手动将MVC web应用从%3升级到% 4，无法添加API控制器

Question

我最近在MVC4中创建了一个新的web应用程序，并复制了所有文件，最后合并了web.config，从而将我的web应用程序从MVC3升级到了4。所有这些都在现有的web应用上运行得很好，但是我今天刚刚注意到一个非常奇怪的错误--如果我试图用默认的虚拟实现创建一个新的API控制器，然后浏览到那个api (例如/api/events)，我得到一个Could not load type错误。奇怪的是，如果我重新构建应用程序，并再次点击URL，它抱怨的似乎是一个不同的程序集，主要是这两个程序集之间的交替：

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, Culture=neutral, 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看起来包含了所有正确的部分：

  <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" />

我甚至尝试过从一个新的mvc4 web应用程序中用“普通”程序复制我的web.config，仍然给出同样的错误(无法加载文件或程序集Microsoft.Scripting)。

Answer 1

尝试从web.config中删除这些行

<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>