asp.net – “MVC 3视图”中的当前上下文中不存在该名称“HTML”

@if(Request.IsAuthenticated) {
    <text>Welcome <b>@Context.User.Identity.Name</b>!
    [ @Html.ActionLink("Log Off","LogOff","Account") ]</text>
}
else {
    @:[ @Html.ActionLink("Log On","LogOn","Account") ]
}

像@Request和@Html这样的对象表示错误：当前上下文中不存在名称“HTML”.

@Context,@ViewBag,@Layout,@Url等也是一样.

看到：

image http://i56.tinypic.com/28s1smp.jpg

但代码正确编译没有错误.问题是我不能在视图中使用Intellisense与这些对象.是正常吗(我不这么认为).可能会发生什么？

我已经重新安装了MVC 3框架,但仍然发生.

注意：这是一个从头开始的新项目,而不是MVC 2迁移.这与Razor引擎和ASPX都发生.

这是Views文件夹中的Web.Config：

<?xml version="1.0"?>

<configuration>
  <configSections>
    <sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup,System.Web.WebPages.Razor,Version=1.0.0.0,Culture=neutral,PublicKeyToken=31BF3856AD364E35">
      <section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection,PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
      <section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection,PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
    </sectionGroup>
  </configSections>

  <system.web.webPages.razor>
    <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory,System.Web.Mvc,Version=3.0.0.0,PublicKeyToken=31BF3856AD364E35" />
    <pages pageBaseType="System.Web.Mvc.WebViewPage">
      <namespaces>
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Routing" />
      </namespaces>
    </pages>
  </system.web.webPages.razor>

  <appSettings>
    <add key="webpages:Enabled" value="false" />
  </appSettings>

  <system.web>
    <httpHandlers>
      <add path="*" verb="*" type="System.Web.HttpNotFoundHandler"/>
    </httpHandlers>

    <!--
        Enabling request validation in view pages would cause validation to occur
        after the input has already been processed by the controller. By default
        MVC performs request validation before a controller processes the input.
        To change this behavior apply the ValidateInputAttribute to a
        controller or action.
    -->
    <pages
        validateRequest="false"
        pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter,PublicKeyToken=31BF3856AD364E35"
        pageBaseType="System.Web.Mvc.ViewPage,PublicKeyToken=31BF3856AD364E35"
        userControlBaseType="System.Web.Mvc.ViewUserControl,PublicKeyToken=31BF3856AD364E35">
      <controls>
        <add assembly="System.Web.Mvc,PublicKeyToken=31BF3856AD364E35" namespace="System.Web.Mvc" tagPrefix="mvc" />
      </controls>
    </pages>
  </system.web>

  <system.webServer>
    <validation validateIntegratedModeConfiguration="false" />

    <handlers>
      <remove name="BlockViewHandler"/>
      <add name="BlockViewHandler" path="*" verb="*" preCondition="integratedMode" type="System.Web.HttpNotFoundHandler" />
    </handlers>
  </system.webServer>
</configuration>

谢谢！