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Start the application, set a breakpoint at My explanations is as following: AFAIK winform still uses the WINAPI function.
As English is not my first language, forgive me for any mistakes.
And after reading this article Multithreading in Win Forms I have found something interesting.
The article says at the bottom of the first page, that the UI thread can not repaint the UI until the currently executed function finishes and the window is marked by Windows as "not responding" instead after a while. The MSDN article about WM_PAINT states in its first sentence that the WM_PAINT command is only sent by the system when the message queue is empty.
First of all, as others have already mentioned, long-running operations should be done by a thread, which can be a background worker, an explicit thread, a thread from the threadpool or (since .
Net 4.0) a task: Stackoverflow 570537: update-label-while-processing-in-windows-forms, so that the UI keeps responsive.
Obviously I would run the calculations in another thread, so the UI doesn't freeze, but I don't know how to update the UI, since all the calculation methods are part of another class.
After a lot of reasearch I think the best method to go with would be using dispatchers and TPL and not a backgroundworker, but honestly I am not sure how they work and after around 20 hours of trial and error with other answers, I decided to ask a question myself.
(For the following test it is important to not have Visual Studio set to fullscreen, you must be able to see your little application window at the same time next to it, You must not have to switch between the Visual Studio window for debugging and your application window to see what happens.
In the background this also starts a new thread and runs the action there, but it is much easier to handle and has some other benefits.
@4) Here we also start the action, but this time we return the task, so the "async event handler" can "await it".
We could also create is the only "awaitable operation" and is the last one we can simply return the task and save one context switch, which saves some execution time.
@5) Here I now use a "strongly typed generic event" so we can pass and receive our "status object" easily @6) Here I use the extension defined below, which (aside from ease of use) solve the possible race condition in the old example.