c# 2010 winforms update animated gif without using application.doevents

Posted on 2013-06-06
Last Modified: 2013-06-07

I have an application which has a few processes which can take some time to complete, especially over the network.  So to give the user some feedback, I have a hidden panel, which I make visible once the process starts, and remove it from the screen when the process finished... in the panel I have a animated gif (ajax load type) and a message saying the system is thinking...

trouble it, the animated gif doesn't update without doing an application.doevents (putting this in makes the process take twice as long)

so is there any way for me to refresh the animated gif so that the animation will play fluid?


Question by:cycledude
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LVL 44

Expert Comment

ID: 39228120
>>so is there any way for me to refresh the animated gif so that the animation will play fluid?

Yes, but you might not like it.
The DoEvents is to force the main thread to process any waiting messages.  Actions that take a long time to complete (such as yours) really should be done in a separate thread to allow the main thread to work normally.  So, to make your app work 'correctly' you should do the process in another thread.  (It shouldn't be too much more recoding but definately more than just adding a DoEvents in a loop somewhere).

Author Comment

ID: 39228137
Thanks andy

How do I go about setting the process to run in a separate thread?
LVL 44

Accepted Solution

AndyAinscow earned 500 total points
ID: 39228148
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LVL 13

Expert Comment

by:Naman Goel
ID: 39228151
There are so many ways to achieve this, the easiest and robust one is by using backgroundworker, move your time consuming code in dowork event handler.

The other was to use Delegate

create a method for your time consuming method and call it in using BeginInvoke method.

Author Closing Comment

ID: 39228154
thanks andy, thats great ;o)

Author Comment

ID: 39228308
sorry naman_goel, I didn't see your response before I awarded the points, otherwise you would have had a share, because your suggestion looks like it work too..
LVL 13

Expert Comment

by:Naman Goel
ID: 39228320
:) .

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