C# style generic interfaces with templates

[Robby]

Newish to D, so bare with me~

I have a few questions surrounding Class Templates and the like if 
anyone has time.

After reading the two pages on templates (lex, and revisited) I haven't 
seen anything regarding interfaces being templated like classes. However 
it doesn't produce a lexical error :

public interface H(T){
    T another();
}
public class A(T) : H!(T)
{
    T t;
    T another(){return t;}
    void curious(){}
}

What I'm aiming for is an equivalent to c#'s generic interfaces. So I 
can remove casting on my interface declarations.
However, when I do this :
  alias A!(int) a;
  assert(a.another()==0);

I get the following error : Error: need 'this' to access member another.

So, is there a way where I can template interfaces as I do classes to 
give a per type based interfaces to the classes?

Further on...

How do I get the A class instantiated? Is that possible with templated 
classes?

public class A(T)
{
	T t;
    	this(){}
}

  alias A!(int) a;
  a b = new a(); // doesn't work
  A! b = new A!(int)();// doesnt either?

  Am I wrong to think that I can use and approach class templates as if 
I were using generics in c#?
  Or am I going about it the wrong way?