Re: Extending System.Drawing.Rectangle...

Gyorgy,

> Thanks for the replies - my question was mostly theoretical, just out of
> curiosity. I suspected that there is no way to tack on a bunch of methods to
> a struct. I already implemented a new struct which has all the Rectangle
> functionality and all the new methods that I wanted to add - I find the
> Rectangle class very limited, so I wanted a bunch of extra methods (no more
> internal fields.) This way at least there is no delegation cost (there is no
> internal Rectangle instance to call) - the conversion cost will be less
> during run-time.

I don't believe delegating would cause any additional cost. Any calls
to the inner Rectangle instance could be inlined by the JIT compiler
(because Rectangle is a value type and thus sealed).

However, I agree that it is cumbersome that you can't simply attach
new operations to existing structures (or classes, actually) - that's
why I like extension methods in C# 3.0, they seem to be a clean way to
do this. (As long as you con't need to add state.) But that's only a
solution for the future, not for now.

Fabian