Microsoft.EntityFrameworkCore.Tools未安装，ASP.net核心

Question

我正在创建一个简单的控制台应用程序（.Net Core）应用程序，其中我定义了一个名为fruit的类和一个名为FruitDbContext的dbcontext。本例中我使用了VS2015和SQL Server。

我希望vs2015能为我创建数据库（代码第一次迁移？）。我已经安装了Package EntityFrameworkCore及其工具，然后使用Add-Migration for vs2015来创建数据库。我的sqlserver是本地安装的，所以没有网络问题。添加迁移遇到一个奇怪的Microsoft.EntityFrameworkCore.Tools安装成功时未安装。

PM> Install-Package Microsoft.EntityFrameworkCore.SqlServer 
Retrieving package 'Microsoft.EntityFrameworkCore.SqlServer 1.1.1' from 'nuget.org'. 
    GET https://www.nuget.org/api/v2/Packages(Id='Microsoft.EntityFrameworkCore.SqlServer',Version='1.1.1') 
    OK https://www.nuget.org/api/v2/Packages(Id='Microsoft.EntityFrameworkCore.SqlServer',Version='1.1.1') 43ms 
    GET https://www.nuget.org/api/v2/package/Microsoft.EntityFrameworkCore.SqlServer/1.1.1 
    OK https://www.nuget.org/api/v2/package/Microsoft.EntityFrameworkCore.SqlServer/1.1.1 103ms 
Installing Microsoft.EntityFrameworkCore.SqlServer 1.1.1. 
Installing NuGet package Microsoft.EntityFrameworkCore.SqlServer.1.1.1. 
Successfully installed 'Microsoft.EntityFrameworkCore.SqlServer 1.1.1' to ConsoleApp1 
Executing nuget actions took 1.01 sec 
Time Elapsed: 00:00:01.3928695 
PM> Install-Package microsoft.EntityFrameworkCore.Tools 
Retrieving package 'Microsoft.EntityFrameworkCore.Tools 1.1.0' from 'nuget.org'. 
    GET https://www.nuget.org/api/v2/Packages(Id='Microsoft.EntityFrameworkCore.Tools',Version='1.1.0') 
    OK https://www.nuget.org/api/v2/Packages(Id='Microsoft.EntityFrameworkCore.Tools',Version='1.1.0') 79ms 
    GET https://www.nuget.org/api/v2/package/Microsoft.EntityFrameworkCore.Tools/1.1.0 
    OK https://www.nuget.org/api/v2/package/Microsoft.EntityFrameworkCore.Tools/1.1.0 105ms 
Installing Microsoft.EntityFrameworkCore.Tools 1.1.0. 
Installing NuGet package Microsoft.EntityFrameworkCore.Tools.1.1.0. 
Successfully installed 'Microsoft.EntityFrameworkCore.Tools 1.1.0' to ConsoleApp1 
Executing nuget actions took 554.65 ms 
Time Elapsed: 00:00:00.8128143 
PM> Add-Migration InitialMigration 
Cannot execute this command because 'Microsoft.EntityFrameworkCore.Tools' is not installed in project 'src\ConsoleApp1'. Add 'Microsoft.EntityFrameworkCore.Tools' to the 'tools' section in project.json. See http://go.microsoft.com/fwlink/?LinkId=798221 for more details. 

我的JSON文件

{ 
    "version": "1.0.0-*", 
    "buildOptions": { 
     "emitEntryPoint": true 
    }, 

    "dependencies": { 
      "Microsoft.EntityFrameworkCore.SqlServer": "1.1.1", 
      "Microsoft.EntityFrameworkCore.Tools": "1.1.0", 
      "Microsoft.NETCore.App": { 
       "type": "platform", 
       "version": "1.0.1" 
      } 
    }, 
    "frameworks": { 
     "netcoreapp1.0": { 
      "imports": "dnxcore50" 
     } 
    } 
} 

我试图恢复包，重建项目，但什么也没有帮助。

这是我的项目的结构表明，我没有做什么花哨

我的类一样简单，因为他们可能是：

Fruit.cs

namespace ConsoleApp1.Entity 
{ 
    public class Fruit 
    { 
     public string ID { get; set; } 
     public string FruitName { get; set; } 
     public string FruitColor { get; set; } 
    } 
} 

FruitDbContext.cs

using Microsoft.EntityFrameworkCore; 

namespace ConsoleApp1.Entity 
{ 
    public class FruitDbContext : DbContext 
    { 
     public DbSet<Fruit> Fruits { get; set; } 
     protected override void OnConfiguring(DbContextOptionsBuilder optionBuilder) 
     { 
      optionBuilder.UseSqlServer(@"Data Source = xxx; Database=Fruitdb; Integrated Security = True; Connect Timeout = 15; Encrypt = False; TrustServerCertificate = True; ApplicationIntent = ReadWrite; MultiSubnetFailover = False"); 
     } 
    } 
} 

我认为这与我的课无关，但无论如何我都列出来了。我试图将这些工具移动到其他文章中建议的json文件中的自己的部分，但我仍然得到相同的错误。

有什么想法？

Answer 1

如果你选择错误，它说的最后一行 - Add 'Microsoft.EntityFrameworkCore.Tools' to the 'tools' section in project.json

在你project.json，您仅添加了依赖。您还需要添加工具部分。请参阅下样品 -

{ 
    "version": "1.0.0-*", 
    "buildOptions": { 
     "emitEntryPoint": true 
    }, 

    "dependencies": { 
      "Microsoft.EntityFrameworkCore.SqlServer": "1.1.1", 
      "Microsoft.EntityFrameworkCore.Tools": "1.1.0", 
      "Microsoft.NETCore.App": { 
       "type": "platform", 
       "version": "1.0.1" 
      } 
    }, 
    "tools": { 
     .... 
     "Microsoft.EntityFrameworkCore.Tools.DotNet": "1.1.0-preview4" << Add respective version here 
     .... 
    }, 
    "frameworks": { 
     "netcoreapp1.0": { 
      "imports": "dnxcore50" 
     } 
    } 
} 

欲了解更多详情，请参阅升级工具包款here