Basic Prism Logging

App.xaml.cs

namespace AwesomeApp
{ 
    public partial App : PrismApplication
    {
        protected override ILoggerFacade CreateLogger() =>
            new AwesomeApp.Services.DebugLogger();
    }
}

DebugLogger.cs

using Prism.Logging;
using static System.Diagnostics.Debug;

namespace AwesomeApp.Services
{
    public class DebugLogger : ILoggerFacade
    {
        public void Log(string message, Category category, Priority priority) =>
            WriteLine($"{category} - {priority}: {message}");
    }
}