结构化的日志，便于检索以及分析统计。
创建一个默认的AspNetCore WebApi程序，添加以下扩展包：

Serilog.AspNetCore

在Program.cs文件中进行配置

public class Program
    {
        public static IConfiguration configuration { get; } = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
            .AddJsonFile($"appsettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Production"}.json", optional: true, reloadOnChange: true)
            .AddEnvironmentVariables()
            .Build();

        public static int Main(string[] args)
        {
            Log.Logger = new LoggerConfiguration().ReadFrom.Configuration(configuration)
                .MinimumLevel.Debug()
                .Enrich.FromLogContext()
                //输出到Console
                .WriteTo.Console(new RenderedCompactJsonFormatter())
                //输出到文件
                .WriteTo.File(formatter: new CompactJsonFormatter(), "logs\\myapp.text", rollingInterval: RollingInterval.Day)
                .CreateLogger();

            try
            {
                Log.Information("Starting web host");
                CreateHostBuilder(args).Build().Run();
                return 0;
            }
            catch (Exception ex)
            {
                Log.Fatal(ex, "Host Terminated Unexpectedly");
                return 1;
            }
            finally
            {
                Log.CloseAndFlush();
            }
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                })
            //退出时释放日志对象
            .UseSerilog(dispose: true);
    }

别忘记修改这里的配置

image.png

其中appsettings.json中的配置

"Serilog": {
    "MinimumLevel": {
      "Default": "Information",
      "Override": {
        "Microsoft": "Error",
        "System": "Information"
      }
    }
  }

详细配置直接参考官网：https://github.com/serilog/serilog/wiki/Configuration-Basics

顺便附带上不使用配置文件的方式（偷个懒，抄一抄IDS Demo的配置）

Log.Logger = new LoggerConfiguration()
                .MinimumLevel.Debug()
                .MinimumLevel.Override("Microsoft", LogEventLevel.Warning)
                .MinimumLevel.Override("Microsoft.Hosting.Lifetime", LogEventLevel.Information)
                .MinimumLevel.Override("System", LogEventLevel.Warning)
                .MinimumLevel.Override("Microsoft.AspNetCore.Authentication", LogEventLevel.Information)
                .WriteTo.File(
                    @"D:\home\LogFiles\Application\identityserver.txt",
                    fileSizeLimitBytes: 1_000_000,
                    rollOnFileSizeLimit: true,
                    shared: true,
                    flushToDiskInterval: TimeSpan.FromSeconds(1))
                .WriteTo.Console(outputTemplate: "[{Timestamp:HH:mm:ss} {Level}] {SourceContext}{NewLine}{Message:lj}{NewLine}{Exception}{NewLine}", theme: AnsiConsoleTheme.Code)
                .CreateLogger();

            try
            {
                Log.Information("Starting host...");
                CreateHostBuilder(args).Build().Run();
                return 0;
            }
            catch (Exception ex)
            {
                Log.Fatal(ex, "Host terminated unexpectedly.");
                return 1;
            }
            finally
            {
                Log.CloseAndFlush();
            }