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Getting the right WPF dispatcher in a thread


Getting the right WPF dispatcher in a thread

By : kishakuv
Date : January 02 2021, 06:48 AM
wish of those help You most likely can just use Dispatcher.CurrentDispatcher.Invoke...
However, if for some reason that doesn't work, you could have your class receive a reference to the Dispatcher as part of its constructor. Just pass in Dispatcher.CurrentDispatcher from the UI thread at construction time.
code :


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Dispatcher update of a CollectionViewSource.Source throws wrong thread exception while on same thread

Dispatcher update of a CollectionViewSource.Source throws wrong thread exception while on same thread


By : Agam Saputra
Date : March 29 2020, 07:55 AM
this will help I had the same thread issues while binding directly to a CollectionViewSource. I fixed the problem by binding my listbox to a CollectionView object instead.
In your case, you would simply need to change your listbox declaration to:
code :
<ListBox x:Name="MessageList" ItemsSource="{Binding MessagesView.View}">
After async/await change, using Dispatcher.Invoke() doesn't solve CollectionView changes other than Dispatcher thread

After async/await change, using Dispatcher.Invoke() doesn't solve CollectionView changes other than Dispatcher thread


By : Ricky Tan
Date : March 29 2020, 07:55 AM
like below fixes the issue Sounds like your collection view is being created on a background thread, which is not a good idea in general.
If you're loading data using async/await (and your data loading supports asynchronous operations), then you shouldn't need to use background threads.
Application.Current.Dispatcher vs DependencyObject.Dispatcher for UI Thread Access

Application.Current.Dispatcher vs DependencyObject.Dispatcher for UI Thread Access


By : Ankit
Date : March 29 2020, 07:55 AM
To fix the issue you can do Not all DispatcherObject instances are necessarily created on the primary UI thread (some applications use a thread per Window approach).
I would personally advise using DispatcherObject.Dispatcher.BeginInvoke as regardless of which thread created the entity, the use of the DispatcherObject in the delegate will succeed.
code :
// Will always work
myTextBox.Dispatcher.BeginInvoke(new Action(myTextBox.Focus));
// May fail if myTextBox was created on a different thread
Application.Current.Dispatcher.BeginInvoke(new Action(myTextBox.Focus));
Calling Dispatcher.Invoke() on Dispatcher thread

Calling Dispatcher.Invoke() on Dispatcher thread


By : user2447356
Date : March 29 2020, 07:55 AM
help you fix your problem I suspect the issue here is a wrong .NET synchronization context (or lack of thereof) in the 1st case.
As far as I understand, this code is called from an unmanaged host, which naturally doesn't have a .NET synchronization context installed on the main UI thread.
code :
System.Diagnostics.Debug.WriteLine(new { System.Threading.SynchronizationContext.Current });
window.Show(); // throws InvalidOperationException
Dispatcher.CurrentDispatcher.Invoke(() => {
    System.Diagnostics.Debug.WriteLine(new { System.Threading.SynchronizationContext.Current });
    window.Show();
});
Use of Application.Current.Dispatcher for events outside dispatcher thread

Use of Application.Current.Dispatcher for events outside dispatcher thread


By : Nathan VS
Date : March 29 2020, 07:55 AM
This might help you
Should "Application.Current.Dispatcher.Invoke" be put in the worker thread raising an event or in the UI code handling the event?
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