CODEWITHSUNDEEP
asp.net-mvc
mike nelson
mike nelson

Reputation: 22136

The type 'System.Web.Mvc.ViewPage' is ambiguous

This problem occurred after upgrading ASP.NET MVC versions.

The type 'System.Web.Mvc.ViewPage' is ambiguous: it could come from assembly...

Upvotes: 10

Views: 8614

Answers (3)

Eric Gontier
Eric Gontier

Reputation: 131

This solved the thing for me ...

 <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Abstractions" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Routing" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="0.0.0.0-4.0.0.1" newVersion="4.0.0.1" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>

Upvotes: 2

Tommy
Tommy

Reputation: 39807

I see that you have provided yourself an answer, but another solution is to update your web.config with a <runtime> element that redirects dependent assemblies and points to the correct one:

 <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>

Note that updating your project from NuGet does the same thing for you automatically for most assemblies.

Upvotes: 12

mike nelson
mike nelson

Reputation: 22136

In solution explorer, click on References > System.Web.Mvc. Click properties and set Copy Local = True.

This way you will be sure to get the correct version of MVC in your project and not rely on whatever version(s) are installed in the GAC. This approach also enables you to bin-deploy the MVC DLL.

Upvotes: 5

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