EntityFramework.Core，Version=7.0.0.0，使用System.Linq.Expressions，Version=4.0.11.0

Question

我有一个包含三个项目的ASP.NET 5.0解决方案

1. MVC项目
2. 数据存取项目
3. 实体叛逃

在尝试将项目从ASP.NET 5和EF 7的beta-8升级到RC1-final之后，我得到了以下错误(在我所看过的任何搜索中都没有得到任何结果)。

*错误:错误CS1705程序集'EntityFramework.Core‘与标识'EntityFramework.Core，Version=7.0.0.0，Culture=neutral，PublicKeyToken=adb9793829ddae60’使用'System.Linq.Expressions，Version=4.0.11.0，Culture=neutral，PublicKeyToken=b03f5f7f11d50a3a‘，后者的版本比带有标识的引用程序集System.Linq.Expressions’System.Linq.Expressions、Version=4.0.0.0、Culture=neutral、PublicKeyToken=b03f5f7f11d50a3a‘ASS.DomainDataModel****的版本要高。

我尝试通过Package控制台加载不同版本的System.Linq，针对所有三个项目，并从所有项目的project.json文件中删除System.Linq，并将其添加回去，在那里也尝试不同的版本。我越想弄清楚这件事，我就会越来越困惑。我想我错过了一些显而易见的东西..。

正如建议的那样，下面是三个project.json文件的内容

MVC项目：

{
  "webroot": "wwwroot",
  "version": "1.0.0-*",

  "dependencies": {
    "Microsoft.AspNet.Diagnostics": "1.0.0-rc1-final",
    "Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final",
    "Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
    "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
    "Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final",
    "Microsoft.Extensions.Logging.Debug": "1.0.0-rc1-final",
    "Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-rc1-final",
    "System.Linq.Parallel": "4.0.1-beta-23516", 
    "ASS.DomainClasses": "1.0.0-*",
    "ASS.DomainDataModel": "1.0.0-*"
  },

  "commands": {
    "web": "Microsoft.AspNet.Server.Kestrel",
    "ef": "EntityFramework.Commands"
  },

  "frameworks": {
    "dnx451": {
      "dependencies": {
        "System.Linq.Expressions": "4.0.11-beta-23516"
      }
    },
    "dnxcore50": {
      "dependencies": {
        "System.Linq.Expressions": "4.0.10"
      }
    }
  },

  "exclude": [
    "wwwroot",
    "node_modules",
    "bower_components"
  ],
  "publishExclude": [
    "node_modules",
    "bower_components",
    "**.xproj",
    "**.user",
    "**.vspscc"
  ]
}

数据存取项目：

{
  "version": "1.0.0-*",
  "description": "ASS.DomainDataModel Class Library",
  "tags": [ "" ],
  "projectUrl": "",
  "licenseUrl": "",

  "frameworks": {
    "dnx451": {
      "dependencies": {
        "System.Linq.Expressions": "4.0.11-beta-23516"
      }
    },
    "dnxcore50": {
      "dependencies": {
      }
    }
  },

  "dependencies": {
    "ASS.DomainClasses": "1.0.0-*",
    "Microsoft.Extensions.PlatformAbstractions": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.Json": "1.0.0-rc1-final",
    "EntityFramework.Core": "7.0.0-rc1-final",
    "EntityFramework.Commands": "7.0.0-rc1-final",
    "EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final",
    "EntityFramework.Relational": "7.0.0-rc1-final"
  },

    "commands": {
    "ef": "EntityFramework.Commands"
  }
}

实体发展基金项目：

{
  "version": "1.0.0-*",
  "description": "ASS.DomainClasses Class Library",
  "tags": [ "" ],
  "projectUrl": "",
  "licenseUrl": "",

  "frameworks": {
    "dnx451": {
      "dependencies": {
        "System.Linq.Expressions": "4.0.11-beta-23516"
      }
    },
    "dnxcore50": {
      "dependencies": {
        "Microsoft.CSharp": "4.0.1-beta-23516",
        "System.Collections": "4.0.11-beta-23516",
        "System.Linq.Expressions": "4.0.10",
        "System.Runtime": "4.0.21-beta-23516",
        "System.Threading": "4.0.11-beta-23516"
      }
    }
  }
}

Answer 1

"dependencies"和"frameworkAssemblies"在project.json中有一个微妙的区别。您的"dnx451"框架正在使用System.Linq.Expressions的打包版本。您更可能需要指定框架程序集。(我不知道你的项目的确切要求。)

请参阅What is the difference between 'dependencies' and 'frameworkAssemblies' in project.json?

此外，这可能是由于ASS.DomainDataModel中的不兼容。