Why Am I Getting \"This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread\"?

Error Handling: "This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread"

The given error message, "This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread," indicates an attempt to modify an ObservableCollection from a non-UI thread.

As explained in the provided code, the ViewModel's Load() method populates the _matchObsCollection ObservableCollection from a list of GetMatchDetailsDC objects. However, this update is performed outside of the UI thread.

Thread Affinity and the Dispatcher

In WPF, the UI elements, such as the DataGrid, are created on the UI thread and maintain a thread affinity. Any modifications to these elements must be performed from the UI thread to ensure thread safety.

Resolving the Error

To resolve this issue, you can use the App.Current.Dispatcher.Invoke((Action)delegate { ... }) method to invoke the collection update on the UI thread:

<code class="csharp">matchList = proxy.GetMatch().ToList();

foreach (EfesBet.DataContract.GetMatchDetailsDC match in matchList)
{
    App.Current.Dispatcher.Invoke((Action)delegate  // <-- Here
    {
        _matchObsCollection.Add(match);
    });
}</code>

Asynchronous Data Loading in WPF

While using asynchronous methods for data loading is common, it's important to consider thread safety when manipulating UI elements from non-UI threads. Always ensure that any updates to UI elements, such as modifying an ObservableCollection, are performed on the UI thread to avoid thread-related errors.

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