Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / Routing / HttpMethodConstraint.cs / 1305376 / HttpMethodConstraint.cs
namespace System.Web.Routing { using System; using System.Collections.Generic; using System.Globalization; using System.Linq; using System.Runtime.CompilerServices; [TypeForwardedFrom("System.Web.Routing, Version=3.5.0.0, Culture=Neutral, PublicKeyToken=31bf3856ad364e35")] public class HttpMethodConstraint : IRouteConstraint { public HttpMethodConstraint(params string[] allowedMethods) { if (allowedMethods == null) { throw new ArgumentNullException("allowedMethods"); } AllowedMethods = allowedMethods.ToList().AsReadOnly(); } public ICollectionAllowedMethods { get; private set; } protected virtual bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection) { if (httpContext == null) { throw new ArgumentNullException("httpContext"); } if (route == null) { throw new ArgumentNullException("route"); } if (parameterName == null) { throw new ArgumentNullException("parameterName"); } if (values == null) { throw new ArgumentNullException("values"); } switch (routeDirection) { case RouteDirection.IncomingRequest: return AllowedMethods.Any(method => String.Equals(method, httpContext.Request.HttpMethod, StringComparison.OrdinalIgnoreCase)); case RouteDirection.UrlGeneration: // We need to see if the user specified the HTTP method explicitly. Consider these two routes: // // a) Route: Url = "/{foo}", Constraints = { httpMethod = new HttpMethodConstraint("GET") } // b) Route: Url = "/{foo}", Constraints = { httpMethod = new HttpMethodConstraint("POST") } // // A user might know ahead of time that a URL he is generating might be used with a particular HTTP // method. If a URL will be used for an HTTP POST but we match on (a) while generating the URL, then // the HTTP GET-specific route will be used for URL generation, which might have undesired behavior. // To prevent this, a user might call RouteCollection.GetVirtualPath(..., { httpMethod = "POST" }) to // signal that he is generating a URL that will be used for an HTTP POST, so he wants the URL // generation to be performed by the (b) route instead of the (a) route, consistent with what would // happen on incoming requests. object parameterValue; if (!values.TryGetValue(parameterName, out parameterValue)) { return true; } string parameterValueString = parameterValue as string; if (parameterValueString == null) { throw new InvalidOperationException(String.Format(CultureInfo.CurrentUICulture, SR.GetString(SR.HttpMethodConstraint_ParameterValueMustBeString), parameterName, route.Url)); } return AllowedMethods.Any(method => String.Equals(method, parameterValueString, StringComparison.OrdinalIgnoreCase)); default: return true; } } #region IRouteConstraint Members bool IRouteConstraint.Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection) { return Match(httpContext, route, parameterName, values, routeDirection); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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