dotnet：未处理的异常：System.MissingMethodException：在程序集'Microsoft.EntityFrameworkCore.Design中找不到入口点

Question

尝试在程序包管理器控制台中执行dotnet ef migrations add "initial"时出现此错误

这是输出错误

我尝试使用此post解决问题，但这不起作用

这是我的project.json文件

{
  "userSecretsId": "Jobs",
  "dependencies": {
    "AutoMapper.Data": "1.0.0-beta1",
    "FastJobsProject.BLL": "1.0.0-*",
    "FastJobsProject.Entity": "1.0.0-*",
    "FluentValidation": "6.2.1-beta1",
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",
    "Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.0.0",
    "Microsoft.AspNetCore.Mvc": "1.0.0",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0",
    "Microsoft.EntityFrameworkCore": "1.1.1",
    "Microsoft.EntityFrameworkCore.Design": "1.1.1",
    "Microsoft.EntityFrameworkCore.SqlServer": "1.1.1",
    "Microsoft.EntityFrameworkCore.SqlServer.Design": "1.1.1",
    "Microsoft.EntityFrameworkCore.Tools": {
      "version": "1.1.0"
    },
    "Microsoft.Extensions.Configuration": "1.0.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.Extensions.Configuration.UserSecrets": "1.0.0",
    "Microsoft.Extensions.FileProviders.Physical": "1.0.0",
    "Microsoft.NETCore.App": {
      "version": "1.0.0",
      "type": "platform"
    },
    "Newtonsoft.Json": "9.0.1"
  },
  "tools": {
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": {
      "version": "1.0.0-preview2-final",
      "imports": "portable-net45+win8+dnxcore50"
    },
    "Microsoft.EntityFrameworkCore.Tools": {
      "imports": [
        "portable-net45+win8+dnxcore50",
        "portable-net45+win8"
      ],
      "version": "1.0.0-preview2-final"
    } 
  },
  "frameworks": {
    "netcoreapp1.0": {
      "imports": [
        "dotnet5.6",
        "dnxcore50",
        "portable-net45+win8"
      ]
    }
  },
  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },
  "runtimeOptions": {
    "gcConcurrent": true,
    "gcServer": true
  },
  "publishOptions": {
    "include": [
      "wwwroot",
      "web.config"
    ]
  },
  "scripts": {
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }
}

任何人都可以向我解释上述错误的含义及解决方法。

由于

Answer 1

在搜索解决方案并在我的案例中尝试它们之后，我得出结论，依赖版本之间的不兼容性是问题。

这是我的新project.json，它正常工作：

{
  "userSecretsId": "Jobs",

  "dependencies": {
    "AutoMapper.Data": "1.0.0-beta1",
    "FastJobsProject.BLL": "1.0.0-*",
    "FastJobsProject.DAL": "1.0.0-*",
    "FastJobsProject.Entity": "1.0.0-*",
    "FluentValidation": "6.2.1-beta1",
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",
    "Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.0.0",
    "Microsoft.AspNetCore.Mvc": "1.0.0",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0",
    "Microsoft.EntityFrameworkCore": "1.1.1",
    "Microsoft.EntityFrameworkCore.SqlServer": "1.1.1",
    "Microsoft.EntityFrameworkCore.Tools": {
      "type": "build",
      "version": "1.1.0-preview4-final"
    },
    "Microsoft.Extensions.Configuration": "1.0.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.Extensions.Configuration.UserSecrets": "1.0.0",
    "Microsoft.Extensions.FileProviders.Physical": "1.0.0",
    "Microsoft.NETCore.App": {
      "version": "1.0.0",
      "type": "platform"
    },
    "Newtonsoft.Json": "9.0.1"
  },

  "tools": {
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": {
      "version": "1.0.0-preview2-final",
      "imports": "portable-net45+win8+dnxcore50"
    },
     "Microsoft.EntityFrameworkCore.Tools.DotNet": "1.1.0-preview4"
  },

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

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

  "runtimeOptions": {
    "gcServer": true,
    "gcConcurrent": true
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "web.config"
    ]
  },

  "scripts": {
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }
}

我希望如果有人遇到同样的问题会有所帮助。