// This method currently looks backward on the invocation list
// for an element that has Delegate based equality with value. (Doesn't
// look at the invocation list.) If this is found we remove it from
// this list and return a new delegate. If its not found a copy of the
// current list is returned.
/// <include file='doc\MulticastDelegate.uex' path='docs/doc[@for="MulticastDelegate.RemoveImpl"]/*' />
protected override sealed Delegate RemoveImpl(Delegate value)
{
// There is a special case were we are removing using a delegate as
// the value we need to check for this case
//
if (!(value is MulticastDelegate))
{
if (base.Equals(value))
{
return(_prev);
}
return(this);
}
// Look for the delegate...
MulticastDelegate v = (MulticastDelegate)value;
if (InternalEquals(v))
{
int size = v.DelSize();
MulticastDelegate p = _prev;
while (--size != 0)
{
p = p._prev;
}
return(p);
}
MulticastDelegate d = (MulticastDelegate)this.MemberwiseClone();
MulticastDelegate root = d;
while (d._prev != null && d._prev.InternalEquals(v) != true)
{
d._prev = (MulticastDelegate)d._prev.MemberwiseClone();
d = d._prev;
}
if (d._prev != null)
{
int size = v.DelSize();
MulticastDelegate p = d._prev._prev;
while (--size != 0)
{
p = p._prev;
}
d._prev = p;
}
return(root);
}
