如何在VS2010下使用Log4Net

log4net has a known issue of referencing a System.Web component which is not part of the .NET Framework 4 Client Profile and the VS2010 by default sets project target to be the lightweighted Client Profile. The solution is to change the target to .NET Framework 4:

Right click project -> properties -> Application. Change:

 

.

NET 

Framework 

 

4 

 

Client 

 

Profile 

  

to be:

 

.

NET 

Framework 

 

4 

  

... and that should work, i.e. you can use log4net again...

来自：http://stackoverflow.com/questions/1767253/log4net-with-net-4-0

 范例：

App.config

 

<? xml   version = "1.0" ?>
< configuration >
  < configSections >
    < section   name = "log4net"   type ="log4net.Config.Log4NetConfigurationSectionHandler,
 log4net-net-1.0" />
  </ configSections >
  < log4net >
    < root >
      < level   value = "ALL"   />
      < appender-ref   ref = "LogFileAppender"   />
    </ root >
    < appender   name = "LogFileAppender"   type = "log4net.Appender.FileAppender"   >
      < param   name = "File"   value = "log-file.txt"   />
      < param   name = "AppendToFile"   value = "true"   />
      < layout   type = "log4net.Layout.PatternLayout" >
        < param   name = "ConversionPattern"   value = "%d [%t] %-5p %c [%x] <%X{auth}>%n - %m%n"   />
      </ layout >
    </ appender >
  </ log4net >
  < startup >
    < supportedRuntime   version = "v4.0"   sku = ".NETFramework,Version=v4.0" />
  </ startup >
</ configuration >

注意：configSections节点和startup节点的顺序，否则只见文件而无法输出日志

AssemblyInfo.cs中添加

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

.cs代码正常使用

log4net.ILog log = log4net.LogManager.GetLogger( "MyLogger" );
log.Debug("test" );
原文地址：http://blog.csdn.net/Maths_bai/archive/2010/12/13/6074337.aspx