Why Doesn't My WinRT App's `OnSuspending` Event Fire During Debugging?

WinRT App Suspension Event Debugging Issue

A Windows Phone 8.1 WinRT app's OnSuspending event consistently failed to fire during debugging. A breakpoint set at var deferral = e.SuspendingOperation.GetDeferral(); remained untouched, even after suspending the app for over 10 seconds.

The Debugging Problem Explained

The issue stems from how the OnSuspending event behaves during debugging. According to the Windows developer blog, this event will not trigger while an app is in debug mode.

Development Challenges

This behavior can create significant problems, especially if the OnSuspending event handles complex classes or uses SuspensionManager. The app might work perfectly during debugging but fail in a release build.

Testing the OnSuspending Event

To test the OnSuspending event effectively, bypass the debugging limitations. In Visual Studio, use the Debug Location toolbar. Select "Suspend" from the Lifecycle events dropdown to manually trigger the event, and "Resume" to restart the app.

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