1、首先在项目中添加Nuget程序包...
2、然后在NuGet窗体中搜索Log4Net，然后点击安装<安装过程可能会持续几分钟，请耐心等待>
3、在项目中添加一个Config文件，如已有App.config，则直接在其中添加内容：
截图中配置的XML代码如下：
<
log4net
>
<
logger
name
="logerror"
>
<
level
value
="ERROR"
/>
<
appender-ref
ref
="ErrorAppender"
/>
</
logger
>
<
logger
name
="loginfo"
>
<
level
value
="INFO"
/>
<
appender-ref
ref
="InfoAppender"
/>
</
logger
>
<
appender
name
="ErrorAppender"
type
="log4net.Appender.RollingFileAppender"
>
<
param
name
="File"
value
="Log\LogError\"
/>
<
param
name
="AppendToFile"
value
="true"
/>
<
param
name
="MaxSizeRollBackups"
value
="100"
/>
<
param
name
="MaxFileSize"
value
="10240"
/>
<
param
name
="StaticLogFileName"
value
="false"
/>
<
param
name
="DatePattern"
value
="yyyyMMdd".txt""
/>
<
param
name
="RollingStyle"
value
="Date"
/>
<
layout
type
="log4net.Layout.PatternLayout"
>
<
param
name
="ConversionPattern"
value
="%n异常时间：%d %n异常级别：%-5p%n异常内容：%m%n"
/>
</
layout
>
<!--
< > = <> %n = 回车
-->
</
appender
>
<
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".txt""
/>
<
param
name
="RollingStyle"
value
="Date"
/>
<
layout
type
="log4net.Layout.PatternLayout"
>
<
param
name
="ConversionPattern"
value
="日志时间：%d %n日志级别：%-5p %n日志内容：%m%n%n"
/>
</
layout
>
</
appender
>
</
log4net
>
最后在项目的 AssemblyInfo.cs 文件中注册Config文件，如下：
//为项目注册Log4Net.config配置文件
[assembly: log4net.Config.XmlConfigurator(ConfigFileExtension = "config", Watch = true)]
最后，添加日志类：
public
class
LogHelper
{
private
LogHelper()
{
}
public
static
readonly log4net.ILog loginfo = log4net.LogManager.GetLogger("loginfo");
publicstaticreadonly log4net.ILog logerror = log4net.LogManager.GetLogger("logerror");
publicstaticvoid SetConfig()
{
log4net.Config.XmlConfigurator.Configure();
}
publicstaticvoid SetConfig(FileInfo configFile)
{
log4net.Config.XmlConfigurator.Configure(configFile);
}
publicstaticvoid WriteLog(string info)
{
if (loginfo.IsInfoEnabled)
{
loginfo.Info(info);
}
}
publicstaticvoid WriteLog(string info, Exception se)
{
if (logerror.IsErrorEnabled)
{
logerror.Error(info, se);
}
}
}
好了，到了这里，准备工作也就完成了，下面我们就开始测试下吧
日志文件默认记录在根目录下，在config中可以更改路径
原文：https://www.cnblogs.com/Liyuting/p/8417757.html
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