Serilog and .NET Core 2.1 HostBuilder Configuration

Question

I'm using the .NET Core 2.1 HostBuilder class to set up and run a GRPC server and am having trouble getting SeriLog properly configured so that it is used by the .NET Core logging pipeline as well as available (via dependency injection) elsewhere in my app.

class Program
{
    private static async Task Main(string[] args)
    {
        var hostBuilder = new HostBuilder()
            .ConfigureServices((hostContext, services) =>
            {
                services.AddSingleton<ILogger>(BuildLogger);

                // other services here 
            })
            .ConfigureLogging((hostContext, loggingBuilder) =>
                loggingBuilder.AddSerilog(dispose: true));

        await hostBuilder.RunConsoleAsync();
    }

    private static ILogger BuildLogger(IServiceProvider provider)
    {

        // create a (global) logger
        Log.Logger = new LoggerConfiguration() 
            ...
            .CreateLogger();

        return Log.Logger;
    }
}

The problem is that I need the call to loggingBuilder.AddSerilog() to use the singleton ILogger that was registered with the DI services configuration a few lines above.

I realize I could directly call BuildLogger() to get the ILogger instance and register that instance with the DI service configuration, but it seems like I shouldn't have to. What I'm looking for is a way, from within the .ConfigureLogging() method to access a ServiceProvider instance so I can get the registered ILogger maybe like

serviceProvider.GetRequiredService<ILogger>();

and pass that to the AddSerilog() call. Any ideas?

Answer 1

Try the new package now available in Serilog - https://github.com/serilog/serilog-extensions-hosting.

  public static IHost BuildHost(string[] args) =>
    new HostBuilder()
        .ConfigureServices(services => services.AddSingleton<IHostedService, PrintTimeService>())
        .UseSerilog() // <- Add this line
        .Build();