Can I log to separate files using Serilog?

Question

My ASP.NET Core 2.1 app logs to a Serilog file sink, all the \"usual stuff\" - i.e. app related stuff such as debug, monitoring, performance, etc.

However we also ne

Answer 1

The simplest way I've managed to do this was to implement a new unique interface that I could pass to the DI system to be consumed by the controllers.
Note: In the example I used the Serilog.Sinks.RollingFile NuGet package. Use any other sinks as you see fit. I use asp.net Core 2.1.

New Interface

using Serilog;
using Serilog.Core;

public interface ICustomLogger
{
    ILogger Log { get; }
}

public class CustomLogger : ICustomLogger
{
    private readonly Logger _logger;

    public ILogger Log { get { return _logger; } }

    public CustomLogger( Logger logger )
    {
        _logger = logger;
    }
}

Implementation in Startup.cs

using Serilog;
...
public void ConfigureServices( IServiceCollection services )
{
    ...

    ICustomLogger customLogger = new CustomLogger( new LoggerConfiguration()
        .MinimumLevel.Debug()
        .WriteTo.RollingFile( @"Logs\CustomLog.{Date}.log", retainedFileCountLimit: 7 )
        .CreateLogger() );
    services.AddSingleton( customLogger );

    ...
}

Usage in Controller

public class MyTestController : Controller
{
    private readonly ICustomLogger _customLogger;

    public MyTestController( ICustomLogger customLogger )
    {
        _customLogger = customLogger;
    }

    public IActionResult Index()
    {
        ...
        _customLogger.Log.Debug( "Serving Index" );
        ...
    }
}