精简易用的log4net使用

log4net是不错的组件，但如果长时间不用，之前研究通透的东西就忘记了。重要的日志会另外做，但只是想快速的让自己的程序记录一些出错信息等， log4net是不错的选择，关键是能精简和易用。

下面记录log4net快速稳定的使用方法：

1.项目引用log4net.dll

2.App.config中加入配置信息

上图1区，configSectios只能放在最前边，不然会报错，它只能成为第一个子节项。2区是配置项，可以默认就好。

3.代码，

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

using log4net;
using log4net.Config;

namespace TestLog4net
{
    public static partial class Log
    {
        /// <summary>
        /// 日志类
        /// </summary>
        private static ILog clientLog;

        /// <summary>
        /// 初始化
        /// </summary>
        static Log()
        {
            XmlConfigurator.Configure();
            if (clientLog == null)
                clientLog = LogManager.GetLogger(typeof(Log));
        }

        /// <summary>
        /// 写普通信息
        /// </summary>
        /// <param name="msg">消息</param>
        public static void WriteInfo(string msg)
        {
            clientLog.Info(msg);
        }

        /// <summary>
        /// 写调试信息
        /// </summary>
        /// <param name="msg">消息</param>
        public static void WriteDebug(string msg)
        {
            clientLog.Debug(msg);
        }

        /// <summary>
        /// 写错误信息
        /// </summary>
        /// <param name="msg">消息</param>
        /// <param name="ex">异常</param>
        public static void WriteError(string msg, Exception ex)
        {
            clientLog.Error(msg, ex);
        }

        /// <summary>
        /// 写错误信息
        /// </summary>
        public static void WriteError(string msg)
        {
            clientLog.Error(msg);
        }

        /// <summary>
        /// 写Warn信息
        /// </summary>
        public static void WriteWarn(string msg)
        {
            clientLog.Warn(msg);
        }
    }
}

4.调用方法，很简单，静态类不用初始化什么的，直接用就行。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using log4net;
using log4net.Config;

namespace TestLog4net
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Log.WriteDebug("my debug");
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Log.WriteInfo("info test");
        }

        private void button3_Click(object sender, EventArgs e)
        {
            try
            {
                throw(new Exception("Error:length=0 test"));
            }
            catch (Exception ex)
            {
                Log.WriteError("demo of error", ex);
            }
        }
    }
}