fix: Add import for Logging.Abstractions

Author: Reikyo

Examples/BookingSystem.AspNetFramework/Utils/ServiceConfig.cs

@@ -3,6 +3,7 @@
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 // using Microsoft.Extensions.Logging.Console;
+using Microsoft.Extensions.Logging.Abstractions;
 using OpenActive.Server.NET;
 using System.Configuration;
 using System.Web.Http;
@@ -36,9 +37,8 @@ public static void Register(HttpConfiguration config)
             services.AddTransient<OpenBookingController>();
             // var logger = LoggerFactory.AddConsole().CreateLogger<FakeBookingSystem>();
             // var logger = new ILogger<FakeBookingSystem>();
-            // var logger = new NullLogger<FakeBookingSystem>();
-            // new FakeBookingSystem(false, logger)
-            services.AddSingleton<IBookingEngine>(sp => EngineConfig.CreateStoreBookingEngine(appSettings, sp.GetRequiredService<FakeBookingSystem>()));
+            var logger = new NullLogger<FakeBookingSystem>();
+            services.AddSingleton<IBookingEngine>(sp => EngineConfig.CreateStoreBookingEngine(appSettings, new FakeBookingSystem(false, logger)));
 
             var resolver = new DependencyResolver(services.BuildServiceProvider(true));
             config.DependencyResolver = resolver;