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.NET Forum / .NET Framework / CLR / May 2006Detecting "this XXX in not supported by this YYY" via reflection?
Is there a way to tell via reflection whether a class does not support an event/method/property defined in a base class? For example, consider: WebBrowser Events: Event: Click Description: This event is not supported by this control. (Inherited from WebBrowserBase) We are automatically hooking up event handlers to events, and are getting System.NotSupportedException exceptions when trying to hook up to such events. So far, I haven't been able to figure out a way to exclude these types of events. Thanks, Larry No as a general rule there is no good way to do this unless thought is put in ahead of time to either place a "NonImplementedAttribute" or to have an interface which defines whether or not functionalities are available (i.e. Stream.CanSeek) > Is there a way to tell via reflection whether a class does not support > an event/method/property defined in a base class? For example, [quoted text clipped - 12 lines] > Thanks, > Larry Greg, Thank you for your response. Larry > No as a general rule there is no good way to do this unless thought is put > in ahead of time to either place a "NonImplementedAttribute" or to have an > interface which defines whether or not functionalities are available (i.e. > Stream.CanSeek) Of course catching a NotSupportedException is far more efficient than reflection, potentially even more efficient than checking a return value because exception handling is outside the critical path. >> Is there a way to tell via reflection whether a class does not support >> an event/method/property defined in a base class? For example, [quoted text clipped - 12 lines] >> Thanks, >> Larry >Of course catching a NotSupportedException is far more efficient than >reflection, potentially even more efficient than checking a return value >because exception handling is outside the critical path. It depends on the problem being solved. If you read my initial message, having a NonImplementedAttribute would be much more efficient. No point in trying to attach to the event if the event isn't supported... Larry Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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