System.Web.WebPages.Razor.Configuration.HostSection 无法强制转换

[A]System.Web.WebPages.Razor.Configuration.HostSection 无法强制转换为 [B]System.Web.WebPages.Razor.Configuration.HostSection。类型 A 源自“System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35”(在上下文“Default”中的“C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll”位置处)。类型 B 源自“System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35”(在上下文“Default”中的“C:\Users\xxx\AppData\Local\Temp\Temporary ASP.NET Files\root\2dc07fd0\56eac999\assembly\dl3\c97d012c\e7fa0063_88b3d201\System.Web.WebPages.Razor.dll”位置处)。

提示了Razor版本问题，打开view下的webconfig 纠正下面configSections的razor版本到3.0.0.0，如红字所示

<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>