How to Safely Update WPF UI Elements from a Background Thread?

WPF thread-safe UI update: avoid the trap of background thread accessing UI elements

In WPF applications, thread safety must be ensured when updating UI elements from a non-UI thread. This can be achieved by calling the UI update operation on the main thread.

In the following code snippet, you are trying to update the FileSystemWatcher collection from a background thread triggered by dataGridRows. However, this causes a crash because the dataGridRows collection operates on the main UI thread, while the file monitor runs on a separate thread.

To solve this problem and safely access UI elements from a background thread, you can use Dispatcher.Invoke(). This method allows you to execute the delegate on the main UI thread, ensuring that UI operations are performed in a synchronous manner.

The following is how to implement Dispatcher.Invoke():

Application.Current.Dispatcher.Invoke(new Action(() => {
    dataGridRows.Add(ds);
}));

Alternatively, you can also use the scheduler for a specific UI element (such as the DataGrid itself):

dataGrid.Dispatcher.Invoke(new Action(() => {
    dataGridRows.Add(ds);
}));

By using Dispatcher.Invoke() you ensure that UI updates are performed on the main thread, preventing potential race conditions and crashes. This approach allows you to safely manipulate UI elements from a background thread while maintaining the integrity of your WPF application.

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