asp.net – 手动将MVC Web应用程序从3升级到4,无法添加API控制器

我最近通过在MVC4中创建一个新的Web应用程序,并将所有文件复制完毕,最后合并web.config,将我的Web应用程序从MVC3升级到了4.一切都适用于现有的网络应用程序,但是我今天刚刚注意到一个非常奇怪的错误 – 如果我尝试使用默认的虚拟实现创建一个新的API控制器,然后浏览到该api(例如/ api / events),我得到一个无法加载类型错误.奇怪的是,如果我重建应用程序,并再次点击URL,它似乎是一个不同的程序集,它主要是在这两个之间交替：

Could not load type 'System.Web.Razor.Parser.SyntaxTree.CodeSpan' from assembly 'System.Web.Razor,Version=2.0.0.0,Culture=neutral,PublicKeyToken=31bf3856ad364e35'.

和

Could not load file or assembly 'Microsoft.Scripting,Version=1.1.0.20,PublicKeyToken=7f709c5b713576e1' or one of its dependencies. The system cannot find the file specified.

我的web.config包含以下程序集绑定信息：

<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="0.0.0.0-4.0.0.0" 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="FluentValidation" publicKeyToken="a82054b837897c66" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-3.2.0.0" newVersion="3.2.0.0" />-->
        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" />
        <bindingRedirect oldVersion="0.0.0.0-4.0.8.0" newVersion="4.0.8.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Razor" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>

而且我的packages.config看起来好像包含了所有正确的位：

<package id="AspNetMvc" version="4.0.20126.16343" />
  <package id="AspNetRazor.Core" version="2.0.20126.16343" />
  <package id="AspNetWebApi" version="4.0.20126.16343" />
  <package id="AspNetWebApi.Core" version="4.0.20126.16343" />
  <package id="AspNetWebPages.Core" version="2.0.20126.16343" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" />
  <package id="Microsoft.Web.Optimization" version="1.0.0-beta" />
  <package id="System.Net.Http" version="2.0.20126.16343" />
  <package id="System.Net.Http.Formatting" version="4.0.20126.16343" />
  <package id="System.Web.Http.Common" version="4.0.20126.16343" />
  <package id="System.Web.Providers" version="1.1" />
  <package id="System.Web.Providers.Core" version="1.0" />

我甚至尝试使用来自新的mvc4网络应用程序的“vanilla”复制我的web.config,这仍然给我同样的错误(无法加载文件或程序集Microsoft.Scripting)

<dependentAssembly>
  <assemblyIdentity name="System.Web.Razor" publicKeyToken="31bf3856ad364e35" culture="neutral" />
  <bindingRedirect oldVersion="0.0.0.0-2.0.0.0" newVersion="2.0.0.0" />
</dependentAssembly>