Assembly: mscorlib (in mscorlib.dll)
The default implementation of this method is intended to be overridden by a derived class to perform some action before the collection is cleared.
The default implementation of this method is an O(1) operation.Notes to Implementers: This method allows implementers to define processes that must be performed before deleting all the elements from the underlying System.Collections.Hashtable. By defining this method, implementers can add functionality to inherited methods without having to override all other methods. OnClear is invoked before the standard Clear behavior, whereas OnClearComplete is invoked after the standard Clear behavior. For example, implementers can exempt certain elements from deletion by a global Clear.
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.