How Can I Safely Update the WPF UI from Multiple Threads?

WPF multi-threaded UI secure access: using Dispatcher

Using multi-threading to update the user interface (UI) in WPF requires careful consideration to avoid potential exceptions and crashes. This is because UI updates must be performed on the main thread (i.e. UI thread).

To solve this problem, WPF provides the Dispatcher class, which allows thread-safe interaction with the UI. The Dispatcher acts as a communication channel between the worker thread and the UI thread to ensure that UI operations are executed safely.

Use Dispatcher.Invoke()

The Dispatcher class provides the Invoke() method, allowing delegation to be executed on the UI thread. This method takes as parameter a delegate that represents the code that needs to be executed on the UI thread.

For example, to safely add a row to the data grid:

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

Here, Dispatcher.Invoke() calls an anonymous delegate on the main (UI) thread, ensuring that data grid updates are executed safely without throwing any exceptions.

Summary

Safe access to the UI thread in WPF is crucial when dealing with multi-threading. By using the Dispatcher class and its Invoke() method, developers can ensure that UI operations are performed on the correct thread, avoid thread-related issues, and maintain application stability and responsiveness.

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