C# Window gets blank when busy -> Progressbar? But how?

Question

I have a program which does some copy jobs (via File.Copy) that could last a few minutes. When the user brings another window to foreground in this time the program window gets blank since it doesn't redraw itself.

Now I want to show a ProgressBar in an extra window in the center of the screen, but that window get's blank too.

So I startet it in another thread which didn't help.

I'm quite sure someone did this before but I cannot find a working example. Any Ideas?

Do your long running process in a BackgroundWorkerThread. – ChrisF Aug 19 '11 at 13:36 — ChrisF, Aug 19 '11 at 13:36

score 4 · Accepted Answer · answered Aug 19 '11 at 13:37

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There is nice example in the documentation on BackgroundWorker class.

answered Aug 19 '11 at 13:37

artplastika

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thanks. such things are too hard to find if your're not knowing what exactly you are looking for.... who would have thought that this is a component?^^ – ihavenoaccount Aug 19 '11 at 14:07

score 0 · Answer 2 · edited May 23 '17 at 12:04

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You can use BackgroundWorker class.

See this answer.

edited May 23 '17 at 12:04

Community

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answered Aug 19 '11 at 13:37

CB.

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score 0 · Answer 3 · answered Aug 19 '11 at 13:38

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ChrisF is correct. Your long operation should be done in a BackgroundWorker thread. You can use BackgroundWorker to report progress, and hook that up to a progress bar on your form.

answered Aug 19 '11 at 13:38

Daniel Walker

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score 0 · Answer 4 · answered Aug 19 '11 at 13:39

You need to thread your operation using a BackgroundWorker. There are other ways to thread the operation, but this one is probably the simplest, and will continue to perform message pumping in the foreground so Windows doesn't think your application has stopped responding.

Another option would be to use a Thread, and use Thread.Join to wait for the background task to complete, since Thread.Join also sends standard message pump information to Windows while it waits.

C# Window gets blank when busy -> Progressbar? But how?

4 Answers4