ASP.Net Core整合Serilog简易入门

官方文档：https://serilog.net/

PM> Install-Package Serilog	
PM> Install-Package Serilog.Sinks.Console	#输出到控制台
PM> Install-Package Serilog.Sinks.File		#输出到本地文件

nuget下载这几个包

在Program的Main方法中配置Serilog，这里选择直接输出本地文件

    public static void Main(string[] args)
        {
            Log.Logger = new LoggerConfiguration()
              .ReadFrom.Configuration(new ConfigurationBuilder()
              .AddJsonFile("appsettings.json")
              .Build())
              .WriteTo.File(Path.Combine("logs", "log"), rollingInterval: RollingInterval.Minute) //日志生成路径，项目根目录logs文件夹， rollingInterval: RollingInterval.Minute 每分钟生成一次
              .CreateLogger();
               CreateHostBuilder(args).Build().Run();
        }

		//CreateHostBuilder方法中添加UseSerilog()
 		public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                }).UseSerilog();   //添加UseSerilog()

在appsettings.json文件中把原来的log配置删除,添加Serilog配置。

输出格式可参考官方文档Configuration Basics

{
  "Serilog": {
    // 日志输出级别
    "MinimumLevel": {
      "Default": "Information",
      "Override": {
        // 日志调用类命名空间如果以 Microsoft 开头，覆盖日志输出最小级别为 Information
        "Microsoft": "Information",
        "System": "Information", //简化日志
        "Microsoft.AspNetCore": "Information"
      }
    }
  },
  "AllowedHosts": "*"
}

在Controller里构造函数注入，直接使用ILogger

 private readonly ILogger<HomeController> log;
        public HomeController(ILogger<HomeController> logger)
        {
            log = logger ?? throw new ArgumentException(nameof(logger));
        }


      [HttpGet]
        public ActionResult<string> Get()
        {
            log.LogInformation("Hello AsUu.");
            log.LogError("Goodbye AsUu");
           	//记录
            return  "AsUu";
        }

运行之后生成该分钟内的日志文件

Serilog日志的级别（Level）

Level	Usage
Verbose	Verbose is the noisiest level, rarely (if ever) enabled for a production app.
Debug	Debug is used for internal system events that are not necessarily observable from the outside, but useful when determining how something happened.
Information	Information events describe things happening in the system that correspond to its responsibilities and functions. Generally these are the observable actions the system can perform.
Warning	When service is degraded, endangered, or may be behaving outside of its expected parameters, Warning level events are used.
Error	When functionality is unavailable or expectations broken, an Error event is used.
Fatal	The most critical level, Fatal events demand immediate attention.

当然也有其他方法，这里只列举了这一种。Serilog是十分成熟、灵活和功能强大的日志框架，Serilog的输出对象称为sink（水槽），在社区中提供了大量的开源的sinks，如MongoDb，RabbitMQ，PostgreSQL等等。