我使用这个MSDN教程在VS2015中运行昨天成功运行的命令PM> Add-Migration MyFirstMigration -context BloggingContext，但是今天它给出了其他用户这里也指出的以下错误。我甚至从解决方案资源管理器中删除了Migrations文件夹，从SQL Express 2014 on Win 8.1中删除了相应的db，但错误相同。即使我运行Add-Migration MyFirstMigration，也会得到相同的错误：
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 : CommandNotFoundExceptionNote：我正在使用最新版本的ASP.NET Core1.0和VS2015 -更新3,2016年6月27日发布。
更新
当使用命令窗口时，下列命令在windows资源管理器中的项目目录中运行良好：
> dotnet ef migrations add MyFirstMigration --context BloggingContext
> dotnet ef database update --context BloggingContext更新2a
以下是project.json文件：
{
"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%" ]
}
}
回答 24
Stack Overflow用户
发布于 2018-09-28 23:06:35
只需从nuget安装Microsoft.EntityFrameworkCore.Tools包：
安装-软件包Microsoft.EntityFrameworkCore.Tools -Version 6.0.10
您还可以使用此链接安装最新版本：NuGet包链路
.NET CLI命令：
dotnet add package Microsoft.EntityFrameworkCore.Tools如果问题仍然存在，请尝试重新启动Visual。
Stack Overflow用户
发布于 2016-11-21 11:39:48
尝试以下步骤：
1)打开project.json文件，从依赖项和工具部分删除所有Microsoft.EntityFrameworkCore.Tools引用。
2) 关闭包管理器控制台(PMC)和重新启动 Visual
3) 在依赖项下添加：
"Microsoft.EntityFrameworkCore.Tools": {
"version": "1.0.0-preview2-final",
"type": "build"
}4) 在工具部分添加
"Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final"5) 重新启动，Visual 2015
6) 打开 PMC并键入
Add-Migration $Your_First_Migration_Name$这是因为PMC在Visual启动时识别这些工具。
Stack Overflow用户
发布于 2016-07-03 20:16:40
确保在您的Microsoft.EntityFrameworkCore.Tools的dependencies部分引用了project.json。NuGet不会从tools部分加载Package命令。(见NuGet/Home#3023)
{
"dependencies": {
"Microsoft.EntityFrameworkCore.Tools": {
"version": "1.0.0-preview2-final",
"type": "build"
}
}
}https://stackoverflow.com/questions/38173404
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