Exception handling for events

Question

I apologize if this is a simple question (my Google-Fu may be bad today).

Imagine this WinForms application, that has this type of design: Main application -> shows

Answer 1

You may be able to use the AppDomain.CurrentDomain.UnhandledException handler to intercept the errors on the main UI thread and handle them per-dialog. From MSDN:

In applications that use Windows Forms, unhandled exceptions in the main application thread cause the Application.ThreadException event to be raised. If this event is handled, the default behavior is that the unhandled exception does not terminate the application, although the application is left in an unknown state. In that case, the UnhandledException event is not raised. This behavior can be changed by using the application configuration file, or by using the Application.SetUnhandledExceptionMode method to change the mode to UnhandledExceptionMode.ThrowException before the ThreadException event handler is hooked up. This applies only to the main application thread. The UnhandledException event is raised for unhandled exceptions thrown in other threads.