Constructor in Interface

[Cristiano de Pádua Milagres Oliveira]

Constructor in a Interface is possible?
If yes, what's the C# syntax?

[Michael]

No. Not possible. Interfaces are never created.

Mike
http://www.seeknsnatch.com

"Cristiano de Pádua Milagres Oliveira" <cr****************@poli.usp.br>
wrote in message news:OH**************@TK2MSFTNGP04.phx.gbl...

Constructor in a Interface is possible?
If yes, what's the C# syntax?

[Marc Gravell]

No, it isn't supported directly, as CLR interfaces operate only on
instances that already exist (hence no ctors nor statics) You could,
however, provide a factory method on the interface (or a second
interface), i.e.

public interface ISomethingFactory {
ISomething Create();
}

Note also that with generics (2.0), the presence of a default ctor can
be specified with the new() clause, e.g.

public void SomeMethod<T>(T something) where T : ISomething, new() {}

Marc

[Cristiano de Pádua Milagres Oliveira]

Maybe I hadn't explain correctly.
What I want know is if is possible define in the Interface the header of the
Class Constructor that is inheriting..

"Cristiano de Pádua Milagres Oliveira" <cr****************@poli.usp.br>
escreveu na mensagem news:OH**************@TK2MSFTNGP04.phx.gbl...

Constructor in a Interface is possible?
If yes, what's the C# syntax?

[Marc Gravell]

No, it isn't. Concrete types define their ctors along their own needs.
After all, you can only (with the exception of where T : new()) create
the actual object by using the concrete ctor (even if using a factory),
or by using reflection.

So no. Not by interfaces.

Marc

[sloan]

I think you're saying

"Can I .. in the Interface .. force a concrete class to implement a certain
constuctor?"

The answer is no. I've found myself at times thinking "That would be nice".

I think the small work around is

interface ICheckMeOut
abstract void Initialize(string abc);
then your concrete has to implement that.. and you call that in your
concrete constructors.

not really clean, I know.


"Cristiano de Pádua Milagres Oliveira" <cr****************@poli.usp.br>
wrote in message news:%2****************@TK2MSFTNGP04.phx.gbl...

Maybe I hadn't explain correctly.
What I want know is if is possible define in the Interface the header of

the

Class Constructor that is inheriting..

"Cristiano de Pádua Milagres Oliveira" <cr****************@poli.usp.br>
escreveu na mensagem news:OH**************@TK2MSFTNGP04.phx.gbl...

Constructor in a Interface is possible?
If yes, what's the C# syntax?