Logging Unhandled Exceptions

The MAUI platform have failed to provide an unified way of tracking unhandled exceptions.

The normal way would be to hook into AppDomain.CurrentDomain.UnhandledException, but extra logic needed for iOS and Android:

Exceptions on iOS flows through AppDomain.CurrentDomain.UnhandledException, but one must set UnwindNativeCode:

ObjCRuntime.Runtime.MarshalManagedException += (_, args) =>
{
    args.ExceptionMode = ObjCRuntime.MarshalManagedExceptionMode.UnwindNativeCode;
};

Exceptions on Android only flows through Android.Runtime.AndroidEnvironment.UnhandledExceptionRaiser:

Android.Runtime.AndroidEnvironment.UnhandledExceptionRaiser += (sender, args) =>
{
    // Log unhandled args.Exception
};

NLog.Targets.MauiLog includes unified method to setup UnhandledExceptionEventHandler:

NLog.LogManager.Setup().RegisterMauiLog((sender, ex) => {
    NLog.LogManager.GetLogger("Application").Fatal(ex, "Unhandled Exception");
});

One can also consider monitoring unobserved task exceptions:

TaskScheduler.UnobservedTaskException += (sender, args) => {
    NLog.LogManager.GetLogger("Application").Error(args.Exception, "Unobserved Task Exception");
};