Performs additional custom processes before setting a value in the DictionaryBase instance.
Assembly: mscorlib (in mscorlib.dll)
abstract OnSet : key:Object * oldValue:Object * newValue:Object -> unit override OnSet : key:Object * oldValue:Object * newValue:Object -> unit
The default implementation of this method is intended to be overridden by a derived class to perform some action before the specified element is set.
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 setting the specified element in the underlying System.Collections.Hashtable. By defining this method, implementers can add functionality to inherited methods without having to override all other methods.
is invoked before the standard Set behavior, whereas OnSetComplete is invoked after the standard Set behavior.
For example, implementers can restrict which values can be overwritten by performing a check inside .
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)