Performs additional custom processes when clearing the contents of the CollectionBase instance.
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.
If the process fails, the collection reverts back to its previous state.
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.ArrayList. By defining this method, implementers can add functionality to inherited methods without having to override all other methods.
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 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.