Serializable attribute exists in both System.Runtime.Serialization.Formatters and nunit.framework

[SerhiiS-in6k]

Hi I have issue with Serializable attribute

The type 'SerializableAttribute' exists in both 'System.Runtime.Serialization.Formatters, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'nunit.framework, Version=3.4.1.0.

How can I specify the package to use? My project.json :

{
  "version": "1.0.0-*",
  "testRunner": "nunit",
  "buildOptions": {
    "debugType": "portable",
    "allowUnsafe": true,
    "define": [ "WIN64" ]
  },
  "frameworks": {
    "netcoreapp1.0": {
      "buildOptions": {
        "compile": {
          "exclude": [ "Tests/**/*.cs", "Examples/**/**/AssemblyInfo.cs" ]
        },
        "define": [ "NETSTANDARD1_6" ]
      },
      "dependencies": {
        "NETStandard.Library": "1.6.0",
        "System.Runtime": "4.1.0",
        "System.Runtime.Serialization.Formatters": "4.0.0-rc3-24212-01",
        "System.Dynamic.Runtime": "4.0.11",
        "System.Threading.ThreadPool": "4.0.10",
        "System.Reflection.TypeExtensions": "4.1.0",
        "System.Diagnostics.StackTrace": "4.0.1",
        "System.Diagnostics.Process": "4.1.0",
        "System.Threading.Thread": "4.0.0",
        "dotnet-test-nunit": "3.4.0-beta-1",
        "NUnit": "3.4.1"
      },
      "imports": "dnxcore50"
    },
    "net451": {
      "dependencies": {
        "NUnit": "3.4.1",
        "dotnet-test-nunit": "3.4.0-alpha-2"
      },
      "buildOptions": {
        "compile": {
          "exclude": [ "Tests/**/*.cs", "Tests/service-bus-tests-net4/Properties/AssemblyInfo.cs", "Examples/service-example-csharp-dispatcher/Properties/AssemblyInfo.cs", "Examples/service-example-csharp/Properties/AssemblyInfo.cs" ]
        }
      }
    }
  },
  "runtimes": {
    "ubuntu.14.04-x64": {},
    "win10-x64": {},
    "win7-x64": {}
  }
}

[svick]

The same question on dotnet/core: dotnet/core#248.

[shmao]

@SerhiiS-in6k Thanks for opening the issue. Was the error you got a compile time error or a runtime error? I found that NUnit declares an internal type named SerializableAttribute I wondered how that type was conflicting with the one in CoreCLR. Would you mind sharing a simple repro app with us? Thanks.

[svick]

@shmao It was changed to internal fairly recently (nunit/nunit#1683). The latest released version of NUnit, 3.4.1, which is used in the project.json above, still has it as public.

[shmao]

Thanks for the pointer, @svick . That fix in NUnit should resolve the issue with NUnit's next release. For 3.4.1, however, I don't see any workaround to reference both packages and use the attribute type.

[shmao]

Closing the issue as NUnit has fixed the issue.