How Can I Safely Update a WPF UI from a Non-UI Thread?

WPF UI thread-safe access

In WPF applications, updating the UI from non-UI threads (such as file watch events) needs to be handled carefully to avoid exceptions and program crashes. This is caused by the separation of UI threads and non-UI threads in WPF.

Use the Dispatcher.Invoke() method

To safely access the UI thread from non-UI threads, WPF provides the Dispatcher.Invoke() method. It allows you to queue a delegate to the UI thread's scheduler, which guarantees that the delegate will execute when the UI thread is available.

Here’s how you implement this method in code:

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

This ensures that the UI thread safely adds new rows to the dataGridRows collection, preventing any thread synchronization issues.

Other technologies

In addition to Dispatcher.Invoke(), you can use other techniques to safely access the UI thread, such as:

• Dependency Properties: Using dependency properties, it automatically synchronizes updates back to the UI when changed from a non-UI thread.
• BackgroundWorker: Creates a BackgroundWorker thread to perform non-UI tasks and uses its RunWorkerCompleted events to update the UI on the main thread.

By adhering to these safe threading practices, you can avoid potential errors and ensure that your WPF application interacts with the UI thread correctly.

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