Thread safe Dependency Property in WPF

Devendra Kumar

6y4.1k

Hello everyone,

I am working on a WPF project and found an issue ot thread calls.

I have a Dependency Property of a usercontrol as below

public bool IsON
{
get { return (bool)GetValue(IsONProperty); }
set { SetValue(IsONProperty, value); }
}

When I access this property, an exception occurs "The calling thread cannot access this object because a different thread owns it"

I tried lock function with a readonly object but no luck.

Is there any solution to make it thread safe on user control side and not from the calling class because I want to handle it from usercontrol side, as the property was used several times

Thanks

Devendra

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Amit Gupta6y ago
Accepted answer
The error seems that you are accessing control on a seperate thread.

You have to use Invoke function to overcome like below
public bool IsON
      {
          get => Dispatcher.Invoke(() => (bool)GetValue(IsONProperty));
          set => Dispatcher.Invoke(() => SetValue(IsONProperty, value));
      }
Try above and do let me know if it solves your issue.
Devendra Kumar6y ago
Thankyou all
Rajanikant Hawaldar6y ago
Try this(refer link) way it's implemented in normal winforms you can implement the same and try. Controls properties are belong to ui thread and Controls events work are belong to background thread.https://stackoverflow.com/questions/661561/how-do-i-update-the-gui-from-another-thread https://stackoverflow.com/questions/142003/cross-thread-operation-not-valid-control-accessed-from-a-thread-other-than-the