Re: Delegate.BeginInvoke and EndInvoke.

When I try calling EndInvoke in the AsyncCallback, as described on page
2 of Richard's example, I get an InvalidCastException when trying to
cast the AsyncState to my delegate. He shows a work around (Code Example
11), but that doesn't seem to work on the 2.0 version of the framework.

Any ideas?=20

-----Original Message-----
From: Discussion forum for developers using Windows Forms to build apps
and controls [mailto:[email protected]] On Behalf Of
Peter Ritchie
Sent: Tuesday, January 15, 2008 11:43 AM
To: [email protected]
Subject: Re: [DOTNET-WINFORMS] Delegate.BeginInvoke and EndInvoke.

In Richard's example (pg 2), he shows using the BeginInvoke overload
that takes the AsyncCallback which calls some method when the call
completes.
In there, as Richard details, you can call EndInvoke.  The AsyncCallback
is called on a ThreadPool thread.  If you're looking to avoid stress on
the threadpool, using your own thread to wait on the wait handle may be
a better option.  Using the AsyncCallback means creating a type to keep
track of the delegate reference in order to call its BeginInvoke.  It's
up to you how complicated you want to be if stressing the threadpool
isn't an issue.

Peter's example has a leak.

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