HttpMethodConstraint Class


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Enables you to define which HTTP verbs are allowed when ASP.NET routing determines whether a URL matches a route.

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


public class HttpMethodConstraint : IRouteConstraint


Initializes a new instance of the HttpMethodConstraint class by using the HTTP verbs that are allowed for the route.


Gets the collection of allowed HTTP verbs for the route.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethodMatch(HttpContextBase, Route, String, RouteValueDictionary, RouteDirection)

Determines whether the request was made with an HTTP verb that is one of the allowed verbs for the route.


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns a string that represents the current object.(Inherited from Object.)

The HttpMethodConstraint class enables you to limit route matching to certain HTTP verbs. For example, you can specify that a route is considered a match for a URL only when the HTTP verb for the request is POST.

To set constraints for route matching, you set the Constraints property of the Route class to an instance of the RouteValueDictionary class. To set an HTTP verb constraint, you set the value of one dictionary element to an HttpMethodConstraint object and the key to any name.

In the HttpMethodConstraint method, you include all the HTTP verbs that are allowed for the route when ASP.NET routing determines whether the route matches a URL.

The following example shows a Route object whose Constraints property contains an item that has a key named httpMethod and that has a value that is an instance of the HttpMethodConstraint class.

void Application_Start(object sender, EventArgs e) 

public static void RegisterRoutes(RouteCollection routes)
    string[] allowedMethods = { "GET", "POST" };
    HttpMethodConstraint methodConstraints = new HttpMethodConstraint(allowedMethods);

    Route reportRoute = new Route("{locale}/{year}", new ReportRouteHandler());
    reportRoute.Constraints = new RouteValueDictionary { { "httpMethod", methodConstraints } };


.NET Framework
Available since 3.5

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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