如何防止 Serilog 自动将每一个小步骤记录为信息？答案

【问题标题】：How to prevent Serilog from logging every little step as information automatically?如何防止 Serilog 自动将每一个小步骤记录为信息？
【发布时间】：2021-08-09 20:48:34
【问题描述】：

我想将 Serilog 用于我的 .Net 5 Web Api 项目。我安装了软件包

Serilog.AspNetCore v4.1.0
Serilog.Sinks.Console v4.0.0

并将 Program.cs 文件更改为

public sealed class Program
{
    public static void Main(string[] args)
    {
        Log.Logger = new LoggerConfiguration()
            .WriteTo.Console()
            .CreateLogger();
        
        CreateHostBuilder(args)
            .Build()
            .Run();
    }

    private static IHostBuilder CreateHostBuilder(string[] args) 
        => Host
            .CreateDefaultBuilder(args)
            .UseSerilog()
            .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup<Startup>(); });
}

我为测试目的创建了一个控制器

[ApiController]
[Route("[controller]")]
public sealed class TodosController : ControllerBase
{
    [HttpGet("{todoId:Guid}")]
    public IActionResult GetTodoById(Guid todoId) => Ok(todoId);
}

使用此端点后，我可以在控制台中看到以下内容

[22:30:11 INF] Now listening on: https://localhost:5001
[22:30:11 INF] Now listening on: http://localhost:5000
[22:30:11 INF] Application started. Press Ctrl+C to shut down.
[22:30:11 INF] Hosting environment: Development
[22:30:11 INF] Content root path: /home/.../Server
[22:30:12 INF] Request starting HTTP/2 GET https://localhost:5001/swagger - -
[22:30:12 INF] Request finished HTTP/2 GET https://localhost:5001/swagger - - - 301 0 - 78.0119ms
[22:30:12 INF] Request starting HTTP/2 GET https://localhost:5001/swagger/index.html - -
[22:30:12 INF] Request finished HTTP/2 GET https://localhost:5001/swagger/index.html - - - 200 - text/html;charset=utf-8 64.9042ms
[22:30:12 INF] Request starting HTTP/2 GET https://localhost:5001/swagger/swagger-ui.css - -
[22:30:12 INF] Request starting HTTP/2 GET https://localhost:5001/swagger/swagger-ui-bundle.js - -
[22:30:12 INF] Request starting HTTP/2 GET https://localhost:5001/swagger/swagger-ui-standalone-preset.js - -
[22:30:12 INF] Sending file. Request path: '/swagger-ui-standalone-preset.js'. Physical path: 'N/A'
[22:30:12 INF] Sending file. Request path: '/swagger-ui.css'. Physical path: 'N/A'
[22:30:12 INF] Sending file. Request path: '/swagger-ui-bundle.js'. Physical path: 'N/A'
[22:30:12 INF] Request finished HTTP/2 GET https://localhost:5001/swagger/swagger-ui-bundle.js - - - 200 986342 application/javascript 191.4506ms
[22:30:12 INF] Request finished HTTP/2 GET https://localhost:5001/swagger/swagger-ui-standalone-preset.js - - - 200 311804 application/javascript 191.4478ms
[22:30:12 INF] Request finished HTTP/2 GET https://localhost:5001/swagger/swagger-ui.css - - - 200 142933 text/css 192.6142ms
[22:30:13 INF] Request starting HTTP/2 GET https://localhost:5001/swagger/v1/swagger.json - -
[22:30:13 INF] Request finished HTTP/2 GET https://localhost:5001/swagger/v1/swagger.json - - - 200 - application/json;charset=utf-8 83.3874ms
[22:30:41 INF] Request starting HTTP/2 GET https://localhost:5001/Todos/00119201-3fed-4741-8295-48d697790729 - -
[22:30:41 INF] Executing endpoint 'Server.Controllers.TodosController.GetTodoById (Server)'
[22:30:41 INF] Route matched with {action = "GetTodoById", controller = "Todos"}. Executing controller action with signature System.Threading.Tasks.Task`1[Microsoft.AspNetCore.Mvc.IActionResult] GetTodoById(System.Guid) on controller Server.Controllers.TodosController (Server).
[22:30:41 INF] Executing OkObjectResult, writing value of type 'System.Guid'.
[22:30:41 INF] Executed action Server.Controllers.TodosController.GetTodoById (Server) in 34.6663ms
[22:30:41 INF] Executed endpoint 'Server.Controllers.TodosController.GetTodoById (Server)'
[22:30:41 INF] Request finished HTTP/2 GET https://localhost:5001/Todos/00119201-3fed-4741-8295-48d697790729 - - - 200 - application/json;+charset=utf-8 121.1434ms

我不认为这是一种期望的行为（如果日志级别是信息而不是跟踪）。我错过了什么？如何防止 Serilog 在没有被要求的情况下记录？

我已经检查了这个问题Serilog - MinimumLoggingLevel Information shows every request in log - is that normal?，但这并没有帮助。未安装 Serilog.Web.Classic 包。

【问题讨论】：

标签： c# serilog

【解决方案1】：

这些日志由 ASP .NET 主机以 Information 级别写入，因此 Serilog 也将它们作为 Information 接收。

你可以做的是覆盖不同来源的MinimumLevel，这样你就可以继续接收一些来源写的Information级别的日志，同时忽略主机写的Information级别的日志。

这是一个例子：

将整体MinimumLevel 设置为Information
仅针对来自 Microsoft 源的日志将 MinimumLevel 覆盖为 Warning
仅针对来自 Microsoft.Hosting.Lifetime 源的日志将 MinimumLevel 覆盖为 Information

例如

Log.Logger = new LoggerConfiguration()
    .MinimumLevel.Information()
    .MinimumLevel.Override("Microsoft", LogEventLevel.Warning)
    .MinimumLevel.Override("Microsoft.Hosting.Lifetime", LogEventLevel.Information)
    .WriteTo.Console()
    .CreateLogger();

您还可以通过appSettings.json 配置这些源覆盖：

{
  "Serilog": {
    "MinimumLevel": {
      "Default": "Information",
      "Override": {
        "Microsoft": "Warning",
        "Microsoft.Hosting.Lifetime": "Information"
      }
    }
  },
  "AllowedHosts": "*"
}

【讨论】：

【解决方案2】：

您需要为"Microsoft.Hosting.Lifetime" 和"Microsoft" 设置日志级别。我个人使用Serilog.Settings.Configuration 包，将.ReadFrom.Configuration(configuration) 添加到设置中，并将默认模板提供的值复制到配置中的Serilog.MinimumLevel.Override json 属性：

  "Serilog": {
    "MinimumLevel": {
      "Default": "Information",
      "Override": {
        "Microsoft": "Warning",
        "Microsoft.Hosting.Lifetime": "Information"
      }
    }
  },

【讨论】：