Serilog not logging information logs

Question

In my .NET Core 2.1 project I have installed Serilog, but for some reason it will not log information events. It logs error events, though.

In my appSettings I have:

    "Serilog": {
        "MinimumLevel": {
          "Default": "Information",
          "Override": {
            "Microsoft": "Fatal",
            "System": "Fatal"
          }
        },
        "WriteTo": [
          {
            "Name": "File",
            "Args": {
              "restrictedToMinimumLevel": "Information",
              "path": "D:\\Web\\098_VDSNet4\\Logs\\API.AdminPortal\\.txt",
              "rollingInterval": "Day"
            }
          }
        ]
      }

and in my Startup.cs I have:

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

                services.AddLogging(logging =>
                    logging.AddSerilog(dispose: true)
                );

In the code I have:

            public IActionResult Post(Address address)
            {
                string functionName = "AddressController:Post";

                try
                {
                    logger.LogInformation($"{functionName}");

                    // TOOD Additional Address validation
                    addressRepository.Add(address);
                    addressRepository.Save();

                    return Ok(address);
                }
                catch(Exception ex)
                {
                    logger.LogError(ex, $"{functionName}: There was an error creating the address");
                    return BadRequest();
                }

            }

logger.LogInformation (and I have tried logger.LogDebug as well, that doesn't work either) does not output anything. But logger.LogError does log the correct error.

I have tried changing the default level to Verbose to see if that would kick it into life, but I can't seem to get anything below Error to be output to the log file.

Answer 1

You have to inject the ILogger<HomeController> interface into your HomeController constructor.

    private readonly Microsoft.Extensions.Logging.ILogger _log;

    public HomeController(ILogger<HomeController> logger)
    {
        _log = logger;
    }

You have to tell asp.net core from where to read the configuration (add this in Program.cs):

public static IConfiguration Configuration { get; } = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
            .AddJsonFile($"appsettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT") ?? "Production"}.json", optional: true)
            .Build();

In the Program.cs add UseSerilog:

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>()
            .UseSerilog();

Results: