C# Log4Net实现日志文件

一、创建一个WinForm的项目，并通过NuGet安装log4net。

 

二、创建LogHelper类以及log4net.config配置文件。

 

三、编写相关代码。

1、log4net.config类

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
    </configSections>
    <log4net>
        <root>
        </root>
        <appender name="InfoAppender" type="log4net.Appender.RollingFileAppender,log4net" >
            <param name="File" type="" value="Log/Error/" />
            <param name="AppendToFile" value="true" />
            <param name="RollingStyle" value="Date" />
            <param name="DatePattern" value="yyyyMMdd&quot;.ini&quot;" />
            <param name="StaticLogFileName" value="false" />
            <layout type="log4net.Layout.PatternLayout,log4net">
                <param name="ConversionPattern" value="[%d]%n%m%n" />
            </layout>
        </appender>    
        <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
            <bufferSize value="0" />
            <connectionType value="System.Data.SQLite.SQLiteConnection,System.Data.SQLite" />
            <connectionString value="Data Source=DataBase\\Log4NetSQLite.db;Version=3;" />
            <commandText value="INSERT INTO Log (Date, Level, Logger, Message) VALUES (@Date, @Level, @Logger, @Message)" />
            <parameter>
                <parameterName value="@Date" />
                <dbType value="DateTime" />
                <layout type="log4net.Layout.RawTimeStampLayout" />
            </parameter>
            <parameter>
                <parameterName value="@Level" />
                <dbType value="String" />
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%level" />
                </layout>
            </parameter>
            <parameter>
                <parameterName value="@Logger" />
                <dbType value="String" />
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%logger" />
                </layout>
            </parameter>
            <parameter>
                <parameterName value="@Message" />
                <dbType value="String" />
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%message" />
                </layout>
            </parameter>
        </appender>        
        <logger name="Error">
            <level value="ERROR" />
            <appender-ref ref="InfoAppender" />
        </logger>
        <logger name="Info">
            <level value="INFO" />
            <appender-ref ref="AdoNetAppender" />
        </logger>
    </log4net>
</configuration>

 

2.LogHelper类

 

public class LogHelper
    {
        /// <summary>
        /// 普通日志
        /// </summary>
        /// <param name="message">日志内容</param>
        public static void Info(string message)
        {
            ILog log = LogManager.GetLogger("Info");
            if (log.IsInfoEnabled)
            {
                log.Info(message);
            }
        }
        /// <summary>
        /// 错误日志带异常
        /// </summary>
        /// <param name="message">错误日志</param>
        public static void Error(string message, Exception ex)
        {
            ILog log = LogManager.GetLogger("Error");
            if (log.IsErrorEnabled)
            {
                log.Error(message, ex);
            }
        }

        /// <summary>
        /// 错误日志不带异常
        /// </summary>
        /// <param name="message">错误日志</param>
        public static void Error(string message)
        {
            ILog log = LogManager.GetLogger("Error");
            if (log.IsErrorEnabled)
            {
                log.Error(message);
            }
        }
    }

3、将log4net.config设为始终复制。

 

 

四、在AssemblyInfo.cs添加以下代码

[assembly: AssemblyTitle("Log4NetSQLiteFuniyi")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("Log4NetSQLiteFuniyi")]
[assembly: AssemblyCopyright("Copyright ©  2021")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config", ConfigFileExtension = "config", Watch = true)]

// 将 ComVisible 设置为 false 会使此程序集中的类型
//对 COM 组件不可见。如果需要从 COM 访问此程序集中的类型
//请将此类型的 ComVisible 特性设置为 true。
[assembly: ComVisible(false)]

// 如果此项目向 COM 公开，则下列 GUID 用于类型库的 ID
[assembly: Guid("4fea8622-fd5b-4aca-a2dd-96f2c5c74e4c")]

// 程序集的版本信息由下列四个值组成: 
//
//      主版本
//      次版本
//      生成号
//      修订号
//
//可以指定所有这些值，也可以使用“生成号”和“修订号”的默认值
//通过使用 "*"，如下所示:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]

 

五、添加测试代码并运行

 

 

    public partial class FrmMain : Form
    {
        public FrmMain()
        {
            InitializeComponent();
        }

        private void btn_ini_Click(object sender, EventArgs e)
        {
            this.lab_ini.Text = "";
            //不带异常
            LogHelper.Error(this.txt_ini.Text.Trim());
            //带异常
            LogHelper.Error(this.txt_ini.Text.Trim(), new Exception("这是一条异常错误信息"));
            this.lab_ini.Text = "写入完成";
        }

        private void btn_SQLite_Click(object sender, EventArgs e)
        {
          
        }
    }