PRB: Choosing Quit in WFC Exception Dialog Box Shuts Down Host (197032)

RESOLUTION

There are two methods for resolving this issue. The first method is to never choose Quit in the WFC exception dialog box that appears when you receive an unhandled exception while hosting a WFC control in a Visual Basic application while running in the Visual Basic IDE. Instead, you should always choose Continue and then shut down the Visual Basic application from within the Visual Basic IDE.

The second method is to add an onThreadExceptionEventHandler to your WFC ActiveX control. This event handler is called instead of the default WFC exception handling routines and the default dialog box that contains the Quit option does not appear. Your WFC control, however, is responsible for handling exceptions, notifying the user, and shutting down as necessary.

Sample Code

The following sample code adds a very simple ThreadException Handler to a WFC ActiveX control:

   // ... Other WFC imports ...
   import com.ms.wfc.app.*; // This creates the Application object.

   public class Control1 extends UserControl {

      // Define a Thread Exception Handler Delegate.
      private void threadException(Object sender, ThreadExceptionEvent e) {
         MessageBox.show("In Exception Handler");
      }

      public Control1() {
         // Add the Thread Exception Handler delegate.
         Application.addOnThreadException( new ThreadExceptionEventHandler
         (this.threadException));

         // Required for Visual J++ Form Designer support.
         initForm();
      }

   // The rest of your WFC ActiveX control goes here...
				

(c) Microsoft Corporation 1998, All Rights Reserved. Contributions by Steve Horne, Microsoft Corporation.