For example, if the XAML framework is performing layout and an exception is thrown, this exception won’t propagate through any app code. It’s also possible for an exception to be thrown and never have any chance to be caught by app code. The UnhandledException event is fired only when there are no more opportunities for app code to catch an exception through normal propagation. If the inner app code throws an exception and does not catch it, the exception will propagate through the Windows Runtime back to the outer layer of app code, which is given a chance to catch it. For example, imagine that an app event handler calls a Windows Runtime API that in turn invokes a callback. Note that this event will only fire when there is no longer any possibility that app code can catch an exception. For more info about the full set of techniques you might use for debugging and error handling, see Exception handling for in C# or Visual Basic. Handling exceptions in an UnhandledException is just one of many techniques that can be used both for debugging and for run-time exception handling and possible recovery. The Windows Runtime will then fire the UnhandledException event to notify the app of this exception. The UnhandledException event is used to notify the app about exceptions encountered by the XAML framework or by the Windows Runtime in general that have not been handled by app code.įor example, if the Windows Runtime invokes app code like an event handler, and the app code throws an exception and does not catch it, the exception will propagate back to the Windows Runtime. Void UnhandledException(event_token const* cookie) const Īpplication::UnhandledException_revoker UnhandledException(auto_revoke_t, UnhandledExceptionEventHandler const& handler) const public event UnhandledExceptionEventHandler UnhandledException function onUnhandledException(eventArgs) Īpplication.addEventListener("unhandledexception", onUnhandledException) Īpplication.removeEventListener("unhandledexception", onUnhandledException) Īpplication.onunhandledexception = onUnhandledException Public Custom Event UnhandledException As UnhandledExceptionEventHandler Event Type UnhandledExceptionEventHandler Remarks Virtual event UnhandledExceptionEventHandler ^ UnhandledException // RegisterĮvent_token UnhandledException(UnhandledExceptionEventHandler const& handler) const Apps can mark the occurrence as handled in event data. Occurs when an exception can be handled by app code, as forwarded from a native-level Windows Runtime error.
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