Using log4net in asp.net core

The method of using LOG4NET in the previous ASP.NET MVC is somewhat different. Let’s record it here first. The steps are as follows:

1. In the establishment of the ASP.NET CORE project, search for log4net in NUGET and download and install it

2. Create a log4net.config file in the root directory with the following contents:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

<log4net>
    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" />
    </appender>

    

    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="logfile/" />
      <appendToFile value="true" />
      <rollingStyle value="Composite" />
      <staticLogFileName value="false" />
      <datePattern value="yyyyMMdd'.log'" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="1MB" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>

    
    <root>
      <level value="ALL" />
      <appender-ref ref="ConsoleAppender" />
      <appender-ref ref="FileAppender" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>

</log4net>
</configuration>

3. Change the Startup method in the Startup.cs file and the AddMvc code in the ConfigureServices method. The core code is as follows, remember to refer to the corresponding namespace:

        //log4net日志
        public static ILoggerRepository repository { get; set; }

        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;

            //加载log4net日志配置文件
            repository = LogManager.CreateRepository("NETCoreRepository");
            XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {

            services.AddMvc(options =>
            {
                options.Filters.Add<Models.HttpGlobalExceptionFilter>(); //Add the global exception class
            });
        }

4. Create the HttpGlobalExceptionFilter.cs class in the Models folder to record the global exception in the log. The content code is as follows:

using log4net;
using Microsoft.AspNetCore.Mvc.Filters;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace WebApplication1.Models
{
    /// <summary>
    /// global exception class
    /// </summary>
    public class HttpGlobalExceptionFilter : IExceptionFilter
    {
        private ILog log = LogManager.GetLogger(Startup.repository.Name, typeof(HttpGlobalExceptionFilter));
        public void OnException(ExceptionContext context)
        {
            log.Error(context.Exception) ;
        }
    }
}

5. The following is the code of the controller, if there is an exception, it will be automatically recorded, and the log can also be used to manually record the log information

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using log4net;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Models;

namespace WebApplication1.Controllers
{
    public class HomeController : Controller
    {
        private ILog log = LogManager.GetLogger(Startup.repository.Name, typeof(HttpGlobalExceptionFilter));
        public IActionResult Index()
        {
            throw new Exception("牛腩自定义异常！！！"); //有异常则会记录到logfile文件夹中
            return View();
        }

        public IActionResult About()
        {
            ViewData["Message"] = "Your application description page.";
            log.Info("Open about page!!!"); //Ordinary logging
            return View();
        }

    }
}

Using log4net in asp.net core

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