現在FrameWork2.0以上使用的是：ConfigurationManager或WebConfigurationManager。並且AppSettings屬性是只讀的，並不支持修改屬性值．
一、如何使用ConfigurationManager？
1、添加引用：添加System.configguration
2、引用空間
3、config配置文件配置節
常用配置節：
（1）普通配置節
<appSettings>
<add key="COM1" value="COM1,9600,8,None,1,已啟用" />
</appSettings>
（2）數據源配置節
<connectionStrings>
<add name="kyd" connectionString="server=.;database=UFDATA_999_2017;user=sa;pwd=123"/>
</connectionStrings>
（3）自定義配置節
二、config文件讀寫
1、依據連接串名字connectionName返回數據連接字符串
//依據連接串名字connectionName返回數據連接字符串 public static string GetConnectionStringsConfig(string connectionName) { //指定config文件讀取 string file = System.Windows.Forms.Application.ExecutablePath; System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(file); string connectionString = config.ConnectionStrings.ConnectionStrings[connectionName].ConnectionString.ToString(); return connectionString; }
2、更新連接字符串
///<summary> ///更新連接字符串 ///</summary> ///<param name="newName">連接字符串名稱</param> ///<param name="newConString">連接字符串內容</param> ///<param name="newProviderName">數據提供程序名稱</param> public static void UpdateConnectionStringsConfig(string newName, string newConString, string newProviderName) { //指定config文件讀取 string file = System.Windows.Forms.Application.ExecutablePath; Configuration config = ConfigurationManager.OpenExeConfiguration(file); bool exist = false; //記錄該連接串是否已經存在 //如果要更改的連接串已經存在 if (config.ConnectionStrings.ConnectionStrings[newName] != null) { exist = true; } // 如果連接串已存在，首先刪除它 if (exist) { config.ConnectionStrings.ConnectionStrings.Remove(newName); } //新建一個連接字符串實例 ConnectionStringSettings mySettings = new ConnectionStringSettings(newName, newConString, newProviderName); // 將新的連接串添加到配置文件中. config.ConnectionStrings.ConnectionStrings.Add(mySettings); // 保存對配置文件所作的更改 config.Save(ConfigurationSaveMode.Modified); // 強制重新載入配置文件的ConnectionStrings配置節 ConfigurationManager.RefreshSection("connectionStrings"); }
3、返回*.exe.config文件中appSettings配置節的value項
///<summary> ///返回*.exe.config文件中appSettings配置節的value項 ///</summary> ///<param name="strKey"></param> ///<returns></returns> public static string GetAppConfig(string strKey) { string file = System.Windows.Forms.Application.ExecutablePath; Configuration config = ConfigurationManager.OpenExeConfiguration(file); foreach (string key in config.AppSettings.Settings.AllKeys) { if (key == strKey) { return config.AppSettings.Settings[strKey].Value.ToString(); } } return null; }
4、在*.exe.config文件中appSettings配置節增加一對鍵值對
///<summary> ///在*.exe.config文件中appSettings配置節增加一對鍵值對 ///</summary> ///<param name="newKey"></param> ///<param name="newValue"></param> public static void UpdateAppConfig(string newKey, string newValue) { string file = System.Windows.Forms.Application.ExecutablePath; Configuration config = ConfigurationManager.OpenExeConfiguration(file); bool exist = false; foreach (string key in config.AppSettings.Settings.AllKeys) { if (key == newKey) { exist = true; } } if (exist) { config.AppSettings.Settings.Remove(newKey); } config.AppSettings.Settings.Add(newKey, newValue); config.Save(ConfigurationSaveMode.Modified); ConfigurationManager.RefreshSection("appSettings"); }
5、修改IP地址
// 修改system.serviceModel下所有服務終結點的IP地址 public static void UpdateServiceModelConfig(string configPath, string serverIP) { Configuration config = ConfigurationManager.OpenExeConfiguration(configPath); ConfigurationSectionGroup sec = config.SectionGroups["system.serviceModel"]; ServiceModelSectionGroup serviceModelSectionGroup = sec as ServiceModelSectionGroup; ClientSection clientSection = serviceModelSectionGroup.Client; foreach (ChannelEndpointElement item in clientSection.Endpoints) { string pattern = @"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b"; string address = item.Address.ToString(); string replacement = string.Format("{0}", serverIP); address = Regex.Replace(address, pattern, replacement); item.Address = new Uri(address); } config.Save(ConfigurationSaveMode.Modified); ConfigurationManager.RefreshSection("system.serviceModel"); } // 修改applicationSettings中App.Properties.Settings中服務的IP地址 public static void UpdateConfig(string configPath, string serverIP) { Configuration config = ConfigurationManager.OpenExeConfiguration(configPath); ConfigurationSectionGroup sec = config.SectionGroups["applicationSettings"]; ConfigurationSection configSection = sec.Sections["DataService.Properties.Settings"]; ClientSettingsSection clientSettingsSection = configSection as ClientSettingsSection; if (clientSettingsSection != null) { SettingElement element1 = clientSettingsSection.Settings.Get("DataService_SystemManagerWS_SystemManagerWS"); if (element1 != null) { clientSettingsSection.Settings.Remove(element1); string oldValue = element1.Value.ValueXml.InnerXml; element1.Value.ValueXml.InnerXml = GetNewIP(oldValue, serverIP); clientSettingsSection.Settings.Add(element1); } SettingElement element2 = clientSettingsSection.Settings.Get("DataService_EquipManagerWS_EquipManagerWS"); if (element2 != null) { clientSettingsSection.Settings.Remove(element2); string oldValue = element2.Value.ValueXml.InnerXml; element2.Value.ValueXml.InnerXml = GetNewIP(oldValue, serverIP); clientSettingsSection.Settings.Add(element2); } } config.Save(ConfigurationSaveMode.Modified); ConfigurationManager.RefreshSection("applicationSettings"); } private static string GetNewIP(string oldValue, string serverIP) { string pattern = @"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b"; string replacement = string.Format("{0}", serverIP); string newvalue = Regex.Replace(oldValue, pattern, replacement); return newvalue; }
config 讀寫方法
using System.Configuration; //省略其他代碼 public SalesOrderData() { string str = ""; str = ConfigurationManager.ConnectionStrings["kyd"].ToString(); conn = new SqlConnection(str); cmd = conn.CreateCommand(); }
實際應用：
1、獲取配置節的值
button1 點擊獲取配置節<appSettings>指定key的value值
button2 點擊獲取配置節<connectionStrings>指定name的connectionString值
結果為：
2、修改配置節的值
button1 點擊獲取配置節<appSettings>指定key的value值
button2 點擊修改配置節<connectionStrings>指定key的value值為文本框的值
button3 點擊獲取配置節<appSettings>指定key新的value值
結果為：
此時配置文件key1的value值為，獲取key值仍為修改前的值
如何重置為修改前的值？
如何保存修改后的值？
