错误类型或命名空间名称'Networking‘在UWP目标中的命名空间'Windows’中不存在，如何在多目标项目中修复project.json

{
  "dependencies": {
    "Microsoft.NETCore.UniversalWindowsPlatform": "6.2.9",
    "Windows.Networking": "10.0.18362.0"
  },
  "frameworks": {
    "netcoreapp3.1": {
      "dependencies": {
        "Microsoft.NETCore.UniversalWindowsPlatform": {
          "target": "Package",
          "version": "6.2.9"
        },
        "Windows.Networking": {
          "target": "Package",
          "version": "10.0.18362.0"
        }
      }
    }
  }
}