php?c=article&id=159

98.對話框彈出事件

shown.bs.modal事件要先於頁面值的綁定,反之show.bs.modal

具體參考：https://v3.bootcss.com/javascript/#popovers

99.http下 Chrome瀏覽器無權限調用攝像頭麥克風的解決方法

"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --unsafely-treat-insecure-origin-as-secure="http://test.com:49581" --user-data-dir=C:\tmp

99. asp.net mvc 和 asp.net web api 下載文件流（這里以視頻舉例）

asp.net web api(.net framework支持，.net core 不支持):
#region 視頻查看
/// <summary>
/// 視頻查看
/// </summary>
/// <param name="no">請求參數</param>
/// <returns></returns>
[Route("~/Video/{no}")]
[HttpGet]
public HttpResponseMessage DownloadVideo(string no)
{
    HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
    byte[] vedio = null;//自己獲取二進制字節流

    if (vedio == null)
    {
        result.Content = new StringContent("沒有相關的視頻記錄！");
        return result;
    }

    result.Content = new ByteArrayContent(vedio);
    result.Content.Headers.ContentType = new MediaTypeHeaderValue("video/mp4");
    //result.Content.Headers.Add("Content-Disposition", $"attachment;filename=\"{ Guid.NewGuid().ToString("N") }.mp4\"");
    result.Headers.CacheControl = new CacheControlHeaderValue();
    result.Headers.CacheControl.Public = true;
    result.Headers.CacheControl.MaxAge = TimeSpan.FromSeconds(120);
    result.Content.Headers.Expires = DateTimeOffset.Now.AddSeconds(120);
    return result;
}
#endregion

asp.net mvc(.net framework和.net core 都支持):

#region 打開視頻
/// <summary>
/// 打開視頻
/// </summary>
/// <param name="no">請求參數</param>
/// <returns></returns>
[HttpGet]
[Route("~/Video")]
public ActionResult GetVideo([FromQuery] string no)
{
    byte[] files = null;
    if (string.IsNullOrEmpty(recordNo))
    {
        ContentResult result = new ContentResult();
        result.Content = "請求參數不能為空";
        return result;
    }
    else
    {
        byte[] files = null;//自己獲取二進制字節流
    }
    if (files == null || files.Length == 0)
    {
        ContentResult result = new ContentResult();
        result.Content = "沒有相關的視頻記錄";
        return result;
    }
    return File(files.ToArray(), "video/mpeg4", $"{Guid.NewGuid().ToString("N")}.mp4");
}
#endregion

#region 下載
/// <summary>
/// 下載資源
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static byte[] DownloadData(string url)
{
    try
    {
        var client = new WebClient();
        var byteData = client.DownloadData(url);
        return byteData;
    }
    catch
    {
        return null;
    }
}
/// <summary>
/// 下載資源
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public static async Task<byte[]> DownloadFile(string url)
{
    using (var client = new HttpClient())
    {
        var uri = new Uri(url);
        byte[] urlContents = await client.GetByteArrayAsync(uri);
        return urlContents;
    }
}
#endregion

頁面打開視頻需要給src賦值，關閉的時候要把src值清空

<div id="video" class="easyui-dialog" title="視頻播放" style="width:700px;height:750px;overflow: hidden;"
     data-options="resizable:false,closed:true,modal:true,onClose:function(){  $('#video video').prop('src', ''); }">
    <video src="" autoplay controls="controls" width="100%" height="100%" poster="~/Content/images/loading.gif" style="background:black;"></video>
    <h1 style="display:none; margin-top: 100px; width: 100%; text-align: center;font-size:20px;">未找到相應的視頻資源</h1>
</div>

function playVideo(channelId) {
    var url = '/Common/JumpWlyy?url=' + '/Video/' + Id;
    $("#video").children().hide().filter("video").show();
    $("#video video").prop("src", url);
    $('#video').window('open'); 
}

100.批量修改圖片名稱，去掉文件名中的中文字符

/// <summary>
/// 批量修改文件名"001測試.jpg"(去掉測試),調用ModifyFileName("D:\\pictor");
/// </summary>
/// <param name="path">文件夾zhi路徑</param>
private void ModifyFileName(string path)
{
    string chineseStr = "[\u4e00-\u9fa5]";//中文正則
    foreach (string childPath in Directory.GetDirectories(path))
    {
        ModifyFileName(childPath);
    }

    foreach (var childPath in Directory.GetFiles(path))
    {
        string fileName = Path.GetFileName(childPath);
        //匹配字符串中包含中文字符的正則表達式
        if (!string.IsNullOrEmpty(fileName) && Regex.IsMatch(fileName, chineseStr)
        {
            string newFileName = Regex.Replace(fileName, chineseStr, "");
            string newPath = Path.GetDirectoryName(childPath) + "\\" + newFileName;
            System.IO.File.Move(childPath, newPath);
        }
    }
}

101.

var id = 1;
using (DBEntities db = new DBEntities())
{
var test1 = db.Tests.Where(x => x.id == id && !x.IsDel);
var test2 = db.Tests.Where(x => x.id == id && x.IsDel == false);//推薦使用這個寫法
}
解析：test2的寫法要好些
test1 生成對應的sql select * from Tests where id = 1 and IsDel <> 1 //該表給IsDel建了索引，會導致索引失效
test2 生成對應的sql select * from Tests where id = 1 and IsDel = 0 ////該表給IsDel建了索引，索引能起到作用

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