Question

How can I mark the exception as Handled to keep it from bubbling up to the Application_UnhandledException handler in my Silverlight app?

 IObservable<someobject> obs;

 obs.Subscribe( onnext => { }, ex =>
 {
    //error!  how can I mark it as handled?
    System.Windows.MessageBox.Show( ex.Message );
 } );

Update:
In my application it was a RIA Services call so perhaps MarkErrorAsHandled would have solved the issue. Unfortunately the error was fixed on the database side and I’m not set up to recreate it.

Answer 1

For most exceptions you should be fine with providing an OnError handler upon subscription.

However, some frameworks apply additional requirements to exception handling. For example, RIA Services require that System.ServiceModel.DomainServices.Client.OperationBase.MarkErrorAsHandled() is called in a completion callback. If it’s not called, RIA services will throw exception once the callback finishes.