未在Scaffold-DbContext上的項目中安裝“ Microsoft.EntityFrameworkCore.Tools”

Question

我正在關注此處列出的教程：

https://docs.efproject.net/zh_CN/latest/platforms/aspnetcore/existing-db.html

但是，我希望數據庫上下文，實體等不存在於WebApplication項目中，而是希望其駐留在另一個.NET Core類庫中。

通過更新庫project.json文件以包含'netcoreapp1.0'框架，我解決了一些早期兼容性問題。

project.json

之前：

{
    "version": "1.0.0-*",

    "dependencies": {
        "NETStandard.Library": "1.6.0"
    },

    "frameworks": {
        "netstandard1.6": {
            "imports": "dnxcore50"
        }
    }
}

后：

{
  "version": "1.0.0-*",

  "frameworks": {
    "netcoreapp1.0": {
      "imports": [ "portable-net451+win8" ],
      "buildOptions": {
        "emitEntryPoint": true
      },

      "dependencies": {
        "Microsoft.EntityFrameworkCore.SqlServer": "1.0.0",
        "Microsoft.EntityFrameworkCore.SqlServer.Design": "1.0.0",
        "Microsoft.NETCore.App": {
          "type": "platform",
          "version": "1.0.0-*"
        },
        "Microsoft.EntityFrameworkCore": "1.0.0-*",
        "Microsoft.EntityFrameworkCore.Tools": "1.0.0-*"
      },
      "tools": {
        "Microsoft.EntityFrameworkCore.Tools": "1.0.0-*"
      }
    },
    "netstandard1.6": {
      "imports": "dnxcore50",
      "dependencies": {
        "NETStandard.Library": "1.6.0"
      }
    }
  }
}

本教程繼續說，為了對模型進行反向工程，必須在包管理器控制台中運行以下命令：

Scaffold-DbContext "Server=(localdb)\mssqllocaldb;Database=Blogging;Trusted_Connection=True;" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models

我收到以下錯誤消息：

Cannot execute this command because 'Microsoft.EntityFrameworkCore.Tools' is not installed in project 'src\DB'. Add 'Microsoft.EntityFrameworkCore.Tools' to the 'tools' section in project.json. See http://go.microsoft.com/fwlink/?LinkId=798221 for more details.

其中DB是類庫的名稱。

您可以在“工具”部分中清楚地看到Microsoft.EntityFrameworkCore.Tools。 所以我不確定如何進行。

Answer 1

在project.json模式中定義的“框架”部分中沒有工具部分。

這應該正常工作

{
  "version": "1.0.0-*",

  "dependencies": {
    "Microsoft.EntityFrameworkCore.SqlServer": "1.0.0",
    "Microsoft.EntityFrameworkCore.SqlServer.Design": "1.0.0",
    "Microsoft.EntityFrameworkCore": "1.0.0-*",
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-*"
  },
  "tools": {
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-*"
  },

  "frameworks": {
    "netcoreapp1.0": {
      "imports": [ "portable-net451+win8" ],
      "buildOptions": {
        "emitEntryPoint": true
      },
      "dependencies": {
        "Microsoft.NETCore.App": {
          "type": "platform",
          "version": "1.0.0-*"
        }
      }
    },
    "netstandard1.6": {
      "imports": "dnxcore50",
      "dependencies": {
        "NETStandard.Library": "1.6.0"
      }
    }
  }
}