C#中使用Log4net日志输出到本地文件、Textbox或Listview

网上很多配置log4net的方法,但是排行靠前的 根本就没有说明清除,导致浪费了两个小时来搞清楚如何配置,真是无语,特写此文,给那些刚接触log4net的朋友

1、参考链接：http://blog.sina.com.cn/s/blog_642e41c201014pml.html

此方法是直接将配置文件配置在app.config

<configSections>
    <!--在配置选项中加入log4net的引用-->
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>
  <log4net>
    <appender  name="LogFile" type="log4net.Appender.RollingFileAppender,log4net" >
      <param name="File" value="../../logs/log.txt" /> <!--定义用文件来保存日志，生成的文件log.txt放在logs目录中，logs文件夹和应用程序生成的bin文件夹在同一目录下。-->
      <param name="AppendToFile" value="false" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="yyyy.MM.dd" />
      <param name="StaticLogFileName" value="true" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <!--定义输出风格-->
        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />
        <param name="Header" value="  ----------------------header--------------------------  " />
        <param name="Footer" value="  ----------------------footer--------------------------  " />
      </layout>
    </appender>
    <appender>
      <!--一个配置文件可以有很多appender,一个appender节就相当于一个日志输出介质或方法。-->
    </appender>
    <logger name="logApp">
      <!--定义logger对象的名字为logApp,以方便在代码中使用logger-->
        <!--配置项可以不配置-->
        <level value="ALL" />
        <!--定义输出的信息等级为所有其中包括Fatal.Error.Warn.Info.Debug-->
      </logger>
      <root>
        <!--定义日志输出的方式和等级-->
        <level value="INFO" />
        <appender-ref ref="LogFile" /><!--选择了文件输出，注意粗体部分对应的名称-->
      </root>
    </log4net>  

　　第二种方式就是单独将配置文件配置在log4net.config中,网上大多数都是这种方法,但是却没有说明关键的一步

　　参考链接：http://www.cnblogs.com/zfanlong1314/p/3662679.html

　　1. 新建一个配置文件,log4net.config配置方法同成web.config或app.config一致;

　　2.如果windows应用程序请把配置文件设为:复制到输出目录 修改方法:在log4net.config上右击-->属性--->把"复制到输出目录" 值改为true;

　　3.在要用到log4的地方命名空间上边加上:[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config", Watch = true)]

2、输出到自定义Textbox日志输出

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using log4net.Appender;
using System.Windows.Forms;
using log4net.Core;
using log4net.Layout;  

namespace log4myself
{
    /// <summary>
    /// Usage:
    ///     log4net.Config.BasicConfigurator.Configure();
    ///     var logPattern = "%date [%thread] %-5level %logger !%M - %message%newline";
    ///     var logAppender = new TextBoxBaseAppender()
    ///     {
    ///         TextBox = this.textBox2,
    ///         Layout = new PatternLayout(logPattern)
    ///     };
    ///
    ///     ((log4net.Repository.Hierarchy.Hierarchy)log4net.LogManager.GetLoggerRepository()).Root.AddAppender(logAppender);
    /// </summary>
    public class TextBoxBaseAppender : AppenderSkeleton
    {
        public TextBoxBase TextBox { get; set; }  

        public TextBoxBaseAppender()
        {
        }  

        protected override void Append(LoggingEvent loggingEvent)
        {
            if (this.TextBox == null)
            {
                return;
            }  

            if (!this.TextBox.IsHandleCreated)
            {
                return;
            }  

            if (this.TextBox.IsDisposed)
            {
                return;
            }  

            var patternLayout = this.Layout as PatternLayout;  

            var str = string.Empty;
            if (patternLayout != null)
            {
                str = patternLayout.Format(loggingEvent);  

                if (loggingEvent.ExceptionObject != null)
                {
                    str += loggingEvent.ExceptionObject.ToString() + Environment.NewLine;
                }
            }
            else
            {
                str = loggingEvent.LoggerName + "-" + loggingEvent.RenderedMessage + Environment.NewLine;
            }  

            if (!this.TextBox.InvokeRequired)
            {
                printf(str);
            }
            else
            {
                this.TextBox.BeginInvoke((MethodInvoker)delegate
                {
                    if (!this.TextBox.IsHandleCreated)
                    {
                        return;
                    }  

                    if (this.TextBox.IsDisposed)
                    {
                        return;
                    }
                    printf(str);
                });
            }
        }  

        private void printf(string str)
        {
            //若是超过10行 则清楚
            if (TextBox.Lines.Length > )
            {
                TextBox.Clear();
            }
            this.TextBox.AppendText(str);
        }
    }
}  

　　在Form中使用的时候的代码为：

//读取配置文件的信息
log1 = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);  

//设置textbox打印日志
var logPattern = "%d{yyyy-MM-dd HH:mm:ss} --%-5p-- %m%n";
var textBox_logAppender = new TextBoxBaseAppender()
{
    TextBox = this.textBox1,//注释后 就只有文件log
    Layout = new PatternLayout(logPattern)
};
//相当于root标签下的   <appender-ref ref="LogFile" />
log4net.Config.BasicConfigurator.Configure(textBox_logAppender);  

3、输出到Listview代码为：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using log4net.Appender;
using System.Windows.Forms;
using log4net.Core;
using log4net.Layout;  

namespace log4myself
{
    public class ListViewBaseAppender : AppenderSkeleton
    {
        public ListView listView { get; set; }  

        public ListViewBaseAppender()
        {
        }  

        protected override void Append(LoggingEvent loggingEvent)
        {
            if (this.listView == null)
            {
                return;
            }  

            if (!this.listView.IsHandleCreated)
            {
                return;
            }  

            if (this.listView.IsDisposed)
            {
                return;
            }  

            var patternLayout = this.Layout as PatternLayout;  

            var str = string.Empty;
            if (patternLayout != null)
            {
                str = patternLayout.Format(loggingEvent);  

                if (loggingEvent.ExceptionObject != null)
                {
                    str += loggingEvent.ExceptionObject.ToString() + Environment.NewLine;
                }
            }
            else
            {
                str = loggingEvent.LoggerName + "-" + loggingEvent.RenderedMessage + Environment.NewLine;
            }  

            if (!this.listView.InvokeRequired)
            {
                printf(str);
            }
            else
            {
                this.listView.BeginInvoke((MethodInvoker)delegate
                {
                    if (!this.listView.IsHandleCreated)
                    {
                        return;
                    }  

                    if (this.listView.IsDisposed)
                    {
                        return;
                    }  

                    printf(str);
                });
            }
        }  

        private void printf(string str)
        {
            if (listView.Items.Count>)
            {
                listView.Items.Clear();
            }  

            ListViewItem item = new ListViewItem();
            item.Text = str.ToString();   

            listView.BeginUpdate();
            listView.Items.Add(item);
            listView.Items[listView.Items.Count - ].EnsureVisible();//滚动到最后
            listView.EndUpdate();
        }
    }
}  

Demo 下载：http://download.csdn.NET/detail/sc6231565/9620527

原文链接：

c# log4net 日志输出到 本地文件 textbox listview DEMO