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与许多其他 .NET 库一样，Serilog 提供了将诊断日志输出到文件、控制台以及其他位置的功能。它易于设置，拥有简洁的 API，并且可以在最新的 .NET 平台之间进行移植。

官方网站：Serilog — simple .NET logging with fully-structured events

1、安装Serilog

dotnet add package Serilog.AspNetCore

2、将Serilog配置信息添加到appsettings.json

在ASP .NET Core后端服务开发中，任何可配置的项我们都应该配置在appsettings.json文件中。

相关配置信息可查看网站：https://github.com/serilog/serilog-settings-configuration

"Serilog": {"Using": [ "Serilog.Sinks.Console", "Serilog.Sinks.File" ],"MinimumLevel": {"Default": "Information","Override": {"Microsoft": "Warning","System": "Warning"}},"WriteTo": [{"Name": "Console"},{"Name": "File","Args": {"path": "logs\\log.txt","rollingInterval": "Day"}}],"Enrich": [ "FromLogContext", "WithMachineName", "WithThreadId" ]}

3、在Program.cs 文件中使用两阶段初始化方式配置Serilog

为了完全捕获程序启动过程中和启动完成后，所有异常日志信息。

第一步：CreateBootstrapLogger()

程序启动时会立即配置一个初始的“引导（bootstrap）”日志记录器，来记录程序启动过程中发生的异常日志。

Log.Logger = new LoggerConfiguration()
.MinimumLevel.Override("Microsoft", LogEventLevel.Information)
.Enrich.FromLogContext()
.WriteTo.Console()
.WriteTo.File("logs\\log.txt", rollingInterval: RollingInterval.Day)
.CreateBootstrapLogger();

第二步：AddSerilog()

当程序加载完成后，使用appsettings.json文件中Serilog配置来替换引导日志记录器。

builder.Services.AddSerilog((services, lc) => 
lc.ReadFrom.Configuration(builder.Configuration));

4、添加Serilog请求日志记录中间件

app.UseSerilogRequestLogging();

5、完整代码

appsetting.json

{"Serilog": {"Using": [ "Serilog.Sinks.Console", "Serilog.Sinks.File" ],"MinimumLevel": {"Default": "Information","Override": {"Microsoft": "Warning","System": "Warning"}},"WriteTo": [{"Name": "Console"},{"Name": "File","Args": {"path": "logs\\log.txt","rollingInterval": "Day"}}],"Enrich": [ "FromLogContext", "WithMachineName", "WithThreadId" ]}
}

Program.cs

using Serilog;
using Serilog.Events;namespace Common.Backend.WebApi
{public class Program{public static void Main(string[] args){Log.Logger = new LoggerConfiguration().MinimumLevel.Override("Microsoft", LogEventLevel.Information).Enrich.FromLogContext().WriteTo.Console().WriteTo.File("logs\\log.txt", rollingInterval: RollingInterval.Day).CreateBootstrapLogger();try{var builder = WebApplication.CreateBuilder(args);builder.Services.AddSerilog((services, lc) => lc.ReadFrom.Configuration(builder.Configuration));var app = builder.Build();app.UseSerilogRequestLogging();app.Run();}catch(Exception ex){Log.Fatal(ex, "Application terminated unexpectedly");}finally{Log.CloseAndFlush();}}}
}