ASP.NET CORE3 配置log4net 日志

在微软发布的ASP.NET Core 中给了一种默认的日志配置选择，那么当我们使用其他的日志中间件是如何配置呢？如下：

1、使用NutGet 获取日志库：Microsoft.Extensions.Logging.Log4Net.AspNetCore  和 Log4Net库

2、配置Program.cs

1public class Program
2    {
3        public static void Main(string[] args)
4        {
5            CreateHostBuilder(args).Build().Run();
6        }
7
8        public static IHostBuilder CreateHostBuilder(string[] args) =>
9            Host.CreateDefaultBuilder(args)
10                .ConfigureWebHostDefaults(webBuilder =>
11                {
12                    webBuilder.UseStartup<Startup>();
13                })
14            .ConfigureLogging((hosttingContext,logging)=>
15            {
16                logging.AddFilter("System", LogLevel.Warning);
17                logging.AddFilter("Microsoft", LogLevel.Warning);
18                logging.AddLog4Net();
19            })
20            
21            ;
22    }

 3、配置Startup.cs文件

1  public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactory)
2        {
3            if (env.IsDevelopment())
4            {
5                app.UseDeveloperExceptionPage();
6            }
7            else
8            {
9                app.UseExceptionHandler("/Home/Error");
10                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
11                app.UseHsts();
12            }
13            loggerFactory.AddLog4Net();
14            app.UseHttpsRedirection();
15            app.UseStaticFiles();
16
17            app.UseRouting();
18
19            app.UseAuthorization();
20
21            app.UseEndpoints(endpoints =>
22            {
23                endpoints.MapControllerRoute(
24                    name: "default",
25                    pattern: "{controller=Home}/{action=Index}/{id?}");
26            });
27        }

3、新建配置文件：

1<?xml version="1.0" encoding="utf-8" ?>
2<log4net>
3  <appender name="DebugAppender" type="log4net.Appender.DebugAppender" >
4    <layout type="log4net.Layout.PatternLayout">
5      <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
6    </layout>
7  </appender>
8  <!--指定日记记录方式，以滚动文件的方式（文件记录）-->
9  <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
10    <!--日志路径-->
11    <file value="Log/" />
12    <!--是否是向文件中追加日志-->
13    <appendToFile value="true" />
14    <!--log保留天数-->
15    <param name= "MaxSizeRollBackups" value= "10"/>
16    <!--每个文件最大1M-->
17    <param name="maximumFileSize" value="1MB" />
18    <!--日志根据日期滚动-->
19    <param name="RollingStyle" value="Date" />
20    <!--日志文件名格式为:logs_20080831.log-->
21    <param name="DatePattern" value="&quot;logs_&quot;yyyyMMdd&quot;.log&quot;" />
22    <!--日志文件名是否是固定不变的-->
23    <param name="StaticLogFileName" value="false" />
24    <!--布局-->
25    <layout type="log4net.Layout.PatternLayout">
26      <conversionPattern value="%date %5level %logger.%method [%line] - MESSAGE: %message%newline %exception" />
27    </layout>
28  </appender>
29  <root>
30    <level value="ALL"/>
31    <appender-ref ref="DebugAppender" />
32    <appender-ref ref="RollingFile" />
33  </root>
34</log4net>