OnValidate()

OnValidate(value)

OnValidate(ByRef value)

Performs additional custom processes when validating a value.

Parameters

value

The object to validate.

Throws

Throws MfArgumentNullException if value is null.

Remarks

Protected Method
The default implementation of this method determines whether value is null, and, if so, throws MfArgumentNullException. It is intended to be overridden by a derived class to perform additional action when the specified element is validated.

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 when executing the standard behavior of the underlying MfList. By defining this method, implementers can add functionality to inherited methods without having to override all other methods.

OnValidate() can be used to impose restrictions on the type of objects that are accepted into the collection. The default implementation prevents null from being added to or removed from the underlying MfList.

OnValidate() is called prior to OnInsert(), OnRemove(), and OnSet().