Visual Studio .net core tag helpers not working

Question

Well, lets get down to it. I'm using Visual Studio 2015 and ASP.NET core tag helpers have completely stopped working, no idea why as I've not changed anything. I was in work one day, they worked fine, then I came in the next day and now no ASP.NET core web project at all shows any tag helpers!?! I've tried creating a fresh new ASP.NET core mvc project and they don't work there either!!! I'm completely stuck, is there some setting somewhere that completely turns them off in Visual Studio?

Note that I've checked everything that usually causes this problem according to most other posts. My _ViewImports has the line:-

@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

and here is a complete project.json file from a fresh project I just created and made NO changes to at all:-

{
  "dependencies": {
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",
    "Microsoft.AspNetCore.Mvc": "1.0.1",
    "Microsoft.AspNetCore.Razor.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "Microsoft.AspNetCore.Routing": "1.0.1",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.Extensions.Logging": "1.0.0",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.Extensions.Logging.Debug": "1.0.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0"
  },

  "tools": {
    "BundlerMinifier.Core": "2.0.238",
    "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
  },

  "frameworks": {
    "net452": { }
  },

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "**/*.cshtml",
      "appsettings.json",
      "web.config"
    ]
  },

  "scripts": {
    "prepublish": [ "bower install", "dotnet bundle" ],
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }
}

Also, all the _Layout views and other views have completely lost their highlighting that used to appear. No one else I've found on the internet so far seems to be having this problem, don't suppose anyone else has any ideas?

EDIT:

One of the answers below has solved this for new projects in a new solution but I'm still having problems with existing solutions/projects. Here's the project file contents from one of these existing projects, hopefully someone can spot something here...

{
  "dependencies": {
    "BundlerMinifier.Core": "2.2.306",
    "Configuration.Web": "1.0.0-*",
    "Microsoft.AspNetCore.Diagnostics": "1.1.0",
    "Microsoft.AspNetCore.Mvc": "1.1.0",
    "Microsoft.AspNetCore.Mvc.TagHelpers": "1.1.0",
    "Microsoft.AspNetCore.Razor.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "Microsoft.AspNetCore.Routing": "1.1.0",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.1.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
    "Microsoft.AspNetCore.StaticFiles": "1.1.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.1.0",
    "Microsoft.Extensions.Configuration.Json": "1.1.0",
    "Microsoft.Extensions.Logging": "1.1.0",
    "Microsoft.Extensions.Logging.Console": "1.1.0",
    "Microsoft.Extensions.Logging.Debug": "1.1.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.1.0",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.1.0"
  },

  "tools": {
    "Microsoft.AspNetCore.Razor.Tools":  "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
  },

  "frameworks": {
    "net452": {
      "dependencies": {
        "Aristotle.Service": {
          "target": "project"
        },
        "Infrastructure": {
          "target": "project"
        }
      }
    }
  },

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "**/*.cshtml",
      "appsettings.json",
      "web.config"
    ]
  },

  "scripts": {
    "prepublish": [ "bower install", "dotnet bundle" ],
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }
}

I've updated all packages using NuGet to latest versions...

Answer 1

I've finally fixed this, but have no idea why the fixed works or why it stopped working in the first place but...

in _ViewImports the line which is:-

@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

I've changed to include quotes:-

@addTagHelper "*, Microsoft.AspNetCore.Mvc.TagHelpers"

Then I did a rebuild and its working again!?! All the 'asp-' attributes are also now highlighted as they were before. Why?!? Eh?!?

Stranger still, if I remove the quotes and rebuild, it still works! Well, at least until my colleagues get the file out of source control, they have to put the quotes back in!!

Figure that one out...

Answer 2

For anyone meet the same problem, please check the location of the _ViewImports.cshtml, It must be in the same folder of your Views. For example, I have created a project that already have the _ViewImports.cshtml file in Pages folder, but I create and use my view files located in another folder, so ASP.NET can't find the _ViewImports.cshtml for our views.

With anyone have issue finding the project.json, you can right click at the project and choose Manage Nuget Packages then install the Microsoft.AspNetCore.Mvc.TagHelpers.

Hope these advices can help everyone.