Asp.net-Mvc

警告 - 項目更新後無法辨識 html.helpers

  • December 26, 2013

我最近將我的項目更新為 mvc 5、EF 6。我通過包控制台管理器（更新包）更新了所有包。

現在我在每個視圖/部分視圖/佈局中看到大量關於 html 助手的警告。

這些是一些錯誤：

  • 目前上下文中不存在名稱“ViewBag”
  • 目前上下文中不存在名稱“樣式”
  • 目前上下文中不存在名稱“腳本”
  • “System.Web.WebPages.Html.HtmlHelper”不包含“Partial”的定義，並且沒有擴展方法“Partial”接受“System.Web.WebPages.Html.HtmlHelper”類型的第一個參數（你是缺少 using 指令或程序集引用？）
  • “System.Web.WebPages.Html.HtmlHelper”不包含“ActionLink”的定義…
  • “System.Web.WebPages.Html.HtmlHelper”不包含“BeginForm”的定義…
  • “System.Web.WebPages.Html.HtmlHelper”不包含“AntiForgeryToken”的定義…

這是視圖/webconfig：

   <?xml version="1.0"?>
<configuration>
 <configSections>
   <sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
     <section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
     <section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
   </sectionGroup>
 </configSections>

 <system.web.webPages.razor>
   <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, 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.Optimization"/>
       <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>
   <pages
       validateRequest="false"
       pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"
       pageBaseType="System.Web.Mvc.ViewPage, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"
       userControlBaseType="System.Web.Mvc.ViewUserControl, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
     <controls>
       <add assembly="System.Web.Mvc, Version=5.0.0.0, Culture=neutral, 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>

這是全域網路配置：

  <?xml version="1.0" encoding="utf-8"?>
<configuration>
 <configSections>
   <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
 </configSections>
 <appSettings>
   <add key="webpages:Version" value="2.0.0.0" />
   <add key="webpages:Enabled" value="false" />
   <add key="PreserveLoginUrl" value="true" />
   <add key="ClientValidationEnabled" value="true" />
   <add key="UnobtrusiveJavaScriptEnabled" value="true" />
   <add key="CryptographyKey" value="a0fp3gLq" />
 </appSettings>
 <system.web>
   <compilation debug="true" targetFramework="4.5" />
   <httpRuntime targetFramework="4.5" />
   <authentication mode="Forms">
     <forms loginUrl="~/" timeout="10000" />
   </authentication>
   <pages>
     <namespaces>
       <add namespace="System.Web.Helpers" />
       <add namespace="System.Web.Mvc" />
       <add namespace="System.Web.Mvc.Ajax" />
       <add namespace="System.Web.Mvc.Html" />
       <add namespace="System.Web.Optimization" />
       <add namespace="System.Web.Routing" />
       <add namespace="System.Web.WebPages" />
     </namespaces>
   </pages>
   <profile defaultProvider="DefaultProfileProvider">
     <providers>
       <add name="DefaultProfileProvider" type="System.Web.Providers.DefaultProfileProvider, System.Web.Providers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/" />
     </providers>
   </profile>
   <membership defaultProvider="DefaultMembershipProvider">
     <providers>
       <add name="DefaultMembershipProvider" type="System.Web.Providers.DefaultMembershipProvider, System.Web.Providers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" />
     </providers>
   </membership>
   <roleManager defaultProvider="DefaultRoleProvider">
     <providers>
       <add name="DefaultRoleProvider" type="System.Web.Providers.DefaultRoleProvider, System.Web.Providers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/" />
     </providers>
   </roleManager>
   <sessionState mode="InProc" customProvider="DefaultSessionProvider">
     <providers>
       <add name="DefaultSessionProvider" type="System.Web.Providers.DefaultSessionStateProvider, System.Web.Providers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" />
     </providers>
   </sessionState>
 </system.web>
 <system.webServer>
   <validation validateIntegratedModeConfiguration="false" />
   <handlers>
     <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
     <remove name="OPTIONSVerbHandler" />
     <remove name="TRACEVerbHandler" />
     <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
   </handlers>
 </system.webServer>
 <runtime>
   <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
     <dependentAssembly>
       <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
       <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
     </dependentAssembly>
     <dependentAssembly>
       <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
       <bindingRedirect oldVersion="1.0.0.0-4.0.0.0" newVersion="4.0.0.0" />
     </dependentAssembly>
     <dependentAssembly>
       <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
       <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
     </dependentAssembly>
     <dependentAssembly>
       <assemblyIdentity name="EntityFramework" publicKeyToken="b77a5c561934e089" />
       <bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
     </dependentAssembly>
     <dependentAssembly>
       <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
       <bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
     </dependentAssembly>
     <dependentAssembly>
       <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" culture="neutral" />
       <bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
     </dependentAssembly>
     <dependentAssembly>
       <assemblyIdentity name="System.Net.Http.Formatting" publicKeyToken="31bf3856ad364e35" culture="neutral" />
       <bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
     </dependentAssembly>
     <dependentAssembly>
       <assemblyIdentity name="Antlr3.Runtime" publicKeyToken="eb42632606e9261f" culture="neutral" />
       <bindingRedirect oldVersion="0.0.0.0-3.5.0.2" newVersion="3.5.0.2" />
     </dependentAssembly>
   </assemblyBinding>
 </runtime>
 <entityFramework>
   <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
   <providers>
     <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
   </providers>
 </entityFramework>
</configuration>

我在您的全域 web.config 中立即看到兩個問題。

首先，這條線

<add key="webpages:Version" value="**2.0.0.0**" />

需要更新到這一行

<add key="webpages:Version" value="**3.0.0.0**" />

二、這幾行

<dependentAssembly>
 <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
 <bindingRedirect oldVersion="1.0.0.0-**2.0.0.0**" newVersion="**2.0.0.0**" />
</dependentAssembly>
<dependentAssembly>
 <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
 <bindingRedirect oldVersion="1.0.0.0-**4.0.0.0**" newVersion="**4.0.0.0**" />
</dependentAssembly>
<dependentAssembly>
 <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
 <bindingRedirect oldVersion="1.0.0.0-**2.0.0.0**" newVersion="**2.0.0.0**" />
</dependentAssembly>

需要更新到這些行

<dependentAssembly>
 <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
 <bindingRedirect oldVersion="1.0.0.0-**3.0.0.0**" newVersion="**3.0.0.0**" />
</dependentAssembly>
<dependentAssembly>
 <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
 <bindingRedirect oldVersion="1.0.0.0-**5.0.0.0**" newVersion="**5.0.0.0**" />
</dependentAssembly>
<dependentAssembly>
 <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
 <bindingRedirect oldVersion="1.0.0.0-**3.0.0.0**" newVersion="**3.0.0.0**" />
</dependentAssembly>

程序集版本需要與您升級到的版本相匹配。此外，在進行這些更改後，您可能需要在 VS 中進行清理/重建，以確保您已清除舊程序集。

引用自：https://stackoverflow.com/questions/20791890

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