表示一个特性,该特性指定操作方法将响应的 HTTP 谓词。
类签名:
[AttributeUsageAttribute(AttributeTargets.Method, AllowMultiple = false, Inherited = true)] public sealed class AcceptVerbsAttribute : ActionMethodSelectorAttribute
这是个特性类,可以作为特性修饰Action方法,这个特性指定了可以访问Action方法的HttpMethod方法(HttpMethod也被称为HttpVerb),常见的HttpMehod有GET和POST,如果访问Action的HttpMethod不在特性指定的范围内,将返回HTTP 404错误。
从这个类的源代码中可以看出,该类有两个构造函数,分别是接受HttpVerb枚举和一组变参String,其中HttpVerb枚举是Flag特性的,也就是说可以使用"|"操作符来指定多个参数。
例如让某个Action可同时接受Get和Post的Http访问,可以按下面的代码实现:
[AcceptVerbs(HttpVerbs.Post|HttpVerbs.Get)] public ActionResult About() { return View(); }
也可以按下面的代码实现:
[AcceptVerbs("POST","GET")] public ActionResult About() { return View(); }
下面是摘自CodePlex的该类的源代码:
/* **************************************************************************** * * Copyright (c) Microsoft Corporation. All rights reserved. * * This software is subject to the Microsoft Public License (Ms-PL). * A copy of the license can be found in the license.htm file included * in this distribution. * * You must not remove this notice, or any other, from this software. * * ***************************************************************************/ namespace System.Web.Mvc { using System; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Diagnostics.CodeAnalysis; using System.Linq; using System.Reflection; using System.Web.Mvc.Resources; [SuppressMessage("Microsoft.Design", "CA1019:DefineAccessorsForAttributeArguments", Justification = "The accessor is exposed as an ICollection.")] [AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = true)] public sealed class AcceptVerbsAttribute : ActionMethodSelectorAttribute { public AcceptVerbsAttribute(HttpVerbs verbs) : this(EnumToArray(verbs)) { } public AcceptVerbsAttribute(params string[] verbs) { if (verbs == null || verbs.Length == 0) { throw new ArgumentException(MvcResources.Common_NullOrEmpty, "verbs"); } Verbs = new ReadOnlyCollection(verbs); } public ICollectionVerbs { get; private set; } private static void AddEntryToList(HttpVerbs verbs, HttpVerbs match, ListverbList, string entryText) { if ((verbs & match) != 0) { verbList.Add(entryText); } } internal static string[] EnumToArray(HttpVerbs verbs) { ListverbList = new List(); AddEntryToList(verbs, HttpVerbs.Get, verbList, "GET"); AddEntryToList(verbs, HttpVerbs.Post, verbList, "POST"); AddEntryToList(verbs, HttpVerbs.Put, verbList, "PUT"); AddEntryToList(verbs, HttpVerbs.Delete, verbList, "DELETE"); AddEntryToList(verbs, HttpVerbs.Head, verbList, "HEAD"); return verbList.ToArray(); } public override bool IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo) { if (controllerContext == null) { throw new ArgumentNullException("controllerContext"); } string incomingVerb = controllerContext.HttpContext.Request.HttpMethod; return Verbs.Contains(incomingVerb, StringComparer.OrdinalIgnoreCase); } } }
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