Performs additional custom processes before inserting a new element into 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 specified element is inserted.
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 inserting the element into 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 Insert behavior, whereas OnInsertComplete is invoked after the standard Insert behavior.
For example, implementers can restrict which types of objects can be inserted into the System.Collections.ArrayList.
OnValidate is called prior to this method.
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.