日志接口響應時間，記錄接口請求信息，響應結果以及響應時間等。可以清楚的分析和了解接口狀態。
如果一個一個地在接口下面做日志，那不是我們想要的結果。所以，我們選擇做一個特性來控制接口要不要記錄請求響應日志。
關鍵代碼如下：
public class LogRequestAndResponseAttribute: ActionFilterAttribute
{
private static string RequestLogSwitch = string.IsNullOrEmpty(ConfigurationSettings.AppSettings["RequestLogSwitch"])?"0": ConfigurationSettings.AppSettings["RequestLogSwitch"];//請求日志開關
/// <summary>
/// 重寫請求開始
/// </summary>
/// <param name="actionContext"></param>
public override void OnActionExecuting(HttpActionContext actionContext)
{
if(RequestLogSwitch.Trim()!="0")
{
try
{
RequestRecord item = new RequestRecord();
string reqArguments = string.Empty;//請求參數
if (actionContext.Request.Method.Method == "GET")
{
reqArguments = actionContext.Request.RequestUri.Query;
}
else if (actionContext.Request.Method.Method == "POST")
{
reqArguments =(actionContext.ActionArguments!=null&& actionContext.ActionArguments.Count > 0) ? actionContext.ActionArguments.JSONSerializeV3() : string.Empty;
}
item.RequestId = actionContext.Request.GetCorrelationId();//請求唯一標識
item.Type = 0;
item.BaseUrl = actionContext.Request.RequestUri.AbsolutePath;//請求地址
item.RequestMethod = actionContext.Request.Method.Method;//請求方式
item.ReqArguments = reqArguments;
item.BeginRequestTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff");
string jsonStr = item.JSONSerializeV3();
var path = @"{0}Log\LogRequest\{1}\log.txt".FormatStr(AppDomain.CurrentDomain.BaseDirectory, DateTime.Now.ToString("yyyy-MM-dd"));
StaticFunctions.WriteStringToFile(path, jsonStr, true, Encoding.UTF8);
}
catch(Exception ex) {
var path = @"{0}Log\LogRequestErr\{1}\log.txt".FormatStr(AppDomain.CurrentDomain.BaseDirectory, DateTime.Now.ToString("yyyy-MM-dd"));
StaticFunctions.WriteStringToFile(path, "{0}==>發生異常了，異常信息為：{1}\r\n,異常描述為：{2}\r\n，異常位置：{3}\r\n".FormatStr(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), ex.Message, ex.InnerException.Message, ex.StackTrace), true, Encoding.UTF8);
}
}
base.OnActionExecuting(actionContext);
}
/// <summary>
/// 重寫請求結束
/// </summary>
/// <param name="actionExecutedContext"></param>
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
if (RequestLogSwitch.Trim() != "0")
{
string jsonStr = string.Empty;
try
{
RequestRecord item = new RequestRecord();
item.Type = 1;
item.RequestId = actionExecutedContext.Request.GetCorrelationId();
item.EndRequestTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff");
item.ResponseCode = actionExecutedContext.Response.StatusCode.GetInt();
jsonStr = item.JSONSerializeV3();
var path = @"{0}Log\LogRequest\{1}\log.txt".FormatStr(AppDomain.CurrentDomain.BaseDirectory, DateTime.Now.ToString("yyyy-MM-dd"));
StaticFunctions.WriteStringToFile(path, jsonStr, true, Encoding.UTF8);
}
catch(Exception ex)
{
var path = @"{0}Log\LogRequestErr\{1}\log.txt".FormatStr(AppDomain.CurrentDomain.BaseDirectory, DateTime.Now.ToString("yyyy-MM-dd"));
StaticFunctions.WriteStringToFile(path, "{0}==>發生異常了，異常信息為：{1}\r\n,異常描述為：{2}\r\n，異常位置：{3}\r\n".FormatStr(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"),ex.Message,ex.InnerException.Message,ex.StackTrace), true, Encoding.UTF8);
}
}
base.OnActionExecuted(actionExecutedContext);
}
}