<?xml version="1.0" encoding="utf-8"?>
<configuration>

  <system.web>
    <compilation debug="true" targetFramework="4.5.2" />
    <httpRuntime targetFramework="4.5.2" />
  </system.web>
  <!-- Level的级别，由高到低 -->
  <!-- None > Fatal > ERROR > WARN > DEBUG > INFO > ALL-->
  <!-- 解释：如果level是ERROR，则在cs文件里面调用log4net的info()方法，则不会写入到日志文件中-->
  <log4net>
    <!--错误日志类-->
    <logger name="logerror">
      <!--日志类的名字-->
      <level value="ALL" />
      <!--定义记录的日志级别-->
      <appender-ref ref="ErrorAppender" />
      <!--记录到哪个介质中去-->
    </logger>
    <!--信息日志类-->
    <logger name="loginfo">
      <level value="ALL" />
      <appender-ref ref="InfoAppender" />
    </logger>
    <!--错误日志附加介质-->
    <appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">
      <!-- name属性指定其名称,type则是log4net.Appender命名空间的一个类的名称,意思是,指定使用哪种介质-->
      <param name="File" value="Log\\LogError\\" />
      <!--日志输出到exe程序这个相对目录下-->
      <param name="AppendToFile" value="true" />
      <!--输出的日志不会覆盖以前的信息-->
      <param name="MaxSizeRollBackups" value="100" />
      <!--备份文件的个数-->
      <param name="MaxFileSize" value="10240" />
      <!--当个日志文件的最大大小-->
      <param name="StaticLogFileName" value="false" />
      <!--是否使用静态文件名-->
      <param name="DatePattern" value="yyyyMMdd&quot;.htm&quot;" />
      <!--日志文件名-->
      <param name="RollingStyle" value="Date" />
      <!--文件创建的方式，这里是以Date方式创建-->
      <!--错误日志布局-->
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="&lt;HR COLOR=red&gt;%n异常时间：%d [%t] &lt;BR&gt;%n异常级别：%-5p &lt;BR&gt;%n异 常 类：%c [%x] &lt;BR&gt;%n%m &lt;BR&gt;%n &lt;HR Size=1&gt;"  />
      </layout>
    </appender>
    <!--信息日志附加介质-->
    <appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
      <param name="File" value="Log\\LogInfo\\" />
      <param name="AppendToFile" value="true" />
      <param name="MaxFileSize" value="10240" />
      <param name="MaxSizeRollBackups" value="100" />
      <param name="StaticLogFileName" value="false" />
      <param name="DatePattern" value="yyyyMMdd&quot;.htm&quot;" />
      <param name="RollingStyle" value="Date" />
      <!--信息日志布局-->
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="&lt;HR COLOR=blue&gt;%n日志时间：%d [%t] &lt;BR&gt;%n日志级别：%-5p &lt;BR&gt;%n日 志 类：%c [%x] &lt;BR&gt;%n%m &lt;BR&gt;%n &lt;HR Size=1&gt;"  />
      </layout>
    </appender>
  </log4net>
</configuration>

[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config", ConfigFileExtension = "config", Watch = true)]

public class LogHelper
    {
        public static readonly log4net.ILog loginfo = log4net.LogManager.GetLogger("loginfo");//这里的 loginfo 和 log4net.config 里的名字要一样
        public static readonly log4net.ILog logerror = log4net.LogManager.GetLogger("logerror");//这里的 logerror 和 log4net.config 里的名字要一样
        public static void WriteLog(string info)
        {
            if (loginfo.IsInfoEnabled)
            {
                loginfo.Info(info);
            }
        }

        public static void WriteLog(string info, Exception ex)
        {
            if (logerror.IsErrorEnabled)
            {
                logerror.Error(info, ex);
            }
        }
    }

try
            {
              
               
            }
            catch (Exception ex)
            {
                LogHelper.WriteLog(System.Reflection.MethodBase.GetCurrentMethod().Name+":"+ ex.Message.ToString(), ex);
                throw;
            }

public class WebApiExceptionFilterAttribute : ExceptionFilterAttribute
    {
        //重写基类的异常处理方法
        #region
        public override void OnException(HttpActionExecutedContext actionExecutedContext)
        {
           
            //2.返回调用方具体的异常信息
            if (actionExecutedContext.Exception is NotImplementedException)
            {
                var oResponse = new HttpResponseMessage(HttpStatusCode.NotImplemented);
                //oResponse.Content = new StringContent("方法不被支持");
                oResponse.Content = new StringContent(actionExecutedContext.Exception.Message);
                oResponse.ReasonPhrase = "This Func is Not Supported";
                actionExecutedContext.Response = oResponse;
            }
            else if (actionExecutedContext.Exception is TimeoutException)
            {
                actionExecutedContext.Response = new HttpResponseMessage(HttpStatusCode.RequestTimeout);
            }
            //.....这里可以根据项目需要返回到客户端特定的状态码。如果找不到相应的异常，统一返回服务端错误500
            else
            {
                actionExecutedContext.Response = new HttpResponseMessage(HttpStatusCode.InternalServerError);
                //注释掉错误信息的展示，显示统一的错误
                var msg  = actionExecutedContext.Exception.Message+ "HttpStatusCode:" + Convert.ToInt32(HttpStatusCode.InternalServerError);
                LogHelper.WriteLog(msg);
                var oResponse = new HttpResponseMessage(HttpStatusCode.InternalServerError)
                {
                    //Content = new StringContent(actionExecutedContext.Exception.Message),
                    Content = new StringContent(msg),
                    ReasonPhrase = "Error"
                };
                actionExecutedContext.Response = oResponse;
            }

            base.OnException(actionExecutedContext);
        }
        #endregion
    }

  GlobalConfiguration.Configuration.Filters.Add(new WebApiExceptionFilterAttribute());