interfaces

[Tamer_Ahmed]

hi all

i read many books about compnent and com+ and all books always talk about interfaces i know interfaces in vb.net and c# and how to impelement it but i don't feel that the interfaces in VB & C# is similar to interfaces in component & com+ do am right and if there's any different can anyone tell me what is that different :D

[PlausiblyDamp]

Interfaces are merely a way of providing polymorphism when it comes to the idea of OOP (in VB 6 and earlier and COM they were the only supported way).

Under .Net you will find interfaces are more flexible than under COM (interfaces can inherit from each other for starters) but server the same basic purpose.

[Tamer_Ahmed]

so u mean that interfaces was a way of providing polymorphism is that mean that the methods and procedures was contain the code and the client doesn't need to impelement it like .net do am right

[PlausiblyDamp]

An interface defines a required set of methods / properties / events. Any class or struct that implements an interface is required to provide an implementation of ALL of these.

 

Other code could be written that only expects to work on variables whose type is the interface, this code will then be able to work with any class or struct that implements said interface. The calling code never needs to know the specifics of how a particular class / struct decides to implement the functionality, it can just call it blindly.

[Tamer_Ahmed]

Thanks

PlausiblyDamp