Handling fatal exceptions in ViewModel/Model

Question

I have an application written using the M-V-VM approach.

The data access is done in the Model. If a fatal error occurs here (for example, the connection to the data sour

Answer 1

You could queue an exception-throwing action on the dispatcher.

    // This property is connected to the window using databinding
    public string ExceptionThrowingBoundedField
    {
        get
        {

            try
            {
                // This function might throw an exception
                return GetValueFromDatabase();               
            }
            catch (Exception ex)
            {
                ApplicationException exWrapper = new ApplicationException(
                    "Wrapped Exception",                                                     
                     ex
                );
                Action throwException = () => { throw exWrapper; };
                Dispatcher.CurrentDispatcher.BeginInvoke(throwException);
                return "";
            }
        }
    }

Answer 2

Recently come across a way of getting around the swallowed exception problem in a global way.

Create a custom binding class and override UpdateSourceExceptionFilter - see sample in this thread.

Unfortunately this is just WPF 4.0 and not SL 4.0.