Defines the contract that a class must implement in order to check whether a URL parameter value is valid for a constraint.
Assembly: System.Web (in System.Web.dll)
Thetype exposes the following members.
When you include a constraint for a URL parameter in a route definition, you must represent the constraint as either string or as an object that implements the interface. If the constraint is a string, it is treated as a regular expression. You create a class that implements when you cannot represent the validation logic easily as a regular expression. You add the validation logic in the Match method.