Multicast Delegate bug?

[Andrew Ducker]

Puzzling one for the really geeky people here...

I have a multicast delegate responding to an event, and I want to
remove some of the delegate from it, but it doesn't work as I'd expect.

The following code works as you'd expect:

BlankDelegate x = new BlankDelegate(Respond1);
x += new BlankDelegate(Respond2);
x += new BlankDelegate(Respond3);
Event1 += x;

BlankDelegate y = new BlankDelegate(Respond2);
y += new BlankDelegate(Respond3);
Event1 -= x;

i.e. Respond1,2 and 3 are added, then 2 and 3 are removed, so that when
Event1 fires, only Respond1 is triggered.

However, if I add 1,2 and 3, then remove 1 and 3, like so:
BlankDelegate x = new BlankDelegate(Respond1);
x += new BlankDelegate(Respond2);
x += new BlankDelegate(Respond3);
Event1 += x;

BlankDelegate y = new BlankDelegate(Respond1);
y += new BlankDelegate(Respond2);
Event1 -= y;

then _none_ of them are removed and firing event1 causes _all_ of them
to fire.

I _think_ that what's happening is that when it's comparing y to Event1
it's not finding a match, because the 'Previous' link is being compared
along with the rest of the object.

Anyone else seen this happen, or offer an explanation?

Cheers,

Andy D