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.NET Forum / Languages / C# / August 2006Constructor in Interface
Constructor in a Interface is possible? If yes, what's the C# syntax? No. Not possible. Interfaces are never created. Mike http://www.seeknsnatch.com > Constructor in a Interface is possible? > If yes, what's the C# syntax? 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 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.. > Constructor in a Interface is possible? > If yes, what's the C# syntax? 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 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. > 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.. > > > Constructor in a Interface is possible? > > If yes, what's the C# syntax? Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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