ASP.NET MVC Web项目中使用Log4Net记录日志，并按照日志类型分文件存储

1.创建MvcLog4Net项目

2.创建 空的MVC项目

3.项目创建完成的效果

4.选择项目，点击鼠标右键，在弹出菜单中选择“管理解决方案的 NuGet 程序包”

5.

在NuGet浏览界面：

点击“浏览”选项，输入“log4net”，在自动搜索结果中选中第一项，并勾选右侧的项目，点击“安装”按钮

6.在弹出“预览更改”界面中，点击“确定”按钮

7.安装完成后，在项目的引用中可以看到 log4net

8.

在 Global.asax 文件的 Application_Start 方法中，增加

log4net.Config.XmlConfigurator.Configure();

9.

在 Web.config 文件中的 configuration 节点下面增加（必须紧挨着configuration 节点添加）

<configSections>

<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />

</configSections>

10.

在 Web.config 文件中，添加 log4net 节点，配置日志类别：

<log4net>

<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender, log4net">

<param name="LockingModel" type="log4net.Appender.FileAppender+MinimalLock" />

<param name="File" value="Log/Log/" />

<param name="StaticLogFileName" value="false" />

<param name="DatePattern" value="yyyy-MM-dd.'log'" />

<param name="AppendToFile" value="true" />

<param name="MaxSizeRollBackups" value="-1" />

<param name="MaximumFileSize" value="20MB" />

<param name="RollingStyle" value="Date" />

<layout type="log4net.Layout.PatternLayout">

<param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n%newline" />

</layout>

</appender>

<appender name="RollingLogFileErrorAppender" type="log4net.Appender.RollingFileAppender, log4net">

<param name="LockingModel" type="log4net.Appender.FileAppender+MinimalLock" />

<param name="File" value="Log/ErrorLog/" />

<param name="StaticLogFileName" value="false" />

<param name="DatePattern" value="yyyy-MM-dd.'log'" />

<param name="AppendToFile" value="true" />

<param name="MaxSizeRollBackups" value="-1" />

<param name="MaximumFileSize" value="10MB" />

<param name="RollingStyle" value="Date" />

<layout type="log4net.Layout.PatternLayout">

<param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n%newline" />

</layout>

<filter type="log4net.Filter.LevelRangeFilter">

<levelMin value="WARN" />

<levelMax value="FATAL" />

</filter>

</appender>

<root>

<!--控制级别，由低到高: ALL|DEBUG|INFO|WARN|ERROR|FATAL|OFF-->

<!--比如定义级别为INFO，则INFO级别向下的级别，比如DEBUG日志将不会被记录-->

<!--如果没有定义LEVEL的值，则缺省为DEBUG-->

<level value="ALL" />

<appender-ref ref="RollingLogFileAppender" />

<appender-ref ref="RollingLogFileErrorAppender" />

</root>

</log4net>

11.Web.config中添加完log4net后的效果

12.在项目的 Controller 文件夹，右键添加 控制器

13.在弹出添加控制器界面，选择 “MVC控制器 - 空”

14.输入控制器名字 HomeController，点击 “添加”按钮

15.在HomeController的Index Action中右键，选择“添加视图”

16.在弹出“添加视图”界面，点击“添加”按钮

17.

在Index视图中写入测试日志：

log4net.ILog log = log4net.LogManager.GetLogger(typeof(HomeController));

log.Info("这个是 Info Level 的日志！");

log.Error("这个是 Error Level 的日志！");

18.最终日志效果

配置文件：

<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->

<configuration>
	<configSections>
		<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
	</configSections>
	<appSettings>
    <add key="webpages:Version" value="2.0.0.0" />
    <add key="webpages:Enabled" value="false" />
    <add key="PreserveLoginUrl" value="true" />
    <add key="ClientValidationEnabled" value="true" />
    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
  </appSettings>
  <system.web>

    <httpRuntime targetFramework="4.5" />

    <compilation debug="true" targetFramework="4.5" />

    <pages>
      <namespaces>
        <add namespace="System.Web.Helpers" />
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Routing" />
        <add namespace="System.Web.WebPages" />
      </namespaces>
    </pages>
  </system.web>
  <system.webServer>
    <validation validateIntegratedModeConfiguration="false" />

  <handlers>
      <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
      <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
      <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers></system.webServer>

	<log4net>
		<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender, log4net">

			<param name="LockingModel" type="log4net.Appender.FileAppender+MinimalLock" />

			<param name="File" value="Log/Log/" />

			<param name="StaticLogFileName" value="false" />

			<param name="DatePattern" value="yyyy-MM-dd.'log'" />

			<param name="AppendToFile" value="true" />

			<param name="MaxSizeRollBackups" value="-1" />

			<param name="MaximumFileSize" value="20MB" />

			<param name="RollingStyle" value="Date" />

			<layout type="log4net.Layout.PatternLayout">
				<param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n%newline" />
			</layout>
		</appender>
		<appender name="RollingLogFileErrorAppender" type="log4net.Appender.RollingFileAppender, log4net">

			<param name="LockingModel" type="log4net.Appender.FileAppender+MinimalLock" />

			<param name="File" value="Log/ErrorLog/" />

			<param name="StaticLogFileName" value="false" />

			<param name="DatePattern" value="yyyy-MM-dd.'log'" />

			<param name="AppendToFile" value="true" />

			<param name="MaxSizeRollBackups" value="-1" />

			<param name="MaximumFileSize" value="10MB" />

			<param name="RollingStyle" value="Date" />

			<layout type="log4net.Layout.PatternLayout">
				<param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n%newline" />
			</layout>

			<filter type="log4net.Filter.LevelRangeFilter">
				<levelMin value="WARN" />
				<levelMax value="FATAL" />
			</filter>
		</appender>
		<root>
			<!--控制级别，由低到高: ALL|DEBUG|INFO|WARN|ERROR|FATAL|OFF-->

			<!--比如定义级别为INFO，则INFO级别向下的级别，比如DEBUG日志将不会被记录-->

			<!--如果没有定义LEVEL的值，则缺省为DEBUG-->

			<level value="ALL" />
			<appender-ref ref="RollingLogFileAppender" />
			<appender-ref ref="RollingLogFileErrorAppender" />
		</root>
	</log4net>
</configuration>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http;
using System.Web.Mvc;
using System.Web.Routing;

namespace MvcLog4Net
{
    // Note: For instructions on enabling IIS6 or IIS7 classic mode,
    // visit http://go.microsoft.com/?LinkId=9394801
    public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();

            WebApiConfig.Register(GlobalConfiguration.Configuration);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            log4net.Config.XmlConfigurator.Configure();
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcLog4Net.Controllers
{
    public class HomeController : Controller
    {
        //
        // GET: /Home/

        public ActionResult Index()
        {

            log4net.ILog log = log4net.LogManager.GetLogger(typeof(HomeController));

            log.Info("这个是 Info Level 的日志！");

            log.Error("这个是 Error Level 的日志！");

            return View();
        }

    }
}

来源：https://jingyan.baidu.com/album/7e4409530087222fc0e2ef99.html?picindex=1