WinForm中如何使用Log4net

一、引用log4net.dll网上找一个即可

二、新建一个log4net的配置文件，log4net.cfg.xml，属性：内容，总是拷贝 很重要否则编译后不会创建Log File

<?xml version="1.0" encoding="utf-8" ?>
<log4net>
  <appender name="rollingFile_App" type="log4net.Appender.RollingFileAppender,log4net" >

    <param name="File" value="Logs\CPBMP_WinForm" />
    <param name="AppendToFile" value="true" />
    <param name="RollingStyle" value="Date" />
    <param name="DatePattern" value=".yyyy.MM.dd.'log'" />
    <param name="StaticLogFileName" value="false" />

    <layout type="log4net.Layout.PatternLayout,log4net">
      <param name="ConversionPattern" value="%d [%t] %-5p %c [%x] <%X{auth}> - %m%n" />
    </layout>
  </appender>

  <!--<root>
    --><!--如果只需要看看Sql设置INFO就够了，如果你要调试可以设置为DEBUG或ALL--><!--
    <priority value="INFO" />
    <appender-ref ref="rollingFile_SQL" />
  </root>-->

  <logger name="CPBMP_WinForm">
    <level value="Debug" />
    <appender-ref ref="rollingFile_App" />
  </logger>
  
</log4net>

三、新建一类

using System;
using System.Collections.Generic;
using System.Text;
using log4net;

namespace CPBMP_WinForm
{
    public sealed class NewLogManager
    {
        //Pre-defined logger name in web.config or app.config
        public const string LoggerName = "CPBMP_WinForm";        
        public const int EmptyFunctionKey = -1;
        public const int AnonymouseUserKey = -1;
        public static readonly ILog Logger = log4net.LogManager.GetLogger(LoggerName);

        /// <summary>
        /// Add a error log
        /// </summary>
        /// <param name="errorMessage"></param>
        public static void AddError(string errorMessage)
        {
            Logger.Error(errorMessage);
        }

        /// <summary>
        /// Add a error log with an exception
        /// </summary>
        /// <param name="errorMessage"></param>
        /// <param name="ex"></param>
        public static void AddError(string errorMessage, Exception ex)
        {
            Logger.Error(errorMessage + System.Environment.NewLine + ex.Message + System.Environment.NewLine + ex.ToString());
        }

        /// <summary>
        /// Add a warning log
        /// </summary>
        /// <param name="warnMessage"></param>
        public static void AddWarn(string warnMessage)
        {
            Logger.Warn(warnMessage);
        }

        /// <summary>
        /// Add a warning log with an exception
        /// </summary>
        /// <param name="warnMessage"></param>
        /// <param name="ex"></param>
        public static void AddWarn(string warnMessage, Exception ex)
        {
            Logger.Warn(warnMessage + System.Environment.NewLine + ex.Message + System.Environment.NewLine + ex.ToString());
        }

        /// <summary>
        /// Add a info log
        /// </summary>
        /// <param name="infoMessage"></param>
        public static void AddInfo(string infoMessage)
        {
            Logger.Info(infoMessage);
        }

        /// <summary>
        /// Add a info log with an exception
        /// </summary>
        /// <param name="infoMessage"></param>
        /// <param name="ex"></param>
        public static void AddInfo(string infoMessage, Exception ex)
        {
            Logger.Info(infoMessage + System.Environment.NewLine + ex.Message + System.Environment.NewLine + ex.ToString());
        }

        /// <summary>
        /// Add a debug log
        /// </summary>
        /// <param name="debugMessage"></param>
        public static void AddDebug(string debugMessage)
        {
            Logger.Debug(debugMessage);
        }

        /// <summary>
        /// Add a debug log with an exception
        /// </summary>
        /// <param name="debugMessage"></param>
        /// <param name="ex"></param>
        public static void AddDebug(string debugMessage, Exception ex)
        {
            Logger.Debug(debugMessage + System.Environment.NewLine + ex.Message + System.Environment.NewLine + ex.ToString());
        }

        /// <summary>
        /// Add a database error log 
        /// </summary>
        /// <param name="objectName">table or view name</param>
        /// <param name="dbAction">either retrieve, update, delete</param>
        /// <param name="ex"></param>
        public static void AddDatabaseError(string objectName, DatabaseAction dbAction, Exception ex)
        {
            string logMessage = string.Empty;
            switch ( dbAction )
            {
                case DatabaseAction.Select:
                    logMessage = "Error occurred when retrieve data from table " + objectName;
                    break;
                case DatabaseAction.Insert:
                    logMessage = "Error occurred when insert data to table " + objectName;
                    break;
                case DatabaseAction.Update:
                    logMessage = "Error occurred when update data to table " + objectName;
                    break;
                case DatabaseAction.Delete:
                    logMessage = "Error occurred when delete data from table " + objectName;
                    break;
            }

            AddError(logMessage, ex);
        }    
    }

    /// <summary>
    /// Enumeration for database action type
    /// </summary>
    public enum DatabaseAction
    {
        Select,
        Insert,
        Update,
        Delete
    }

   
}

四、重要一步，启动时加载配置文件，并写Log

FileInfo file = new FileInfo(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "log4net.cfg.xml"));
            log4net.Config.XmlConfigurator.Configure(file);
            NewLogManager.AddInfo("Application is starting...");