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Route.ProcessConstraint Method

Determines whether a parameter value matches the constraint for that parameter.

Namespace:  System.Web.Routing
Assembly:  System.Web (in System.Web.dll)

protected virtual bool ProcessConstraint(
	HttpContextBase httpContext,
	Object constraint,
	string parameterName,
	RouteValueDictionary values,
	RouteDirection routeDirection


Type: System.Web.HttpContextBase
An object that encapsulates information about the HTTP request.
Type: System.Object
The regular expression or object to use to test parameterName.
Type: System.String
The name of the parameter to test.
Type: System.Web.Routing.RouteValueDictionary
The values to test.
Type: System.Web.Routing.RouteDirection
A value that specifies whether URL routing is processing an incoming request or constructing a URL.

Return Value

Type: System.Boolean
true if the parameter value matches the constraint; otherwise, false.


constraint is not a string that contains a regular expression.

.NET Framework

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.