术语“添加-迁移"是指.不被认可 [英] The term "Add-Migration" is not recognized

问题描述

我正在使用 MSDN可以在VS2015中运行的教程昨天成功运行的命令PM> Add-Migration MyFirstMigration -context BloggingContext，但是今天它给出了以下错误，其他用户也指出了以下错误此处.我什至从解决方案资源管理器中删除了Migrations文件夹，并从SQL Express 2014 on Win 8.1中删除了相应的数据库，但存在相同的错误.即使我运行Add-Migration MyFirstMigration，我也会遇到相同的错误:

I'm using this MSDN Tutorial to run in VS2015 the command PM> Add-Migration MyFirstMigration -context BloggingContext that ran yesterday successfully but today it's giving the following error that is also pointed out by other users here. I even deleted the Migrations folder from solution explorer and the corresponding db from SQL Express 2014 on Win 8.1 but same error. Even if I run Add-Migration MyFirstMigration I get same error:

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

注意:我正在使用最新版本的ASP.NET Core 1.0和VS2015-Update 3，该版本于2016年6月27日发布.

Note: I'm using latest version of ASP.NET Core 1.0 and VS2015 - Update 3 released on June 27, 2016.

更新

使用命令窗口时，以下命令在Windows资源管理器中的项目目录中可以正常运行:

The following commands work fine from the project directory in the windows explorer when using command window:

> dotnet ef migrations add MyFirstMigration --context BloggingContext
> dotnet ef database update --context BloggingContext

更新2a

以下是project.json文件:

Following is the project.json file:

{
  "userSecretsId": "aspnet-ASPCore_RTM_CodeFirst_test-bef835d9-9831-41a8-bc3a-cd2f1477a880",

  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.0.0",
      "type": "platform"
    },
    "Microsoft.AspNetCore.Authentication.Cookies": "1.0.0",
    "Microsoft.AspNetCore.Diagnostics": "1.0.0",
    "Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.0.0",
    "Microsoft.AspNetCore.Identity.EntityFrameworkCore": "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.EntityFrameworkCore.SqlServer": "1.0.0",
    "Microsoft.EntityFrameworkCore.SqlServer.Design": {
      "version": "1.0.0",
      "type": "build"
    },
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
    "Microsoft.Extensions.Configuration.Json": "1.0.0",
    "Microsoft.Extensions.Configuration.UserSecrets": "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.VisualStudio.Web.BrowserLink.Loader": "14.0.0",
    "Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    },
    "Microsoft.VisualStudio.Web.CodeGenerators.Mvc": {
      "version": "1.0.0-preview2-final",
      "type": "build"
    }
  },

  "tools": {
    "BundlerMinifier.Core": "2.0.238",
    "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final",
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final",
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final",
    "Microsoft.Extensions.SecretManager.Tools": "1.0.0-preview2-final",
    "Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
      "version": "1.0.0-preview2-final",
      "imports": [
        "portable-net45+win8"
      ]
    }
  },

  "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%" ]
  }
}

推荐答案

它是如此简单.

只需从nuget安装Microsoft.EntityFrameworkCore.Tools软件包:

Just install Microsoft.EntityFrameworkCore.Tools package from nuget:

安装软件包Microsoft.EntityFrameworkCore.Tools-版本3.1.5

Install-Package Microsoft.EntityFrameworkCore.Tools -Version 3.1.5

您还可以使用此链接来安装最新版本: Nuget软件包链接

You can also use this link to install the latest version: Nuget package link

这篇关于术语“添加-迁移"是指.不被认可的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！