Generic ICollection and interfaces

[Allan Ebdrup]

I have a public sealed Class A that implements the interface I.
Now I want to pass an ICollection<Aas a parameter to a method that takes a
parameter of the type ICollection<Ibut I get the error:

Can't convert from System.Collections.Generic<Ato
System.Collections.Generic<I>

Shouldn't I be able to pass ICollection<Ato a method that takes
ICollection<Iwhen A implements I ?

Do I really need to cast ICollection<Ato ICollection<Ibefore passing it?

Kind Regards,
Allan Ebdrup

[Marc Gravell]

Casting won't work...

What you nead is a generic method:

public void SomeMethod<T>(ICollection<Titems)
where T : ISomeInterface
{

}
You should find that you can then call this without specifying the generic
parameter:

ICollection<AmyItems = //TODO; needs A : ISomeInterface
SomeMethod(myItems);

Marc

[Allan Ebdrup]

"Marc Gravell" <ma**********@gmail.comwrote in message
news:u5**************@TK2MSFTNGP02.phx.gbl...

Casting won't work...

What you nead is a generic method:

public void SomeMethod<T>(ICollection<Titems)
where T : ISomeInterface
{

}
You should find that you can then call this without specifying the generic
parameter:

ICollection<AmyItems = //TODO; needs A : ISomeInterface
SomeMethod(myItems);

Thanks that did the trick.

Kind Regards,
Allan Ebdrup