Visualforce Developer Guide
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StandardController Class
Use a StandardController when defining an extension for
a standard controller.
Namespace
ApexPages
Usage
StandardController objects reference the pre-built Visualforce controllers provided by Salesforce. The only time it is necessary to refer to a StandardController object is when defining an extension for a standard controller. StandardController is the data type of the single argument in the extension class constructor.
Instantiation
You can instantiate
a StandardController in the following way:
Example
The following example shows how a StandardController object can be used in the constructor for a standard controller extension:
The following Visualforce markup shows how the controller extension from above can be used in a page: