entity-framework - 使用最新的 Entity Framework Core 获取 Newtonsoft.Json 程序集错误

Question

在为 TC 2 安装最新的 visual studio 更新后，我创建了一个新的 Web Api 项目。

向项目添加实体 Microsoft.EntityFrameworkCore": "1.0.0-rc2-final 和 Microsoft.EntityFrameworkCore.Tools: 1.0.0-preview1-final。

打开命令行并输入 dotnet ef。

此时我得到一个错误:

Could not load file or assembly 'Newtonsoft.Json, Version=7.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The system cannot find the file specified. 

我的工具版本有误吗？

我使用的版本是 intellisense 提供的版本。

摘自 project.json:

{
  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.0.0-rc2-3002702",
      "type": "platform"
    },
    "Microsoft.AspNetCore.Mvc": "1.0.0-rc2-final",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0-rc2-final",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0-rc2-final",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0-rc2-final",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0-rc2-final",
    "Microsoft.Extensions.Configuration.Json": "1.0.0-rc2-final",
    "Microsoft.Extensions.Logging": "1.0.0-rc2-final",
    "Microsoft.Extensions.Logging.Console": "1.0.0-rc2-final",
    "Microsoft.Extensions.Logging.Debug": "1.0.0-rc2-final",
    "Microsoft.EntityFrameworkCore": "1.0.0-rc2-final",
    "Microsoft.EntityFrameworkCore.SqlServer": "1.0.0-rc2-final",
    "Microsoft.NETCore.Platforms": "1.0.1-rc2-24027",
    "Microsoft.EntityFrameworkCore.Tools": {
      "version": "1.0.0-preview1-final" ,
      "type": "build"
    }
  },

  "tools": {
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": {
      "version": "1.0.0-preview1-final",
      "imports": "portable-net45+win8+dnxcore50"
    },
    "Microsoft.EntityFrameworkCore.Tools": {
      "imports": [ "portable-net451+win8" ],
      "version": "1.0.0-preview1-final"
    }
  },

  "frameworks": {
    "netcoreapp1.0": {
      "imports": [
        "dotnet5.6",
        "dnxcore50",
        "portable-net45+win8",
        "portable-net451+win8"
      ]
    }
  },

Answer 1

一个解决方法帮我节省了时间。

1. 删除:

   • %USERPROFILE%\.nuget\packages\.tools\Microsoft.EntityFrameworkCore.Tools
   • %USERPROFILE%\.nuget\packages\Microsoft.EntityFrameworkCore.Tools

2. 重新运行 dotnet restore