Start migration to asp .net core + entity framework core

MainServer/Controllers/BaseController.cs

@@ -0,0 +1,15 @@
+using MediatR;
+using Microsoft.AspNetCore.Mvc;
+
+namespace MainServer.Controllers;
+
+public abstract class BaseController<T> : ControllerBase where T : BaseController<T>
+{
+    private ILogger<T>? logger;
+    
+    private ISender? mediator;
+    
+    protected ISender Mediator => (mediator ??= HttpContext.RequestServices.GetService<ISender>()) ?? throw new InvalidOperationException();
+
+    protected ILogger<T> Logger => (logger ??= HttpContext.RequestServices.GetService<ILogger<T>>()) ?? throw new InvalidOperationException();
+}