How to Simulate Application.DoEvents() in WPF?

How to implement functions similar to Application.DoEvents() in WPF applications?

In traditional Windows desktop development, the Application.DoEvents() method allows the program to handle events in the GUI message queue before executing the next line of code. This is critical for updating the UI during long-running computations.

However, WPF's architecture is different, it has a built-in message pump that continuously handles GUI events, so there is no Application.DoEvents() method.

Mock Application.DoEvents() method:

To simulate the effect of Application.DoEvents(), you can use the following code in WPF:

<code class="language-csharp">public static void DoEvents()
{
    Application.Current.Dispatcher.Invoke(DispatcherPriority.Background,
        new Action(delegate { }));
}</code>

This code creates a delegate and dispatches it to the Dispatcher (part of the GUI message pump). Calling this method forces WPF to handle any unhandled events, achieving a similar effect to Application.DoEvents().

For example, in your code, add the following code in the button click event handler:

<code class="language-csharp">DoEvents();</code>

This will ensure that the GUI has processed all pending events before scaling the canvas and updating its size. This helps avoid delays or glitches in UI updates.

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