using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("START");

        var categories = new TEST<Categories>().GetSomeItemsDependentSomehowOnT();

        Console.WriteLine(categories.GetType().Name);

        var users = new TEST<Users>().GetSomeItemsDependentSomehowOnT();

        Console.WriteLine(users.GetType().Name);

        Console.WriteLine("END");

    }

​

    public class Categories { }

​

    public class Users { }

​

    public class TEST<TModel>

    {

        public IEnumerable<dynamic> GetSomeItemsDependentSomehowOnT()

        {

            switch (typeof (TModel).Name)

            {

                case "Users":

                    return new[]

                    {

                    new Users()}

​

                    ;

                case "Categories":

                    return Enumerable.Empty<Categories>();

                default:

                    break;

            }

​

            throw new ArgumentException("Unknown type.");

        }

    }

}