Log4net 记录日志

配置文件

备注，需要放到根目录下面

<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<log4net>
<!--定义输出到文件中-->
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<!--定义文件存放位置-->
<file value="log\\"/>
<appendToFile value="true"/>
<rollingStyle value="Date"/>
<datePattern value="yyyy\\yyyyMM\\yyyyMMdd'.txt'"/>
<staticLogFileName value="false"/>
<param name="MaxSizeRollBackups" value="100"/>
<layout type="log4net.Layout.PatternLayout">
<!--每条日志末尾的文字说明-->
<!--输出格式-->
<!--样例：2008-03-26 13:42:32,111 [10] INFO  Log4NetDemo.MainClass [(null)] - info-->
<conversionPattern value="%newline %n记录时间：%date %n线程ID:[%thread] %n日志级别：  %-5level %n出错类：%logger property: [%property{NDC}] - %n错误描述：%message%newline %n"/>
</layout>
</appender>
<root>
<level value="ERROR"/>
<!--文件形式记录日志-->
<appender-ref ref="RollingLogFileAppender"/>
</root>
</log4net>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>
</configuration>

　　日志类：

public class WriteLog
{
/// <summary>
/// 输出日志到Log4Net
/// </summary>
/// <param name="t"></param>
/// <param name="ex"></param>
#region static void WriteErrorLog(Type t, Exception ex)

public static void WriteErrorLog(Type t, Exception ex)
{
log4net.ILog log = log4net.LogManager.GetLogger(t);
log.Error("Error", ex);
}

#endregion

/// <summary>
/// 输出日志到Log4Net
/// </summary>
/// <param name="t"></param>
/// <param name="msg"></param>
#region static void WriteErrorLog(Type t, string msg)

public static void WriteErrorLog(Type t, string msg)
{
log4net.ILog log = log4net.LogManager.GetLogger(t);
log.Error(msg);
}

#endregion
}

　　测试调用：

static void Main(string[] args)
{
string a = "aa";
try
{
int i = int.Parse(a);
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
WriteLog.WriteErrorLog(typeof(Program), ex);

}

}

　　备注：如果出现日志无法记录问题，则

//配置log4net
[assembly: log4net.Config.XmlConfigurator(Watch = true)]

在程序的 assembly.cs 里加上 上面这句话