新建一个名为log4net.config的文件，然后把下面一段粘贴进去
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<log4net>
<!-- OFF, FATAL, ERROR, WARN, INFO, DEBUG, ALL -->
<!-- Set root logger level to ERROR and its appenders -->
<root>
<level value="ALL"/>
<appender-ref ref="SysAppender"/>
</root>
<!-- Print only messages of level DEBUG or above in the packages -->
<logger name="WebLogger">
<level value="ALL"/>
</logger>
<appender name="SysAppender" type="log4net.Appender.RollingFileAppender,log4net">
<!-- 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="Logger\"/>
<!--//日志存放位置（这里的value值是一个Logger，表示在项目文件夹中创建一个名叫Logger的文件。也可以是value="c:\log.txt"）-->
<param name="AppendToFile" value="false"/>
<!--//是否追加到文件-->
<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="RollingStyle" value="Date"/>
<!--//变换的形式为日期-->
<param name="DatePattern" value="""yyyyMMddHH".txt""/>
<!--//生成格式；每天生成一个日志-->
<param name="StaticLogFileName" value="false"/>
<!--//日志文件名，是否固定不变-->
<layout type="log4net.Layout.PatternLayout,log4net">
<!--错误日志布局-->
<!--<param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n"/>-->
<param name="ConversionPattern" value="%d [%t] [%-5p] - %m%n"/>
<!--
%m(message):输出的日志消息，如ILog.Debug(…)输出的一条消息
%n(new line):换行
%d(datetime):输出当前语句运行的时刻
%r(run time):输出程序从运行到执行到当前语句时消耗的毫秒数
%t(thread id):当前语句所在的线程ID
%p(priority): 日志的当前优先级别，即DEBUG、INFO、WARN…等
%c(class):当前日志对象的名称，例如：
%f(file):输出语句所在的文件名。
%l(line)：输出语句所在的行号。
%数字：表示该项的最小长度，如果不够，则用空格填充，如“%-5level”表示level的最小宽度是5个字符，如果实际长度不够5个字符则以空格填充。
-->
</layout>
</appender>
<!--//这种配置，是将日志写入到文本文件当中-->
</log4net>
</configuration>
添加一个名为Log4NetHelper的类
public class Log4NetHelper
{
private static readonly log4net.ILog _Logger4net = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
RichTextBox richTextBox;
static Log4NetHelper _instance;
public static Log4NetHelper Instance()
{
if (_instance == null)
{
_instance = new Log4NetHelper();
}
return _instance;
}
private Log4NetHelper()
{
string baseDirectory = AppDomain.CurrentDomain.BaseDirectory;
string path = Path.Combine(baseDirectory, "log4net.config");
XmlConfigurator.ConfigureAndWatch(new FileInfo(path));
}
public void Init(RichTextBox richTextBox)//该方法绑定需要显示日志的控件，这里绑定的是richtextbox
{
this.richTextBox = richTextBox;
}
#region [ 参数 ]
public bool IsDebugEnabled
{
get { return _Logger4net.IsDebugEnabled; }
}
public bool IsInfoEnabled
{
get { return _Logger4net.IsInfoEnabled; }
}
public bool IsWarnEnabled
{
get { return _Logger4net.IsWarnEnabled; }
}
public bool IsErrorEnabled
{
get { return _Logger4net.IsErrorEnabled; }
}
public bool IsFatalEnabled
{
get { return _Logger4net.IsFatalEnabled; }
}
#endregion
#region [ 接口方法 ]
#region [ Debug ]
public void Debugf(string format, params object[] args)
{
if (this.IsDebugEnabled)
{
this.Log(LogLevel.Debug, format, args);
}
}
public void Debugf(string format, Exception exception, params object[] args)
{
if (this.IsDebugEnabled)
{
this.Log(LogLevel.Debug, string.Format(format, args), exception);
}
}
#endregion
#region [ Info ]
public void Infof(string format, params object[] args)
{
if (this.IsInfoEnabled)
{
this.Log(LogLevel.Info, format, args);
this.PrintLog(format, LogLevel.Info);
}
}
public void Infof(string format, Exception exception, params object[] args)
{
if (this.IsInfoEnabled)
{
this.Log(LogLevel.Info, string.Format(format, args), exception);
this.PrintLog(format, LogLevel.Info);
}
}
#endregion
#region [ Warn ]
public void Warnf(string format, params object[] args)
{
if (this.IsWarnEnabled)
{
this.Log(LogLevel.Warn, format, args);
}
}
public void Warnf(string format, Exception exception, params object[] args)
{
if (this.IsWarnEnabled)
{
this.Log(LogLevel.Warn, string.Format(format, args), exception);
}
}
#endregion
#region [ Error ]
public void Errorf(string format, params object[] args)
{
if (this.IsErrorEnabled)
{
this.Log(LogLevel.Error, format, args);
this.PrintLog(format, LogLevel.Error, System.Drawing.Color.Red);
}
}
public void Errorf(string format, Exception exception, params object[] args)
{
if (this.IsErrorEnabled)
{
this.Log(LogLevel.Error, string.Format(format, args), exception);
this.PrintLog(format, LogLevel.Error, System.Drawing.Color.Red);
}
}
#endregion
#region [ Fatal ]
public void Fatalf(string format, params object[] args)
{
if (this.IsFatalEnabled)
{
this.Log(LogLevel.Fatal, format, args);
}
}
public void Fatalf(string format, Exception exception, params object[] args)
{
if (this.IsFatalEnabled)
{
this.Log(LogLevel.Fatal, string.Format(format, args), exception);
}
}
#endregion
#endregion
#region [ 内部方法 ]
/// <summary>
/// 输出普通日志
/// </summary>
/// <param name="level"></param>
/// <param name="format"></param>
/// <param name="args"></param>
private void Log(LogLevel level, string format, params object[] args)
{
switch (level)
{
case LogLevel.Debug:
_Logger4net.DebugFormat(format, args);
break;
case LogLevel.Info:
_Logger4net.InfoFormat(format, args);
break;
case LogLevel.Warn:
_Logger4net.WarnFormat(format, args);
break;
case LogLevel.Error:
_Logger4net.ErrorFormat(format, args);
break;
case LogLevel.Fatal:
_Logger4net.FatalFormat(format, args);
break;
}
}
/// <summary>
/// 格式化输出异常信息
/// </summary>
/// <param name="level"></param>
/// <param name="message"></param>
/// <param name="exception"></param>
private void Log(LogLevel level, string message, Exception exception)
{
switch (level)
{
case LogLevel.Debug:
_Logger4net.Debug(message, exception);
break;
case LogLevel.Info:
_Logger4net.Info(message, exception);
break;
case LogLevel.Warn:
_Logger4net.Warn(message, exception);
break;
case LogLevel.Error:
_Logger4net.Error(message, exception);
break;
case LogLevel.Fatal:
_Logger4net.Fatal(message, exception);
break;
}
}
private void PrintLog(string info, LogLevel level)
{
if (richTextBox != null)
{
var infoFomart = string.Format("{0}-[{1}]-{2}\r\n", DateTime.Now.ToString("yyyy-MM-dd-HH:mm:fff"), level, info);
richTextBox.BeginInvoke(new Action(() =>
{
richTextBox.AppendText(infoFomart);
}));
}
}
private void PrintLog(string info, LogLevel level, Color color)
{
if (richTextBox != null)
{
var infoFomart = string.Format("{0}-[{1}]-{2}\r\n", DateTime.Now.ToString("yyyy-MM-dd-HH:mm:fff"), level, info);
richTextBox.BeginInvoke(new Action(() =>
{
richTextBox.SelectionColor = color;
richTextBox.AppendText(infoFomart);
}));
}
}
#endregion
}
#region [ enum: LogLevel ]
/// <summary>
/// 日志级别
/// </summary>
public enum LogLevel
{
Debug,
Info,
Warn,
Error,
Fatal
}
#endregion
winform用法，绑定richtextbox
Log4NetHelper slog = Log4NetHelper.Instance();//声明对象
private void Form1_Load(object sender, EventArgs e)
{
slog.Init(this.richTextBox1);//绑定需要显示日志的控件
slog.Infof("程序加载完成");//书写日志
}
注意事项：
复制到输出目录一定要改成始终复制！！！！！！！！！！！