c# - 为什么 Visual Studio 2013 中没有安装实体框架包？

Question

我安装了Visual Studio 2013，但是无论我做什么，我都无法安装实体框架包

The source at nuget.org [https://www.nuget.org/api/v2/] is unreachable. Falling back to NuGet Local Cache at C:\Users\mohammad\AppData\Local\NuGet\Cache
Install-Package : Unable to find package 'EntityFramework'.
At line:1 char:1
+ Install-Package EntityFramework
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], InvalidOperationException
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand
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