CLASS INSTANCING IN VB

by Linda Quinn

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Private

This setting defines an internally creatable object only.
Client applications are unable to create instances of the class.

PublicNotCreatable

This setting defines an internally createble object. The object can be used externally.
Client applications can use instances of this class, but can't create new instances on their own.
The component needs to create the instance of this class and pass it to the client.

MultiUse

Allows any number of objects or instances of this class to be created both internally and externally by the client.

GlobalMultiUse

Same as MultiUse except that explicit creation of instances is not required to invoke class method or property.
In other words, class methods and properties are treated as if the were global in scope.
Invoking a class method or property will automatically instantiate an instance of the class.

A client application can:

Not instantiate and not use a Private class.
Not instantiate but use a PublicNotCreatable class.
Both instantiate and use a MultiUse class.
Both instantiate and use a GlobalMultiUse class.

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This content was created by Linda Quinn of LQNet.

See http://www.lqnet.com for a great collection of articles on this and other topics.

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CLASS INSTANCING IN VB

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