Hello,

if I understand the documentation correct, this is the only way using a property in an interface:

   IMyInterface = interface
     function GetTag: Integer;
     procedure SetTag(AValue: Integer);
     property Tag: Integer read GetTag write SetTag;
   end;

Or exists a possibilty to define the interface like that:

   IMyInterface = interface
     property Tag: Integer;
   end;

And the programmer who implement this interface could decides how to implement the property?

regards
Michael

Not as I'm aware of, because without that the compiler wouldn't be able to call "code" behind the property (even if it's only a field). While this could be worked around in the compiler if the implementation is in the same binary, it's impossible if you use interfaces across DLL boundaries where you don't have (by definition) access to the source (it could even be done in a different language...).

Regards,
Sven