C# WPF not promptly updating graphics

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I have a library which fires events to the main window.
The library fires some events and tells when it has finished through the IsBusy property. I want the graphics to be updated by those event and particularly:

C#

private bool _isBusy;
       public bool IsBusy
       {
           get { return _isBusy; }
           set
           {
               _isBusy = value;
               if (value)
                   imgBusy.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Send,
                                             new Action(() => imgBusy.Source = new BitmapImage( new Uri(@"../../Resources/redBall.png", UriKind.Relative))));
               else
                   imgBusy.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Send,
                                             new Action(() => imgBusy.Source = new BitmapImage(new Uri(@"../../Resources/greenBall.png", UriKind.Relative))));
           }
       }

so what I expect is:

idle --> green
started ---> red
terminated ---> green

while its behaviour is:

1. when launched through backgroundworker:
idle ---> green
started --->green
midway ---> red
terminated --->green.

2. when launched without backgroundworker:
idle,started,midway,terminated --->green

But if I put a breakpoint I see that the code is hit there where the colour of the ball is changed!!

I am new with WPF in winforms there was a Mainform.Update. Is there something similar here?

Thanx for any help Patrick

Posted 10-Nov-15 5:45am

Patrick70__

Updated 10-Nov-15 5:48am

v2

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Mathi Mani · Answer 1 · 2015-11-10T07:19:00

Hi,

The following link answers your question on why busy indicator does not work as expected when used without background worker and also provides a clear explanation on how to work with a busy indicator.

http://elegantcode.com/2011/10/07/extended-wpf-toolkitusing-the-busyindicator/[^]

You can also achieve the same with Tasks instead of background worker. Here is a sample:

Task taskCompare = Task.Factory.StartNew(() =>
            {
                //your long running logic or method invocation

            }).ContinueWith(compareResult =>
            {
               //do something with your result
                _busyIndicator.IsBusy = false;

            });

            BusyIndicatorContent = "your message here";
            _busyIndicator.IsBusy = true;