The type 'IEnumerable<>' is defined in an assembly that is not referenced

Question

I have added the following nuget package to my MVC 5 application X.PagedList.Mvc

I return the results in my controller/view as follows:

// Repo
public IPagedList<Post> GetPagedPosts(int pageNumber, int pageSize)
{
   var posts = _context.Post
      .Include(x => x.Category)
      .Include(x => x.Type);

   // Return a paged list
   return posts.ToPagedList(pageNumber, pageSize);

}

// View model
public class PostViewModel
{
   public IPagedList<Post> Posts { get; set; }
   ...
}

// Controller method
public ActionResult Index(int? page)
{

    int pageNumber = page ?? 1;
    int pagesize = 5;

    var posts = _PostRepository.GetPagedPosts(pageNumber, pagesize);

    var viewModel = new PostViewModel
    {
        Posts = posts,
        ...
    };

    return View(viewModel);
}

// View
@model MyApp.ViewModels.PostViewModel
@using X.PagedList.Mvc;
@using X.PagedList;

<p>Page @(Model.Posts.PageCount < Model.Posts.PageNumber ? 0 : Model.Posts.PageNumber) of @Model.Posts.PageCount </p>

But in my view I am getting the following error The type 'IEnumerable<>' is defined in an assembly that is not referenced. System.Runtime...

I have no project.json file in my application so what is this error?

Answer 1

Make sure you have the following lines in your Web.config file:

<compilation debug="true" targetFramework="4.6.1"> //don't need to change THIS line, just the content of this section
  <assemblies>
    <add assembly="System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
    <add assembly="System.Collections, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
  </assemblies>
</compilation>