Question

我们有一个ASP.NET MVC项目，其中包含多个使用相同名称的方法。为了区分它们，我们创建了一个ActionMethodSelectorAttribute，以便查看路由并确定应该使用哪种方法。这在开发中运行良好，但一旦将其部署到生产IIS 7服务器，我们就会收到此消息。

System.Reflection.AmbiguousMatchException: The current request for action 'Delete' on controller type 'OperationsController' is ambiguous between the following action methods:
System.Web.Mvc.ActionResult Delete(PermissionArea, PermissionPost) on type OperationsController
System.Web.Mvc.ActionResult Delete(PermissionArea, PermissionPost, PermissionEntity`1[Comment]) on type OperationsController
   at System.Web.Mvc.ReflectedControllerDescriptor.FindAction(ControllerContext controllerContext, String actionName)
   at System.Web.Mvc.ControllerActionInvoker.FindAction(ControllerContext controllerContext, ControllerDescriptor controllerDescriptor, String actionName)
   at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
   at System.Web.Mvc.Controller.ExecuteCore()
   at System.Web.Mvc.MvcHandler.<>c__DisplayClass8.<BeginProcessRequest>b__4()
   at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass1.<MakeVoidDelegate>b__0()
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

该属性如下所示。

public class StrictRouteMatchingAttribute : ActionMethodSelectorAttribute
    {
        private List<string> ignoreList = new List<string>()
                                              {
                                                  "action",
                                                  "controller"
                                              };

        private List<string> matchList = new List<string>();

        public StrictRouteMatchingAttribute()
        {

        }

        public StrictRouteMatchingAttribute(string[] ValuesToMatch)
        {
            matchList.AddRange(ValuesToMatch.Select(x => x.Trim().ToLower()));
        }

        public override bool IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo)
        {
            var filteredList = controllerContext.RequestContext.RouteData.Values.Keys.Where(x => !ignoreList.Contains(x.ToLower()));
            var matches = filteredList.Intersect(matchList);
            var extras = filteredList.Where(x => !matchList.Contains(x.ToLower()));

            if (matches.Count() == matchList.Count() && extras.Count() == 0)
            {
                return true;
            }

            return false;
        }
    }

现在已经使用system.webServer配置了web.config。

<system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <modules runAllManagedModulesForAllRequests="true">
      <add name="Elmah.ErrorLog" type="Elmah.ErrorLogModule, Elmah" preCondition="managedHandler" />
      <!--<add name="Elmah.ErrorFilter" type="Elmah.ErrorFilterModule" preCondition="managedHandler" />-->
      <!--<add name="Elmah.ErrorMail" type="Elmah.ErrorMailModule" preCondition="managedHandler" />-->
    </modules>
    <handlers>
      <add name="dotless" type="dotless.Core.LessCssHttpHandler,dotless.Core" path="*.less" verb="*" />
      <remove name="MvcHttpHandler" />
      <remove name="UrlRoutingHandler" />
      <add name="MvcHttpHandler" preCondition="integratedMode" verb="*" path="*.mvc" type="System.Web.Mvc.MvcHttpHandler, System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL" />
      <add name="Elmah" path="elmah.axd" verb="POST,GET,HEAD" type="Elmah.ErrorLogPageFactory, Elmah" preCondition="integratedMode" />
    </handlers>
  </system.webServer>

为什么使用内置的Web服务器可以正常工作，但在发布时出现问题？

感谢。

Answer 1

这可能是一个黑暗的镜头，但这些链接可能会帮助你

Can you overload controller methods in ASP.NET MVC?

How can I avoid AmbiguousMatchException between two controller actions?

Answer 2

ActionMethodSelectorBase.RunSelectionFilters将返回所有匹配的操作，因此您需要添加可能使其他属性匹配无效的其他属性。

在我的场景中，我有1个[HttpPost]和2个[HttpGet]动作，1个使用自定义ActionMethodSelectorAttribute，从默认方法中删除[HttpGet]就足以让它不被动作过滤器返回，它是非帖子时默认或我的选择器无效。

ActionMethodSelectorAttribute不适用于IIS 7

2 个答案: