如何在 Visual Studio 2015 中使用“添加遷移”命令

Question

我正在使用 Visual Studio 2015 進行 Udemy 課程（與課程相同）

在某些時候，我必須使用Add-Migration命令，但不知何故我做不到。

這是我得到的錯誤：

我搜索了類似的問題，說我必須安裝Microsoft.EntityFrameworkCore.Tools ，但是當我嘗試安裝支持Add-Migration命令的版本時，我收到此錯誤：

'Microsoft.EntityFrameworkCore.Tools 2.1.0' package 需要 NuGet 客戶端版本 '3.6.0' 或更高版本，但當前 Z20055252BAD325BE70C3519DCEE.6.71' 版本是 '3.6.0' 或更高版本要升級 NuGet，請將 go 升級到http://docs.Z0558440846982BFE7FF23Borg/consume/installing79FF23Borg/consume/3。

這是我的project.json文件：

{
  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.0.0",
      "type": "platform"
    },
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",
    "Microsoft.AspNetCore.Mvc": "1.0.0",
    "Microsoft.AspNetCore.Razor.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0",
    "Microsoft.AspNetCore.StaticFiles": "1.0.0",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.Extensions.Logging": "1.0.0",
    "Microsoft.Extensions.Logging.Console": "1.0.0",
    "Microsoft.Extensions.Logging.Debug": "1.0.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0",
    "Microsoft.EntityFrameworkCore": "1.0.0",
    "Microsoft.EntityFrameworkCore.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0",
    "Microsoft.EntityFrameworkCore.SqlServer": "1.0.0",
    "Microsoft.AspNetCore.Identity": "1.0.0",
    "Microsoft.AspNetCore.Authentication.Cookies": "1.0.0",
    "Microsoft.AspNetCore.Identity.EntityFrameworkCore": "1.0.0"
  },
  "tools": {
    "BundlerMinifier.Core": "2.0.238",
    "Microsoft.EntityFrameworkCore.Tools": {
      "version": "1.0.0-preview2-final",
      "imports": [
        "dotnet5.6",
        "portable-net45+win8"
      ]
    },
    "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final"
  },
  "frameworks": {
    "netcoreapp1.0": {
      "imports": [
        "dotnet5.6",
        "portable-net45+win8"
      ]
    }
  },
  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },
  "runtimeOptions": {
    "configProperties": {
      "System.GC.Server": true
    }
  },
  "publishOptions": {
    "include": [
      "wwwroot",
      "Views",
      "Areas/**/Views",
      "appsettings.json",
      "web.config"
    ]
  },
  "scripts": {
    "prepublish": [ "bower install", "dotnet bundle" ],
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }
}

我是否必須直接在我的project.json文件上更改Microsoft.EntityFrameworkCore.Tools版本？

Answer 1

您必須更新 NuGet 的安裝，因為 3.6.0 已經過時了。