ASP.NET MVC 2 System.Web.Mvc.dll conflict

Question

I have installed the ASP.NET MVC 2 RC and opened the default "example project", but get the following error:

Parser Error Message: The type 'System.Web.Mvc.ViewMasterPage' is ambiguous: it could come from assembly 'C:\WINDOWS\assembly\GAC_MSIL\System.Web.Mvc\2.0.0.0__31bf3856ad364e35\System.Web.Mvc.dll' or from assembly 'C:\Documents and Settings\sfent\My Documents\Visual Studio 2008\Projects\MvcApplication1\MvcApplication1\bin\System.Web.Mvc.DLL'. Please specify the assembly explicitly in the type name.

This appears to be a conflict between the GAC dll and the dll created and placed in the bin directory (which I thought was supposed to be used in preference to the GAC version)

I have Googled this issue and have found similar problems, but relating to incorrect namespacing. This is the un-altered example application that comes bundled with the MVC framework.

I have also tried removing the framework entirely and re-installing the RC, but to no avail.

All suggestions appreciated.

Answer 1

Does your project reference both v1 and v2 of the framework? Also, why not delete the matching dll that's been copied locally?

Answer 2

Okay. I have performed another uninstall, got the latest RC from MS and re-installed and the problem has gone away.

This was the source for the download, which is strangely tricky to find if you search on MSDN:

http://www.microsoft.com/downloads/details.aspx?familyid=3B537C55-0948-4E6A-BF8C-AA1A78878DA0&displaylang=en

Answer 3

Hello Schnee,

the problem might be that the Reference in your Project is still pointing to the old Version of the dll (v1.0). Delete the reference and add a new one to version (v2.0).

You find that hint as well in the release notes of MVC2 RC:

"Open the project using Visual Studio, and in Solution Explorer, expand the References node. Delete the reference to System.Web.Mvc (which points to the version 1.0 assembly). Add a reference to System.Web.Mvc (v2.0.0.0)."

Cheers, Damrod