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Route::Constraints Property

Gets or sets a dictionary of expressions that specify valid values for a URL parameter.

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

public:
property RouteValueDictionary^ Constraints {
	RouteValueDictionary^ get ();
	void set (RouteValueDictionary^ value);
}

Property Value

Type: System.Web.Routing::RouteValueDictionary
An object that contains the parameter names and expressions.

The Constraints property enables you to limit acceptable values for a URL parameter that is processed by a route. You assign a RouteValueDictionary object to the Constraints property. Each element in the RouteValueDictionary object contains the name of a parameter and one of the following:

  • A string that defines a regular expression. The regular expression is case-insensitive.

  • An object that implements the IRouteConstraint interface and that includes a Match method.

The HttpMethodConstraint class implements the IRouteConstraint interface. You can include an instance of the HttpMethodConstraint class as a constraint to specify which HTTP verbs are acceptable for the route.

The following example shows how to create a Route object and set the Constraints, DataTokens, and Defaults properties.

No code example is currently available or this language may not be supported.

The following example shows a Route object whose Constraints property contains a parameter named httpMethod with an instance of the HttpMethodConstraint class for the value.

No code example is currently available or this language may not be supported.

.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.
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