using System;

​

​

public interface Container {

    int ID {get; set;}

}

​

public class Auto : Container {

    public int ID {get; set;}

}

​

public class One<T>  where T : Container{

    public void Do(T x) {

        Console.WriteLine(x.ID);

    }

}

​

​

public class Two {

    public void Do<T>(T x) where T: Container {

        Console.WriteLine(x.ID);

    }

}

​

​

​

​

​

​

public class Program

{

    public static void Main()

    {

        var skoda = new Auto{

         ID = 10

        };

        var one = new One<Auto>();

        one.Do(skoda);

        var two = new Two();

        two.Do<Auto>(skoda);

        var twoBetter = new Two();

        twoBetter.Do(skoda); // type inference - pozna typ

    }

}