在Web控件/頁面導致VS 2010智能感知失敗的錯誤

Question

我有一個最近從VS2008轉換到VS2010的Web應用程序項目，它不使用.Net 4.0（3.5代替），但每當我打開標記頁面或控制它顯示以下錯誤，並隨後禁用智能感知：

http://www.kompeller.co.uk/images/vs2010_error.png

線12在我的web.config看起來是這樣的：

<sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> 
    <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> 
    <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" /> 
    <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> 
     <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere" /> 
     <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" /> 
     <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" /> 
     <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" /> 
    </sectionGroup> 
    </sectionGroup> 
</sectionGroup> 

該應用程序被配置爲從IIS上運行我的機器，它沒有標準因此它不會從其他web.config繼承。

我到處尋找解決方案，它將我推上了牆！

由於

Answer 1

好的，我終於Ÿ跟蹤它的基礎上，詹姆斯的建議，即重複的可能不是在該行，這是有問題的配置：

 <dependentAssembly> 
    <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35" culture="neutral"/> 
    <bindingRedirect oldVersion="1.0.0.0-3.5.0.0" newVersion="3.5.0.0"/> 
    </dependentAssembly> 
    <dependentAssembly> 
    <assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35" culture="neutral"/> 
    <bindingRedirect oldVersion="1.0.0.0-3.5.0.0" newVersion="3.5.0.0"/> 
    </dependentAssembly> 

我刪除了這一點，一切都很好！

Answer 2

問題可能不完全上線12的錯誤非常明確指出System.Web.Extensions在web.config雖然定義了兩次。只需搜索System.Web.Extensions的所有實例並刪除重複。

檢查assemblies部分，並確保有沒有重複：

<compilation debug="true"> 
    <assemblies> 
    <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" /> 
    <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> 
    <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" /> 
    <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" /> 
    <add assembly="System.Web.Extensions.Design, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> 
    <add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" /> 
    <add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" /> 
    <add assembly="System.Drawing.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />  
     <add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> 
    </assemblies> 
</compilation> 

檢查pages/controls部分，並確保有沒有重複：

<pages> 
    <controls> 
     <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> 
     <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> 
     ... 

檢查httpHandlers部分：

<httpHandlers> 
    <remove verb="*" path="*.asmx"/> 
    <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> 
    ...