ASP.NET 5 (vNext) web project: library conflict upgrading from beta4 to beta6

I upgraded DNVM with dnvm upgrade -Unstable. Running dnvm list shows this to be active: 1.0.0-beta6-12120.

I created a new project using the ASP.NET 5 Preview Template for Web Site and verified that it would build.

I changed the project.json to reference beta6:

"dependencies": {
  "EntityFramework.SqlServer": "7.0.0-beta6",
  "EntityFramework.Commands": "7.0.0-beta6",
  "Microsoft.AspNet.Mvc": "6.0.0-beta6",
  "Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-beta6",
  "Microsoft.AspNet.Authentication.Cookies": "1.0.0-beta6",
  "Microsoft.AspNet.Authentication.Facebook": "1.0.0-beta6",
  "Microsoft.AspNet.Authentication.Google": "1.0.0-beta6",
  "Microsoft.AspNet.Authentication.MicrosoftAccount": "1.0.0-beta6",
  "Microsoft.AspNet.Authentication.Twitter": "1.0.0-beta6",
  "Microsoft.AspNet.Diagnostics": "1.0.0-beta6",
  "Microsoft.AspNet.Diagnostics.Entity": "7.0.0-beta6",
  "Microsoft.AspNet.Identity.EntityFramework": "3.0.0-beta6",
  "Microsoft.AspNet.Server.IIS": "1.0.0-beta6",
  "Microsoft.AspNet.Server.WebListener": "1.0.0-beta6",
  "Microsoft.AspNet.StaticFiles": "1.0.0-beta6",
  "Microsoft.AspNet.Tooling.Razor": "1.0.0-beta6",
  "Microsoft.Framework.Configuration.Json": "1.0.0-beta6",
  "Microsoft.Framework.Configuration.UserSecrets": "1.0.0-beta6",
  "Microsoft.Framework.CodeGenerators.Mvc": "1.0.0-beta6",
  "Microsoft.Framework.Logging": "1.0.0-beta6",
  "Microsoft.Framework.Logging.Console": "1.0.0-beta6"
}

But the build fails with runtime library conflicts:


1>MSBUILD : DNX 4.5.1 error CS0433: The type 'AssemblyFileVersionAttribute' exists in both 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' and 'System.Runtime, Version=4.0.20.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
1>MSBUILD : DNX 4.5.1 error CS0433: The type 'AssemblyVersionAttribute' exists in both 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' and 'System.Runtime, Version=4.0.20.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
1>MSBUILD : DNX 4.5.1 error CS0433: The type 'AssemblyInformationalVersionAttribute' exists in both 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' and 'System.Runtime, Version=4.0.20.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
1>MSBUILD : DNX 4.5.1 error CS0518: Predefined type 'System.String' is not defined or imported
1>MSBUILD : DNX 4.5.1 error CS0518: Predefined type 'System.String' is not defined or imported
1>MSBUILD : DNX 4.5.1 error CS0518: Predefined type 'System.String' is not defined or imported
1>MSBUILD : DNX 4.5.1 error CS0518: Predefined type 'System.Void' is not defined or imported
1>MSBUILD : DNX 4.5.1 error CS0518: Predefined type 'System.Void' is not defined or imported
1>MSBUILD : DNX 4.5.1 error CS0518: Predefined type 'System.Boolean' is not defined or imported


How can this be resolved?

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

beta6-*

In your project.json file(s), try using beta6-* instead of just beta6. That means it will reference the most recent build of it.

~.dnxruntimes

Check what runtime directories are in C:UsersMyUser.dnxruntimes. Mine include the following:

dnx-clr-win-x86.1.0.0-beta6          <-- I made this one via a rename.
dnx-clr-win-x86.1.0.0-beta6-12085
dnx-clr-win-x86.1.0.0-beta6-12120

In my global.json file, which is in the same directory as the *.sln, I make sure to reference one of the runtimes like this:

{
    "projects": [ "src", "test" ],
    "sdk": {
        "version": "1.0.0-beta6-12120"
    }
}

Method 2

If building from the command line:

From the command line do a dnu restore. This will force an update of dependency resolution. Pretty much anytime you change the runtime either upgrading to a new one or switching the active runtime I would do a restore.

If building from visual studio:

Visual studio uses the sdk property to determine which runtime to use when building and restoring. This can be different than the runtime set active by dnvm. Setting the active runtime in dnvm does not change the runtime used by the IDE. Setting the target in VS does not change the active runtime on the command line.

To change the runtime used by Visual Studio either:

Set the minimum dnx version for the entire solution.

Edit the global.json (solution level file) manually. Set or change the value for “sdk” to the desired version of the runtime. This sets the defaults for all projects and it can be overridden at the project level below.

OR

Set the desired runtime for the project

Right click on a project > Properties > Application

Check Use specific DNX version.
Set to desired version, platform, and architecture

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0