Why Aren't My WinRT Suspending Events Triggering During Debugging?

Troubleshooting WinRT Suspension Events During Debugging

Developing Windows Phone 8.1 apps using WinRT often presents challenges when testing suspension events. The Suspending event, crucial for saving app state, may appear unresponsive during debugging. For example, the following code snippet might not trigger the OnSuspending method as expected:

<code class="language-csharp">Suspending += OnSuspending;

private void OnSuspending(object sender, SuspendingEventArgs e)
{
    var deferral = e.SuspendingOperation.GetDeferral();
    deferral.Complete();
}</code>

This lack of triggering stems from the debugger's behavior. The Windows operating system actively prevents suspension while an app is under active debugging. As noted elsewhere:

"While debugging, the suspending and resuming events will never trigger, even if the app is minimized and restored. This is because Windows will not suspend an app while it's being debugged."

Effective Debugging Techniques

To effectively test your suspension handling, consider these approaches:

• Simulate Suspension: Utilize the application lifecycle controls within the debugging toolbar to manually initiate the suspension event.
• Temporarily Disable Debugging: If observing the app's suspension behavior in a non-debug environment is essential, temporarily disable the debugger.

It's vital to remember that the Suspending event functions correctly outside of a debugging context. However, potential errors within the OnSuspending event handler might manifest differently during debugging. Therefore, manually triggering the suspension event is the preferred method for testing during debugging sessions.

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