Razor-based view doesn t see referenced assemblies

Question

I m attempting to create a strongly-typed view based on a class from another assembly  For whatever reason though  my Razor view doesn t seem to have any visibility of other assemblies referenced on my project  e g    model MyClasses MyModel   results in the error in Visual Studio 2010   The type or namespace name MyClasses could not be found  are you missing a using directive or an assembly reference      The same class referenced in the standard view engine works fine  I have the same trouble trying to reference the class in the body of my view   Am I missing something about Razor or do I need to reference the assembly some other way

User · Answer

In ASP NET Core MVC the solution is to add a using in  ViewImports cshtml  instead of putting it web config in the View folder when working with ASP NET MVC 5    ViewImports cshtml   using mySolution  using mySolution ViewModels     lt -- Add this  and place your ViewModel  e g  LoginViewModel  in here   addTagHelper    Microsoft AspNetCore Mvc TagHelpers   View   model LoginViewModel    Add to  ViewImports to make this line work  lt div gt This is the View for the login screen  lt  div gt

User · Answer

well  for me it was different  I was missing assembly of my console application project with MVC project  So  adding reference was not enough    well this might help someone else  go to root web config file system web -  compilation -  add your project reference like this     lt assemblies gt       lt add assembly  Your Namespace  Version 1 0 0 0  Culture neutral  PublicKeyToken null   gt    lt  assemblies gt

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Your Project FOLDER name needs to be the same  If your Project or Solution name is different  then MVC will hurt you    Example   If you create a new Application and it gets the default name Webapplicaiton1  then this namespace will be created  So  let us say that you dont want to have this namespace  so from the VS you change everywhere you can see to  MyNamespace   You also search and replace all code from   Webapplication1  and replace it with  MyNamespace    This also changes web config file  so that it inculdes   Now everything will work  except Razor views    RazorViews cannot find it  because there is some kind of strange dependency on the FOLDERNAME of the project  It is terrible design    I have tested this semi-thoroughly by copying my files into a new solution  and the only difference being the foldername

User · Answer

For me I was referencing a project that was a console application  It was set to build as an exe  console application  instead of class library  DLL   When I changed this I was able to see the models from that separate project no problem

User · Answer

I was getting the same error while trying to use Smo objects in a Razor view  Apparently this is because Razor can t find the DLLs referenced in the project  I resolved this by setting  Copy Local  to true for all Smo dlls  however there might be a better solution  see Czechdude s link above   using and web config edits are useless because they are only needed if you wish to omit the namespace part from the type names  for instance Server instead of Microsoft SqlServer Management Smo Server

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In addition to making the web config changes for  lt assemblies gt  and  lt namespaces gt   I found that GAC ing the assembly made a big difference   You can apply culture and public key token like any core  NET assembly that is registered globally   Some may shudder at the mention of the GAC   But as a BizTalk developer I ve grown to embrace it

User · Answer

None of the above worked for me either    Dlls were set to Copy Local Adding namespaces to both web configs did nothing Adding assembly references to system web compilation assemblies also did not help  although I have not removed these references  so it may be that they are needed too    But I finally found something that worked for me   It was because I had my Build Output going to bin Debug  for Debug configuration and bin Release  for Release configuations  As soon as I changed the Build Configuation to  bin   for All configuations  as per image below  then everything started working as it should       I have no idea why separating out your builds into Release and Debug folders should cause Razor syntax to break  but it seems to be because something couldn t find the assemblies  For me the projects that were having the razor syntax issues are actually my  razor library  projects  They are set as Application Projects however I use them as class libraries with RazorGenerator to compile my views  When I actually tried to run one of these projects directly it caused the following Configuration error      Could not load file or assembly  System Web Helpers  Version 3 0 0 0    Culture neutral  PublicKeyToken 31bf3856ad364e35  or one of its   dependencies  The system cannot find the file specified    This lead me to trying to change the Build Output  as I notice that for all web projects the Build Output seems to always be directly to the bin folder  unlike the default for class libraries  which have both release and debug folders

User · Answer

I also had the same issue  but the problem was with the Target framework of the assembly   The referenced assembly was in  NET Framework 4 6 where the project has set to  NET framework 4 5   Hope this will help to someone who messed up with frameworks

User · Answer

I was getting a similar error after moving my dev machine from Win7 32bit to Win7 64bit  Error message        Web Views Login cshtml  ASP net runtime error   A System Web WebPages Razor Configuration HostSection cannot be cast to  B System Web WebPages Razor Configuration HostSection  Type A originates from System Web WebPages Razor  Version 1 0 0 0     Type B originates from     Version 2 0 0 0  Turns out I had both versions in the GAC  The View web config referenced v1 but the app was referencing v2  Removed the referenced assemblies and re-added v1  of System Web WebPages Razor  etc

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I had the same problem  MVC3 Project MyCore Web was referencing to MyCore DBLayer namespace from another project in the same solution  with assembly name MyCoreDBLayer   All objects from MyCore DBLayer worked perfectly in Controllers and Models but failed in Razor views with an error  The type or namespace name  DBLayer  does not exist in the namespace  MyCore   are you missing an assembly reference    which was obviously not the case    Copy Local option was set to true    Adding  using     statements in Razor views was useless  Adding namespaces to system web webPages razor section was useless as well   Adding assembly referecene to system web compilation assemblies section of the root web config file fixed the issue  The section now looks like    lt system web gt       lt compilation debug  true  targetFramework  4 0  gt         lt assemblies gt           lt add assembly  System Web Abstractions  Version 4 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35    gt           lt add assembly  System Web Helpers  Version 1 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35    gt           lt add assembly  System Web Routing  Version 4 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35    gt           lt add assembly  System Web Mvc  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35    gt           lt add assembly  System Web WebPages  Version 1 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35    gt             lt add assembly  MyCoreDBLayer    gt           lt  assemblies gt       lt  compilation gt       lt  system web gt    Omitting version  culture  token was OK for now  but should be fixed in the future

User · Answer

in spacename models  yourClassModel  add public before name class  public class yourClassModel      prop

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This solution worked for me  It s funny  but works   I edited the view pages and copied the contents and pasted in it i didn t change any content of the views  but just edited so the visual studio could do it s thing to track the pages  and afterwards every thing started working  Solution - Just edit the pages and replace with the same pages  Worked for me

User · Answer

include the entire namespace   model namespace myclasses mymodel

User · Answer

In my case  the separate project that contained the namespace was a Console Application  Changing it to a Class Library fixed the problem

User · Answer

In my case the package I tried to use was referencing  net standard 2 1 while my razor class library project was set to 2 0

User · Answer

None of these https   stackoverflow com a 7597360 808128 do work for me  Even  adding assembly referecene to system web compilation assemblies section of the root web config file   So the two ways remains for me  1  to add a public wrap class for my assembly that Razor code can access to this assembly through this wrap  2  just add assembly logic to a public class in the same assembly where the Razor s code is located

User · Answer

There is a new configuration section that is used to reference namespaces for Razor views   Open the web config file in your Views folder  and make sure it has the following    lt configuration gt       lt configSections gt           lt sectionGroup name  system web webPages razor  type  System Web WebPages Razor Configuration RazorWebSectionGroup  System Web WebPages Razor  Version 1 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  gt               lt section name  host  type  System Web WebPages Razor Configuration HostSection  System Web WebPages Razor  Version 1 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  requirePermission  false    gt               lt section name  pages  type  System Web WebPages Razor Configuration RazorPagesSection  System Web WebPages Razor  Version 1 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  requirePermission  false    gt           lt  sectionGroup gt       lt  configSections gt        lt system web webPages razor gt           lt host factoryType  System Web Mvc MvcWebRazorHostFactory  System Web Mvc  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35    gt           lt pages pageBaseType  System Web Mvc WebViewPage  gt               lt namespaces gt                   lt add namespace  System Web Mvc    gt                   lt add namespace  System Web Mvc Ajax    gt                   lt add namespace  System Web Mvc Html    gt                   lt add namespace  System Web Routing    gt                   lt add namespace  SquishIt Framework    gt                   lt add namespace  Your Namespace Etc    gt               lt  namespaces gt           lt  pages gt       lt  system web webPages razor gt   lt  configuration gt    Alternatively  you can add using statements to your shared layout    using Your Namespace Etc   lt  DOCTYPE html gt   lt head gt         After editing the Web config  restart Visual Studio to apply the changes

User · Answer

Try adding the namespace your MyClasses is in to the web config under    lt pages gt      lt namespaces gt  lt  namespaces gt    lt  pages gt

User · Answer

In my case  I was using Razor Views outside of a web application  Copying the dlls to my bin folder in solution solved the problem

User · Answer

You seem to be looking for this answer  https   stackoverflow com a 4136773 176877  That is  open the inner Views Web Config  NOT the root one   and add the namespace under the Pages tag    lt system web webPages razor gt     lt host factoryType  System Web Mvc MvcWebRazorHostFactory     gt     lt pages pageBaseType  System Web Mvc WebViewPage  gt       lt namespaces gt         lt add namespace  System Web Mvc    gt                   lt add namespace  System Web Routing    gt         lt  -- Your namespace here -- gt       lt  namespaces gt    Save that  then close and reopen the Razor file   If you re using Areas you ll need to do this for each Web Config in each Area   Visual Studio has gotten buggier over the years so it may require closing the Razor file running a Debug build then reopening the Razor file  or may in the worst require restarting Visual Studio  But ultimately it will present the Razor file to you as though everything in that namespaces list was in  using statements at the top of all your Views

[asp.net-mvc] Razor-based view doesn't see referenced assemblies

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