启用 - 迁移：“启用 - 迁移”一词不会被识别为cmdlet

Question

我正在尝试在我的某个解决方案上安装EntityFramefork，但Package Manager Console无法识别Enable-Migrations。

PM> Enable-Migrations
Enable-Migrations : The term 'Enable-Migrations' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a pa
th was included, verify that the path is correct and try again.
At line:1 char:1
+ Enable-Migrations
+ ~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Enable-Migrations:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

project.json
{
  "version": "1.0.0-*",
  "compilationOptions": {
    "emitEntryPoint": true
  },

  "dependencies": {
    "EntityFramework": "6.1.3",
    "Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final",
    "Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
    "Microsoft.AspNet.Mvc.WebApiCompatShim": "6.0.0-rc1-final",
    "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
    "Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.FileProviderExtensions": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.Json": "1.0.0-rc1-final",
    "Microsoft.Extensions.Logging": "1.0.0-rc1-final",
    "Microsoft.Extensions.Logging.Console": "1.0.0-rc1-final",
    "Microsoft.Extensions.Logging.Debug": "1.0.0-rc1-final",
    "Newtonsoft.Json": "10.0.2"
  },

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

  "frameworks": {
    "dnx451": {
      "dependencies": {
        "Application": "1.0.0-*",
        "Microsoft.AspNet.WebApi.Client": "5.2.3",
        "Models": "1.0.0-*",
        "Newtonsoft.JsonResult": "1.0.5778.10762"
      }
    }
  },

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

我从不同的线程中执行了这些步骤，但没有成功： 1.使用-IncludePrerelease重新安装EF 2.使用管理员权限重新启动VS

Package Manager Console Enable-Migrations CommandNotFoundException only in a specific VS project

Answer 1

EF Core不再具有Enable-Migrations命令。默认情况下启用迁移。使用Add-Migration添加新迁移。

有关包管理器命令的文档是here