DictionaryBase.OnValidate Method (Object, Object)


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Performs additional custom processes when validating the element with the specified key and value.

Namespace:   System.Collections
Assembly:  mscorlib (in mscorlib.dll)

abstract OnValidate : 
        key:Object *
        value:Object -> unit
override OnValidate : 
        key:Object *
        value:Object -> unit


Type: System.Object

The key of the element to validate.

Type: System.Object

The value of the element to validate.

The default implementation of this method is intended to be overridden by a derived class to perform some action when the specified element is validated.

The On* methods are invoked only on the instance returned by the Dictionary property, but not on the instance returned by the InnerHashtable property.

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 System.Collections.Hashtable. 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 System.Collections.Hashtable.

The following code example implements the DictionaryBase class and uses that implementation to create a dictionary of String keys and values that have a Length of 5 characters or less.

No code example is currently available or this language may not be supported.

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
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