Serilog 使用 Microsoft ILogger - 从 .NET Core 中的一个代码记录到不同的位置

Question

I'm using serilog through Microsoft.Extensions.Logging.ILogger. This is my configuration in Program.cs:

public class Program
  {
    public static void Main(string[] args)
    {
      IConfigurationRoot configuration = new ConfigurationBuilder()
                                          .AddJsonFile("appsettings.json")
                                          .Build();
      Log.Logger = new LoggerConfiguration()
                     .ReadFrom.Configuration(configuration)
                     .CreateLogger();
      CreateHostBuilder(args).Build().Run();
    }

    public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
          .UseSerilog()
          .ConfigureLogging((context, logging) =>
          {
            logging.ClearProviders();
            logging.AddSerilog();
          })
          .ConfigureWebHostDefaults(webBuilder =>
          {
            webBuilder.UseStartup<Startup>();
          });
  }

I use the ILogger through DI. Everything works fine. Now I want to log some specific log to some file and some specific log to database. For example I want to log info about something to somewhere and info about something else to somewhere else.

For example: I have a game. I want to log names of connected players and their actions to some file and events in the game and errors to a database.

I know how to log into a db and file, but I dont know how can i separate the logs. How can I do it?

This is the config file (right now just for the file sink).

{
  "Serilog": {
    "Using": [],
    "MinimumLevel": {
      "Default": "Debug",
      "Override": {
        "Microsoft": "Error",
        "System": "Error"
      }
    },
    "Enrich": [ "SomeName" ],
    "WriteTo": [
      { "Name": "Console" },
      {
        "Name": "File",
        "Args": {
          "path": "log.log",
          "rollingInterval": "Day",
          "outputTemplate": "SomeFormat"
        }
      }
    ],
    "Application": "SomeName"
  },

Answer 1

You could try to write your own sinks. The LogEvent class offered by Serilog has a custom

readonly Dictionary<string, LogEventPropertyValue> _properties

which you could use to pass some flags. Based on the flags, your sinks can decide if they act or not upon your message.

But this is all at Serilog lvl. The integration with ILogger might take more thought.

Answer 2

You can store in different sinks by settings filtering exceptions

You could filter in many different ways. The one that worked for me was to filter by namespace like:

var isController = Matching.FromSource("MyApp.Controllers");
var isService = Matching.FromSource("MyApp.Services");
Log.Logger = new LoggerConfiguration()
    .MinimumLevel.Verbose()
    .WriteTo.RollingFile("d:/logs/recon-api-all-{Date}.log")
    .WriteTo.Logger(l => l
        .Filter.ByIncludingOnly(isController)
        .WriteTo.RollingFile("d:/logs/recon-api-controller-{Date}.log"))
    .WriteTo.Logger(l => l
        .Filter.ByIncludingOnly(isService)
        .WriteTo.MSSqlServer(connectionString: ""))
    .WriteTo.Logger(l => l
        .Filter.ByExcluding(e => isController(e) || iService(e))
        .WriteTo.RollingFile("d:/logs/recon-api-other-{Date}.log"))
    .CreateLogger();

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