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Starting with Microsoft Visual Studio 2005, the Visual Basic application framework provides another event for unhandled exceptions in the main application thread. The UnhandledException event is raised for unhandled exceptions thrown in other threads.
This applies only to the main application thread. 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. In that case, the UnhandledException event is not 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 applications that use Windows Forms, unhandled exceptions in the main application thread cause the Application.ThreadException event to be raised. To register an event handler for this event, you must have the required permissions, or a SecurityException is thrown.įor more information about handling events, see Consuming Events.įor certain application models, the UnhandledException event can be preempted by other events if the unhandled exception occurs in the main application thread. For more information, including a list of cases in which the runtime does not terminate, see Exceptions in Managed Threads.
NET Framework version 2.0, this backstop for unhandled exceptions in child threads was removed, because the cumulative effect of such silent failures included performance degradation, corrupted data, and lockups, all of which were difficult to debug. Thus, it is possible for the UnhandledException event to be raised without the application terminating. NET Framework versions 1.0 and 1.1, an unhandled exception that occurs in a thread other than the main application thread is caught by the runtime and therefore does not cause the application to terminate. NET Framework 4, this event is not raised for exceptions that corrupt the state of the process, such as stack overflows or access violations, unless the event handler is security-critical and has the HandleProcessCorruptedStateExceptionsAttribute attribute. If the event handler has a Reliabilit圜ontractAttribute attribute with the appropriate flags, the event handler is treated as a constrained execution region. The common language runtime suspends thread aborts while event handlers for the UnhandledException event are executing. If that application domain is not the default application domain, the event can also be raised in the default application domain. The first application domain in which the UnhandledException event can be raised is "AD1". If that application domain is not the default application domain, and there is also an event handler in the default application domain, the event is raised in both application domains.įor example, suppose a thread starts in application domain "AD1", calls a method in application domain "AD2", and from there calls a method in application domain "AD3", where it throws an exception. If the thread started in an application domain that has an event handler for UnhandledException, the event is raised in that application domain. If the UnhandledException event is handled in the default application domain, it is raised there for any unhandled exception in any thread, no matter what application domain the thread started in. If an application creates additional application domains, specifying a delegate for this event in those applications domains has no effect. NET Framework versions 1.0 and 1.1, this event occurs only for the default application domain that is created by the system when an application is started. An exception is unhandled only if the entire stack for the thread has been unwound without finding an applicable exception handler, so the first place the event can be raised is in the application domain where the thread originated. However, the event is not necessarily raised in the application domain where the exception occurred. This event can be handled in any application domain. NET Framework versions 1.0 and 1.1, application termination and debugging options are reported to the user before this event is raised, rather than after. Caution is advised, because program data can become corrupted when exceptions are not handled. If sufficient information about the state of the application is available, other actions may be undertaken - such as saving program data for later recovery. It allows the application to log information about the exception before the system default handler reports the exception to the user and terminates the application. Microsoft "This event provides notification of uncaught exceptions.
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