c# - Overriding MinimumLevel doesn't work in Serilog

Question

Trying to set minimum log level for Serilog 2.8.0 (in .NET 4.6.2). Logging is working fine, but not the Override feature.

Here is my Program.cs:

using System;
using LogTest1.Classes;
using Microsoft.Extensions.Configuration;
using Serilog;
using SomeLib;


namespace LogTest
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var configuration = new ConfigurationBuilder()
                .AddJsonFile("appsettings.json", false, true)
                .Build();

            Log.Logger = new LoggerConfiguration()
                .ReadFrom.Configuration(configuration)
                .CreateLogger();

            Log.Verbose("Verbose");
            Log.Debug("Debug");
            Log.Information("Information");
            Log.Warning("Warning");
            Log.Error("Error");
            Log.Fatal("Fatal");

            Console.ReadKey();
        }
    }
}

And the appsettings.json file:

{
  "Serilog": {
    "Using": [ "Serilog.Sinks.Console" ],
    "MinimumLevel": {
      "Default": "Warning",
      "Override": {
        "LogTest": "Information"
      }
    },
    "WriteTo": [
      { "Name": "Console" }
    ]
  }
}

Expected to see all the logs, starting from Information, but instead got only from Warning.

Answer 1

根据您的配置，您正在覆盖从 a 发送的MinimumLevel 唯一日志消息SourceContext，名称LogTest为 ....

"Override": {
  "LogTest": "Information"
}

像您正在做的简单调用Log.Information("Information")不会设置源上下文，因此覆盖不适用......您必须先创建上下文。

var contextLog = Log.ForContext("SourceContext", "LogTest");
contextLog.Information("This shows up because of the override!");
contextLog.Information("... And this too!");

Log.Information("This does **not** show, because SourceContext != 'LogTest'");

SourceContext您可以在文档 中阅读更多信息： https ://github.com/serilog/serilog/wiki/Writing-Log-Events#source-contexts