# Wednesday, August 27, 2003

Just finished struggling through yet another Windows Forms issue that had us completely baffled.  Writing multi-threaded WinForms applications brings up some very interesting challenges, and involves learning a bunch of new stuff, some of which is not at all obvious.  See my previous posts on InvokeRequired for a good example. There end up being some really interesting consequences of the boundary between the CLR only world, and the underlying implementation where windows have to deal with message pumps.  While WinForms insulates us from the real underlying PeekMessage calls, they are still there, and at some point the rubber has to meet the road, so to speak.  The problem I just had to deal with is way to complicated to even summarize here, but the core of the problem was that if I call Thread.Sleep on short intervals in a loop with calls to Application.DoEvents in between, the GUI doesn’t update correctly, but if I call Form.ShowDialog then it does.  WinForms knows something about message pumping that I don’t, which doesn’t really come as a surprise. 

Some days I think that this is way harder than MFC was, but on other days (like today) I realize that the real difference is that WinForms frees us to hurt ourselves in new and different ways that were too hard to achieve before.  I can only think that’s a step in the right direction. J

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