尝试在 VS 2012 中创建 MVC 控制器时出错

Question

当我右键单击一个文件夹并单击“添加控制器”时，我收到此错误：

Object reference not set to an instance of an object

当我打开项目时，这个错误也开始出现在包管理器控制台中。

New-Object : Could not load file or assembly 'System.Management.Automation, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
At C:\Users\b\Desktop\Git\EyeglassShop\packages\MvcScaffolding.1.0.9\tools\registerWithMvcTooling.ps1:163 char:27
+     $newProvider = New-Object <<<<  $powerShellScaffolderProviderType($mvcScaffoldingProvider)
    + CategoryInfo          : NotSpecified: (:) [New-Object], FileNotFoundException
    + FullyQualifiedErrorId : System.IO.FileNotFoundException,Microsoft.PowerShell.Commands.NewObjectCommand

这是一个完全相同的问题。

Cannot add a MVC controller VS2012 gives "object reference not set to an instance of an object"

解决方案是安装 PowerShell 3，但是当我运行安装程序时出现另一个错误：

The update is not applicable to your computer.

另外值得一提的是，这个错误只发生在特定项目中，如果我创建一个新的 MVC 项目，它就可以正常工作。

如果我可以避免将所有内容都转移到一个新项目中，那我就不会太棒了。有什么建议吗？

更新

尝试从包管理器控制台安装 MvcScaffolding 时出现错误

PM> install-package MvcScaffolding
Attempting to resolve dependency 'T4Scaffolding'.
Attempting to resolve dependency 'T4Scaffolding.Core'.
Attempting to resolve dependency 'EntityFramework'.
Successfully installed 'T4Scaffolding.Core 1.0.0'.
Successfully installed 'T4Scaffolding 1.0.8'.
Successfully installed 'MvcScaffolding 1.0.9'.
New-Object : Could not load file or assembly 'System.Management.Automation, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
At C:\Users\b\Desktop\EyeglassShop\EyeglassShop\packages\MvcScaffolding.1.0.9\tools\registerWithMvcTooling.ps1:163 char:27
+     $newProvider = New-Object <<<<  $powerShellScaffolderProviderType($mvcScaffoldingProvider)
    + CategoryInfo          : NotSpecified: (:) [New-Object], FileNotFoundException
    + FullyQualifiedErrorId : System.IO.FileNotFoundException,Microsoft.PowerShell.Commands.NewObjectCommand

Successfully added 'T4Scaffolding.Core 1.0.0' to EyeglassShop.
Successfully added 'T4Scaffolding 1.0.8' to EyeglassShop.
Successfully added 'MvcScaffolding 1.0.9' to EyeglassShop.

Answer 1

我需要安装 SP 1 才能安装 Powershell .. 虽然我有它：p