Razor Views not seeing System.Web.Mvc.HtmlHelper

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I ran into this issue with a Web Application – my .cshtml files got stuck on the System.Web.WebPages.WebViewPage base class when I needed the System.Web.Mvc.WebViewPage.

First, ensure your ~/Views/web.config file has the correct pageBaseType. In my case, I set to System.Web.Mvc.WebViewPage.

<configuration>
  <system.web.webPages.razor>
    <pages pageBaseType="System.Web.Mvc.WebViewPage">
      <!-- ... -->
    </pages>
  </system.web.webPages.razor>
</configuration>

Then, importantly, some people have found this is key if the above is already good:

  1. Run a clean on the solution
  2. Unload the project with the issues
  3. Delete the .user file that Visual Studio generated next to the project.
  4. Reload the project with the issues
  5. Build the solution

For VS2015, the .user and .sln files have moved to the .vs hidden folder that is created next to the .sln file. However, from comments below, the error messages imply to me that the tooling is using the wrong version of MVC entirely, and deleting this folder does not fix the issue. To my knowledge, there is not a known solution.

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