c# - Newtonsoft.JSON v9.01 + FileNotFoundException (.NET Core Class library)

Question

(VS2015 Update 3 + Patch)

I have a plain .NET console application (.NET 4.6) and reference a .NET core class library that targets NetStandard v1.3. The class library has a reference to Newtonsoft.JSON.

{
  "version": "1.0.0-*",

  "dependencies": {
    "NETStandard.Library": "1.6.0",
    "Newtonsoft.Json": "9.0.1"
  },
  "buildOptions": { "platform": "anycpu" },

  "frameworks": {
    "netstandard1.3": {
      "imports": "dnxcore50"
    }
  }
}

The referenced NewtonSoft.JSON package is deployed here:

C:UsersUserAccount.nugetpackagesNewtonsoft.Json9.0.1

The Exception:

An unhandled exception of type 'System.IO.FileNotFoundException' occurred in DotNetConsoleApplication.exe

Additional information: Could not load file or assembly 'Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The system cannot find the file specified.

I guess the .net core lib would reference the dll from the netstandard1.0 folder.

Answer 1

Creation of NuGet package is a solution but not the easiest one.

Microsoft finally admitted this is a problem and will fix it, expectantly, in NuGet version 4.0.1, the first update to NuGet 4 after VS 2017 ships.

The cleanest workaround now is to add <RestoreProjectStyle>PackageReference</RestoreProjectStyle> to a legacy project. However according to Rob Relyea MS will ignore this property after RTM so another workaround is <PackageReference Update="PlaceholderToConvinceThisProjectToGetTransitivePackageReferenceFromProjectReferences"/>.