Error Upgrading from ASP.NET 5 Beta 4 to Beta 5

Question

I have followed the steps here to upgrade from ASP.NET 5 Beta 4 to Beta 5 but am getting an error at runtime when calling application.UseBrowserLink();:

An exception of type 'System.TypeLoadException' occurred in mscorlib.dll but was not handled in user code

Additional information: Could not load type 'Microsoft.AspNet.Builder.IApplicationBuilder' from assembly 'Microsoft.AspNet.Http, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.

These are the steps I followed:

1. Had VS 2015 RC already installed.
2. From PowerShell run: $env:DNX_FEED="https://www.nuget.org/api/v2"
3. From PowerShell run: dnvm upgrade

4. Added a Global.json file (I did not already have one). When I added it, it referred to Beta 5 already:

   {
       "projects": [ "Source", "Tests" ],
       "sdk": {
           "version": "1.0.0-beta5-12103"
       }
   }
   

5. Updated all packages in project.json to Beta 5. You can see a full version of my project.lock.json file here.

   {
     "dependencies": {
       "Boilerplate.Web.Mvc6": "1.0.2",
       "Microsoft.AspNet.Diagnostics": "1.0.0-beta5",
       "Microsoft.AspNet.Mvc": "6.0.0-beta5",
       "Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-beta5",
       "Microsoft.AspNet.Mvc.Xml": "6.0.0-beta5",
       "Microsoft.AspNet.Server.IIS": "1.0.0-beta5",
       "Microsoft.AspNet.Server.WebListener": "1.0.0-beta5",
       "Microsoft.AspNet.StaticFiles": "1.0.0-beta5",
       "Microsoft.AspNet.Tooling.Razor": "1.0.0-beta5",
       "Microsoft.Framework.CodeGenerators.Mvc": "1.0.0-beta5",
       "Microsoft.Framework.Configuration.EnvironmentVariables": "1.0.0-beta5",
       "Microsoft.Framework.Configuration.Json": "1.0.0-beta5",
       "Microsoft.Framework.Configuration.UserSecrets": "1.0.0-beta5",
       "Microsoft.Framework.Logging": "1.0.0-beta5",
       "Microsoft.Framework.Logging.Console": "1.0.0-beta5",
       "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-beta5",
       "Newtonsoft.Json": "6.0.6",
       "System.Runtime": "4.0.20-beta-23019"
     }
     "frameworks": {
         "dnx451": {
           "frameworkAssemblies": {
             "System.Net.Http": "4.0.0.0",
             "System.ServiceModel": "4.0.0.0"
           }
         },
         "dnxcore50": {
           "dependencies": {
             "System.Net.Http": "4.0.0-beta-23019"
           }
         }
       }
   }
   

6. The instructions then go on to say you should run the following commands but I believe VS 2015 RC does this for you dnu restore then dnu build.

UPDATE

It seems to be a problem with browser link, commenting the line out allows the site to work. It may be broken? Need to hunt around the aspnet GitHub issues.

Answer 1

In order to help you migrate from beta4 to beta5, these are the following steps it took me, based on the research/findings.

Environment

• PowerShell run: $env:DNX_FEED="https://www.nuget.org/api/v2"
• PowerShell run: dnvm install 1.0.0-beta5
• PowerShell run: dnvm use 1.0.0-beta5 -p (not sure if its needed however i had to)

Project

• Open global.json and update sdk to 1.0.0-beta5 should look like this:

  {
      "projects": [ "src", "test" ],
      "sdk": {
          "version": "1.0.0-beta5"
      }
  }
  

• Open project.json:

  • Updated dependencies versions from beta4 to beta5

  • Change Configuration dependency from:

    "Microsoft.Framework.ConfigurationModel.Json": "1.0.0-beta4"
    

    to

    "Microsoft.Framework.Configuration": "1.0.0-beta5",
    "Microsoft.Framework.Configuration.Json": "1.0.0-beta5"
    

  • Remove Microsoft.VisualStudio.Web.BrowserLink.Loader
  • Rename _GlobalImport.cshtml to _ViewImports.cshtml

Startup.cs changes

• Change Configuration breaking changes

  • Change namespace from using Microsoft.Framework.ConfigurationModel; to using Microsoft.Framework.Configuration;

  • Change Configuration.GetSubKey to Configuration.GetConfigurationSection

  • Change CTOR to:

    public Startup(IHostingEnvironment env, IApplicationEnvironment appEnv)
    {           
        // Setup configuration sources.
        var configBuilder = new ConfigurationBuilder(appEnv.ApplicationBasePath)
        .AddJsonFile("config.json")
        .AddEnvironmentVariables();
    
        Configuration = configBuilder.Build();
    }
    

  • Remove app.UseBrowserLink();

Project DNU CMDs

• Open PowerShell within app root
• Run dnu restore
• Run dnu build
• Closing and reopening VS at this point helps sometimes.

Myself found it quite difficult to upgrade an existing project, couldn't find all steps required all together. Hope it helps!

Answer 2

To complete, if you want to update from beta 4 to beta 6, see the Stephen Lautier's answer and to this after :

To update from beta 5 to beta 6 :

I did :

• Open global.json and update sdk to "1.0.0-beta6" and save this file
• Visual Studio 2015 proposes to download beta6, click on Yes

In project.json :

• change dnx451 (or dnx452) to dnx46 (To use Framework 4.6)
• replace all "-beta5" with "-beta6" in this file
• remove Microsoft.Framework.ConfigurationModel.UserSecrets

In Startup.cs, if you use Session :

• replace app.UseInMemorySession(...) with app.UseSession()

• In ConfigureServices, add this :

   services.AddCaching();
   services.AddSession();
   services.ConfigureSession(o => {    o.IdleTimeout = TimeSpan.FromSeconds(10); });
  

• Right click on your Project > Properties > Debug > Add a new Environment Variable :

Name : DNX_IIS_RUNTIME_FRAMEWORK

Value : dnx46

See that for more information : http://jameschambers.com/2015/07/launching-an-asp-net-5-application-from-visual-studio-2015/

• In Package Manager Console, write this "dnu restore" and this "dnu build"
• Restart Visual Studio

My project work in beta6 after that, maybe there are other things to do.