Serilog doesn't write to text file the log of console log in ASP.NET Core 6 minimal API-CodePudding

For debugging, I would like to write all what happens in the ASP.NET service. How I will install it as service, I need to write it in a text file.

But in debugging, I can see the output in console and in the text file.

First, I configure the json settings:

"Serilog": {
    "Using": [ "Serilog.Sinks.Console", "Serilog.Sinks.File" ],
    "MinimumLevel": "Debug",
    "WriteTo": [
      { "Name": "Console" },
      {
        "Name": "File",
        "Args": { "path": "Logs/log.txt" }
      }
    ],

And the I use this code in the program.cs of the ASP.NET Core project:

var configuration = new ConfigurationBuilder()
        .SetBasePath(Directory.GetCurrentDirectory())
        .AddJsonFile("appsettings.json")
        .AddJsonFile($"appsettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Production"}.json", true)
        .Build();

var miFicheroTextoLogger = new LoggerConfiguration()
    .ReadFrom.Configuration(configuration)
    .CreateLogger();

miFicheroTextoLogger.Information("Prueba");

In the console, I can see this:

[17:39:22 INF] Prueba
trce: Grpc.AspNetCore.Server.Model.Internal.ServiceRouteBuilder[2]
      Discovering gRPC methods for GestorOrdenadores.Service.Server.Grpc.GestorOrdenadoresService.
trce: Grpc.AspNetCore.Server.Model.Internal.ServiceRouteBuilder[1]
      Added gRPC method 'SayHello' to service 'greet.Greeter'. Method type: Unary, HTTP method: POST, route pattern: '/greet.Greeter/SayHello'.
dbug: Microsoft.Extensions.Hosting.Internal.Host[1]
      Hosting starting
info: Microsoft.Hosting.Lifetime[14]
      Now listening on: https://[::]:5001
dbug: Microsoft.AspNetCore.Hosting.Diagnostics[13]
      Loaded hosting startup assembly GestorOrdenadores.Service.Server.Host.AspCore
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Production
info: Microsoft.Hosting.Lifetime[0]
      Content root path: D:\desarrollo\proyectos\GestorOrdenadores\GestorOrdenadores.Service.Server.Host.AspCore\bin\Debug\net6.0\
dbug: Microsoft.Extensions.Hosting.Internal.Host[2]
      Hosting started

But in my text file I only have:

2022-08-26 17:39:22.057  02:00 [INF] Prueba

In the text file only writes what I told to write with miFicheroTextoLogger.Information("Prueba"); but I would like to write all what ASP.NET Core tells too.

Thanks.

CodePudding user response：

This code is wrong. First, there's no reason to create another configuration instance. The host generated by the minimal API template already uses these configuration sources.

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.MapGet("/", () => "Hello World!");

app.Run();

As the docs explain the default configuration reads from

appSettings.json and appSettings.{environment}.json
Environment variables
The command line

Logging can be configured through the builder.Logger property. If you add the Serilog.AspNetCore package you can also use the UseSerilog() method through builder.Host :

builder.Host.UseSerilog((ctx, lc) => lc
    .WriteTo.Console()
    .ReadFrom.Configuration(ctx.Configuration));

In this example the logger is configured using both code and settings.

You can also add request logging by adding this after `Build():

app.UseSerilogRequestLogging();

Putting this together :

var builder = WebApplication.CreateBuilder(args);
builder.Host.UseSerilog((ctx, lc) => lc
        .WriteTo.Console()
        .ReadFrom.Configuration(ctx.Configuration));

var app = builder.Build();
app.UseSerilogRequestLogging();

app.MapGet("/", () => "Hello World!");

app.Run();

The Serilog .NET 6 Minimal API example projects shows how to add Serilog to a Minimal API project configure it. It also adds a fallback logger should the startup process fail