using System;

using System.Linq;

using System.Collections.Generic;   

​

public class Program

{

    public static void Main()

    {

        var model = new Test();

        Func(model);

        Console.WriteLine("Hello World");

    }

    public static void Func<T>(IEnumerable<T> models) where T : ITest

    {

    }

    public static void Func<T>(T model) where T : ITest

    {

        Func(new [] { model });

    }

    public interface ITest

    {

    }

    public class Test : ITest

    {

    }

}