asp.net mvc 5 数据库迁移中的 CommandNotFoundException答案

【问题标题】：CommandNotFoundException in asp.net mvc 5 database migrationasp.net mvc 5 数据库迁移中的 CommandNotFoundException
【发布时间】：2017-12-15 09:11:52
【问题描述】：

我尝试运行这个命令：

Enable-Migrations -ContextType ApplicationDbContext

得到这个异常：

Enable-Migrations : The term 'Enable-Migrations' 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
+ Enable-Migrations -ContextType ApplicationDbContext
+ ~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Enable-Migrations:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

我正在使用 vs 2015 社区版。重新启动并以管理员身份运行无法解决问题。如果我尝试运行此命令来重新安装实体框架：

Install-Package EntityFramework -IncludePrerelease

也得到这个异常：

Install-Package : An error occurred while retrieving package metadata for 'Newtonsoft.Json.10.0.3' from source 'C:\Path\packages'.
At line:1 char:1
+ Install-Package EntityFramework -IncludePrerelease
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

请给我任何解决方案。

【问题讨论】：

标签： asp.net asp.net-mvc entity-framework ef-code-first entity-framework-migrations

【解决方案1】：

区分大小写

enable-migrations -contexttypename DBCONTEXT

您还可以从

中查看可用选项

get-help EntityFramework

【讨论】：

它没有解决问题。同样的错误显示@Rahul