Log4net配置方式

Web应用程序配置log4net（添加Log4net.dll）:

1,修改web.config

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

<!--
  有关如何配置 ASP.NET 应用程序的详细消息，请访问
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
  </configSections>
  <log4net>
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender" >
      <file value="log.txt"/>
      <appendToFile value="true"/>
      <maxSizeRollBackups value="10"/>
      <maximumFileSize value="1024KB"/>
      <rollingStyle value="Size"/>
      <staticLogFileName value="true"/>

      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%ndc] - %message%newline" />
      </layout>
    </appender>
    <root>
      <level value="DEBUG" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>
  </log4net>
  <system.web>
    <compilation debug="true" targetFramework="4.0" />
  </system.web>
</configuration>

 2,在全局文件中添加：

protected void Application_Start(object sender, EventArgs e)
{
　　log4net.Config.XmlConfigurator.Configure();
}

3,应用：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using log4net;
using System.Net;

namespace Log4netTest
{
    public partial class WebForm1 : System.Web.UI.Page
    {
         private static ILog log = LogManager.GetLogger(typeof(WebForm1));
        protected void Page_Load(object sender, EventArgs e)
        {
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            //ILog log = LogManager.GetLogger(typeof(WebForm1));
            log.Debug("我擦啊！！！！！！！");
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            log.Warn("警告一下哦！！");
        }

        protected void Button3_Click(object sender, EventArgs e)
        {

            WebClient wc = new WebClient();
            string data="";
            //可处理的异常用try catch，未处理的异常在全局文件中捕获。
            try
            {
               data=  wc.DownloadString("http://www.youtube.com");
                Response.Write("<font color=red>内容是：</font>"+data);
            }
            catch (Exception ex)
            {
                log.Error(ex.Message);
                Response.Write("打开失败啊！");
            }
           
        }
    }
}

4,处理未捕获到的异常（未try的）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.SessionState;
using log4net;

namespace Log4netTest
{
    public class Global : System.Web.HttpApplication
    {
        private static ILog log = LogManager.GetLogger(typeof(Global));
        protected void Application_Start(object sender, EventArgs e)
        {
            log4net.Config.XmlConfigurator.Configure();
        }

        protected void Session_Start(object sender, EventArgs e)
        {

        }

        protected void Application_BeginRequest(object sender, EventArgs e)
        {

        }

        protected void Application_AuthenticateRequest(object sender, EventArgs e)
        {

        }

        protected void Application_Error(object sender, EventArgs e)
        {
            //在这里处理未捕获的异常
            log.Error("发生未处理异常！",HttpContext.Current.Error);
        }

        protected void Session_End(object sender, EventArgs e)
        {

        }

        protected void Application_End(object sender, EventArgs e)
        {

        }
    }
}