Why Doesn't My WinRT App's Suspending Event Trigger During Debugging?

Debugging and the WinRT Suspend Event: A Troubleshooting Guide

Developing Windows Phone 8.1 apps using WinRT can sometimes present challenges. One common issue is the failure of the suspending event to fire during debugging sessions. Let's examine a typical code snippet and explore the solution:

<code>public App()
{
    ...
    Suspending += OnSuspending;
}

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

This code registers the OnSuspending method to handle app suspension. However, during debugging, this event won't trigger. This is because:

The Debugger Prevents Suspension

The Windows debugger intentionally prevents app suspension to ensure a smooth debugging experience. This behavior is by design.

Testing the Suspension Logic

To accurately test your suspension handling, you have two options:

1. Run Without Debugging: Simply run your app outside of the debugger. This will allow the system to suspend your app normally, triggering the OnSuspending event.

2. Manual Suspension in Visual Studio: Visual Studio's debug toolbar provides a way to simulate suspension:

   • Navigate to Debug -> Debug Location.
   • In the "Lifecycle events" dropdown, select "Suspend" to manually trigger the suspension event.
   • To resume, select "Resume".

Important Debugging Note

This debugging limitation can mask potential problems within your OnSuspending event handler. Errors in this code might not surface during debugging. Always test your suspension logic in a non-debugging environment for reliable results. Thorough testing outside of the debugger is crucial for ensuring your app behaves correctly when suspended.

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