.netcore配置log4net方法

方法一：

1.通过Nuget日志包log4net.aspnetcore

2.在Program中的CreateHostBuilder方法中添加如下代码

public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
            //引用log4net.aspnetcore写日志,筛选部分日志
            .ConfigureLogging((context, loggingBuilder) =>
            {
                loggingBuilder.AddFilter("Microsoft", LogLevel.Warning);
                loggingBuilder.AddFilter("System", LogLevel.Warning);
                //默认根目录路径
                //loggingBuilder.AddLog4Net();

                //指定路径
                var path = System.IO.Directory.GetCurrentDirectory();
                loggingBuilder.AddLog4Net($"{path}/log4netcore.config");
            })

            //未筛选，直接显示全部日志
            //.ConfigureLogging(p =>
            //{
            //    var path = System.IO.Directory.GetCurrentDirectory();
            //    p.AddLog4Net($"{path}/log4netnetcore.config");//配置文件                    
            //})
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup();
            });

3.log4netcore.config文件

 
 
   
     
   

   
     
     
     
       
     
   

   
     
     
     
     
     
     
     
     
       
     
   

   
   
     
     
     
     
   

 

 

方法二：通过类库写日志

1.通过Nuget日志包log4net

2.在Startup中添加如下代码

//配置log4net写日志
        public static ILoggerRepository repository { get; set; }
        //public Startup(IConfiguration configuration)
        //{
        //    Configuration = configuration;
        //}

        public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                //.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
                .AddEnvironmentVariables();
            Configuration = builder.Build();
            repository = LogManager.CreateRepository("NETCoreRepository");
            XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));

            WriteLog.LogRepository = repository;//类库中定义的静态变量

        }

3.在类库中添加如下代码

public class WriteLog
    {
        public static ILoggerRepository LogRepository { get; set; }
    }

    public class Base
    {
        public static readonly ILog log = LogManager.GetLogger(WriteLog.LogRepository.Name,typeof(Base));

        public static void TestLog()
        {
            log.Info("Info Test");
        }
    }

4.log4net.config的内容比上面log4netcore.config多一个节点

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