System web mvc missing

Question

We have an old ASP NET MVC 3 Web Application  building in VS2010  that fails to compile  since last week s security update   The problem is that the reference to System Web Mvc dll is broken    When I open the solution file on our build machine  where the security update has not run  and open the properties dialog for References- System Web MVC  it looks just fine    Path is C  Program Files Microsoft ASP NET ASP NET MVC 3 Assemblies System Web Mvc dll Version is 3 0 0 0  But when I open the solution file on a dev machine where the security update has run  References- System Web MVC is flagged as missing  If I remove it  and try to add it back using VS2010 s Add Reference dialog  it doesn t show   Wandering around the web has led me to suggestions involving updating MVC using NuGet  We didn t use NuGet  in our VS2010 projects  so that doesn t seem quite right  for this situation  I tried it anyway  and ended up with half-a-dozen missing references   When I look at the properties for  C  Program Files Microsoft ASP NET ASP NET MVC 3 Assemblies System Web Mvc dll  in Windows Explorer  on the build machine I see version 3 0 0 0   When I look at the properties on the dev machine  I see version 3 0 50813 1   What I need is a way to change the way I build and run so that I can build and run regardless of which of these two DLLs in installed in the  NET 3 0 framework   Ideas   What I have tried that didn t work  First attempt - if the assembly is missing  add it   I deleted the old missing reference  Then I copied the DLL from the  ASP NET MVC3 Assemblies  folder  into a folder in my project  Set it as  Copy Always   and added it as a reference   With that  the project would compile in VS2010  but when I d try to precompile the pages with aspnet compiler  I got warnings    0   warning CS1702  Assuming assembly reference  System Web Mvc  Version 3 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  matches  System Web Mvc  Version 3 0 0 1  Culture neutral  PublicKeyToken 31bf3856ad364e35   you may need to supply runtime policy   So far  I ve been able to manage to avoid understanding runtime policies  but I tried to add this  in the web config    lt runtime gt       lt assemblyBinding xmlns  urn schemas-microsoft-com asm v1  gt           lt dependentAssembly gt               lt assemblyIdentity name  System Web Mvc  publicKeyToken  31bf3856ad364e35    gt               lt bindingRedirect oldVersion  1 0 0 0-3 0 0 0  newVersion  3 0 0 1    gt           lt  dependentAssembly gt       lt  assemblyBinding gt   lt  runtime gt    Tried it again  and got the same warnings   My question is - do I still have a problem   Or will my  resolve it  despite the warnings

User · Answer

In my case I had all of the proper references in my project  I found that by building the solution the nuget packages were automatically restored

User · Answer

Had this problem in vs2017  I already got MVC via nuget but System Web Mvc didn t appear in the  Assemblies  list under  Add Reference    The solution was to select  Extensions  under  Assemblies  in the  Add Reference  dialog

User · Answer

The sample mvcmusicstore codeplex com opened in vs2015 missed some references  one of them System web mvc   The fix for this was to remove it from the references and to add a reference  choose Extentions under Assemblies  there you can find and add System Web Mvc    The other assemblies I added with the nuget packages

User · Answer

in VS 2017 I cleaned the solution and rebuilt it and that fixed it

User · Answer

I have the same situation  Visual Studio 2010  no NuGet installed  and an ASP NET application using System Web Mvc version 3    What worked for me  was to set each C  project that uses System Web Mvc  to go to References in the Solution Explorer  and set properties on System Web Mvc  with Copy Local to true  and Specific Version to false - the last one caused the Version field to show the current version on that machine

User · Answer

Easiest way to solve this problem is install ASP NET MVC 3 from Web Platforms installer     http   www microsoft com web downloads   Or by using Nuget command  Install-Package Microsoft AspNet Mvc -Version 3 0 50813 1

User · Answer

Add the reference again from   packages Microsoft AspNet Mvc  version  lib net45 System Web Mvc dll

User · Answer

Get the latest version of MVC3 via NuGet   Open your project in Dev Studio  Open the Package Manager Console tab at the bottom of Dev Studio   Then use this command     PM gt  Install-Package Microsoft AspNet Mvc -Version 3 0 50813 1   If you click the tab key after  -Version  you will get a list of all of the available versions     If you have an old version of NuGet you may get an error indicating you have to upgrade it   If so  open Tools- Extension Manager to install the latest version of NuGet   Note  you will need to run Dev Studio as Administrator before you can install NuGet     Installing MVC3 should update Web config in your project    lt assemblyBinding xmlns  urn schemas-microsoft-com asm v1  gt     lt dependentAssembly gt       lt assemblyIdentity name  System Web Mvc  publicKeyToken  31bf3856ad364e35    gt       lt bindingRedirect oldVersion  0 0 0 0-3 0 0 1  newVersion  3 0 0 1    gt     lt  dependentAssembly gt   lt  assemblyBinding gt

User · Answer

Just in case someone is a position where he get s the same error  In my case downgrading Microsoft AspNet Mvc and then upgrading it again helped  I had this problem after installing Glimpse and removing it  System Web Mvc was references wrong somehow  cleaning the solution or rebuilding it didin t worked in my case  Just give it try if none of the above answers works for you

User · Answer

MVC 5  C  Program Files  x86  Microsoft ASP NET ASP NET Web Stack 5 Packages  Microsoft AspNet Mvc 5 0 0 lib net45 System Web Mvc dll  MVC 4  C  Program Files  x86  Microsoft ASP NET ASP NET MVC 4 Assemblies System Web Mvc dll  MVC 3  C  Program Files  x86  Microsoft ASP NET ASP NET MVC 3 Assemblies System Web Mvc dll  MVC 2  C  Program Files  x86  Microsoft ASP NET ASP NET MVC 2 Assemblies System Web Mvc dll  Where can I find System Web MVC dll in a system where MVC 3 is installed

[c#] System.web.mvc missing

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