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.Routing (in System.Web.Routing.dll)
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.
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.