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.NET Forum / Windows Forms / WinForm General / February 2007raising events via "Invoke" - good pattern? - or not....
Hi - I am communicating with my UI thread using the following technique. This has appalled one of my co-workers ;) - any comments about it's brilliantness or lack thereof welcome..... two threads: 1) UI thread 2) Worker thread - something happens in the worker thread - I need to update the UI. - worker thread exposes an event - UI thread wires an event handler into that event - when worker thread needs something to happen - it raises the event *** but for the event handler to run on the UI thread - the worker thread raises the event (via "Invoke") *** I like this because the UI thread code needs to simply wire up an event handler. There is hence good separation between the code running the UI, and the code running the Worker thread. O. > Hi - I am communicating with my UI thread using the following > technique. This has appalled one of my co-workers ;) - any comments [quoted text clipped - 17 lines] > > O. Hi, I don't know why that would appall your coworker. It sounds similar to the pattern Microsoft used with System.Timers.Timer and the SynchronizingObject property. Brian Oli, I'd suggest to follow the design pattern of classes like System.Timers.Timer. Those components have property called SynchronizingObject of type ISynchronizeInvoke. If the user sets this proeprty then the event raising code should use the sync object to invoke the event handlers other wise ot raises the event handler directly. This way the user can chose whether he/she wants to handle the event in the context of the worker thread or the UI thread. ISynchronizeInvoke is implemented by the Control class, so if the user provides referenc to a control it basically works in the same way as you call Control.Invoke, thus marshaling the event handler to the UI thread.  SignatureHTH Stoitcho Goutsev (100) > Hi - I am communicating with my UI thread using the following > technique. This has appalled one of my co-workers ;) - any comments [quoted text clipped - 17 lines] > > O.
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