Problem with compiling ASP.NET 5 project beta 6 with dnx451 section Error: Predefined type 'System.Object' is not defined or imported

[radenkozec]

When I want to compile my project I am getting over 2000 errors like this:
Predefined type 'System.Object' is not defined or imported
If I remove dnx451 section from my project.json config all issues are resolved.
My project.json:

 "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.Abstractions": "1.0.0-beta6",
    "Microsoft.Framework.Configuration.Json": "1.0.0-beta6",
    "Microsoft.Framework.Configuration.UserSecrets": "1.0.0-beta6",
    "Microsoft.Framework.Logging": "1.0.0-beta6",
    "Microsoft.Framework.Logging.Console": "1.0.0-beta6",
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-beta6",
    "Project1.Data": "1.0.0-*",
    "Project1.Model": "1.0.0-*",
    "Mandrill.Client": "1.0.0-*"
  },

  "commands": {
    "web": "Microsoft.AspNet.Hosting --config hosting.ini",
    "ef": "EntityFramework.Commands"
  },

  "frameworks": {
    "dnx451":{},
    "dnxcore50": {
      "dependencies": {
        "System.IO.FileSystem.Primitives": "4.0.0-beta-23109",
        "System.IO.FileSystem": "4.0.0-beta-23109"
      }

    }
  },

[davidfowl]

I'm guessing the problems have to do with your project references. What are in those projects?

[radenkozec]

My ASP.NET 5 project is referencing 3 smaller .NET Core class library projects:
"Project1.Data": "1.0.0-",
"Project1.Model": "1.0.0-",
"Mandrill.Client": "1.0.0-*"

Project1.Data which needs to be referenced also from .NET Framework Project so it has dotnet section:

"dependencies": {
    "Project1.Model": "1.0.0-*",
     "Microsoft.Framework.Configuration.Abstractions": "1.0.0-beta6",
    "Microsoft.Framework.Configuration.Json": "1.0.0-beta6",
    "Newtonsoft.Json": "7.0.1-beta3",
    "System.Net.Http": "4.0.0-beta-23109",
    "System.Data.SqlClient": "4.0.0-beta-23109",
    "System.Data.Common": "4.0.0-beta-23109"
  },

  "frameworks": {
    "dotnet": { },

    "dnxcore50": {
      "dependencies": {
        "System.Collections": "4.0.10-beta-23109",
        "System.Runtime": "4.0.20-beta-23109",
        "System.Runtime.Extensions": "4.0.10-beta-23109"
      }
    }
  }

Project1.Model

 "dependencies": {
    "System.Linq": "4.0.0-beta-23109",
    "System.Threading": "4.0.10-beta-23109",
    "Microsoft.CSharp": "4.0.0-beta-23109"
  },

  "frameworks": {
    "dotnet": { },
    "dnx451": { },
    "dnxcore50": {
      "dependencies": {
        "System.Collections": "4.0.10-beta-23109",
        "System.Runtime": "4.0.20-beta-23109",
        "System.Runtime.Extensions":"4.0.10-beta-23109"
      }
    }
  }

And Mandrill.Client which also need to be used from .NET Framework project

"dependencies": {
    "Newtonsoft.Json": "7.0.1-beta3",
    "System.Net.Http": "4.0.0-beta-23109",
    "System.Linq": "4.0.0-beta-23109",
    "System.Threading": "4.0.10-beta-23109",
    "Microsoft.CSharp": "4.0.0-beta-23109"
  },

  "frameworks": {
    "dotnet": { },
    "dnx451": {

    },
    "dnxcore50": {
      "dependencies": {
        "System.Collections": "4.0.10-beta-23109"
      }
    }
  }

[davidfowl]

Project1.Data which needs to be referenced also from .NET Framework Project so it has dotnet section:

Avoid using the System.* packages in places where dnx451 exist and instead should prefer frameworkAssemblies. Use them in dotnet and in dnxcore50 but not in dnx4x targets. You should also introduce dnx45x targets if you don't have them in your class lib (Project1.Data as an example).

[radenkozec]

I had dnx45x targets in Project1.Data but removed them because compilation errors received above.
So you are saying for Project1.Data I should:

1. Add dnx451 section
2. Inside that section add frameworkAssemblies
3. Leave everything else as it is.

Can you please give me the example how to refactor only Project1.Data project.json?

[davidfowl]

"dependencies": {
    "Project1.Model": "1.0.0-*",
    "Microsoft.Framework.Configuration.Abstractions": "1.0.0-beta6",
    "Microsoft.Framework.Configuration.Json": "1.0.0-beta6",
    "Newtonsoft.Json": "7.0.1-beta3"
  },

  "frameworks": {
    "dnx451": {
        "frameworkAssemblies": {
          "System.Net.Http": "",
          "System.Runtime": ""
        }
    },
    "dotnet": {
      "dependencies": {
        "System.Collections": "4.0.10-beta-23109",
        "System.Runtime": "4.0.20-beta-23109",
        "System.Runtime.Extensions": "4.0.10-beta-23109",
        "System.Net.Http": "4.0.0-beta-23109",
        "System.Data.SqlClient": "4.0.0-beta-23109",
        "System.Data.Common": "4.0.0-beta-23109"
      }
    }
  }

[radenkozec]

I will try this and post update later. I don't understand why I don't need dnxcore50 section? Does this mean that my project will not support .NET Core?

[radenkozec]

@davidfowl

Managed to make it work.
My ASP.NET 5 project project.json now looks like this:

 "frameworks": {
    "dnx451": {
      "frameworkAssemblies": {
        "System.Runtime": ""
      }
    },
    "dnxcore50": {
      "dependencies": {
        "System.IO.FileSystem.Primitives": "4.0.0-beta-23109",
        "System.IO.FileSystem": "4.0.0-beta-23109"
      }
    }

And in Project1.Data used your project.json just added "System.Data": "" in dnx451 section.
Thank you very much.
But I still do not understand how can I have project without dnxcore50 section in Project1.Data?
Does it mean that my project will not support .NET Core?

[davidfowl]

Read this http://blogs.msdn.com/b/mvpawardprogram/archive/2015/06/18/demystifying-pcls-net-core-dnx-and-uwp-redux.aspx