问题描述
嗨
当我在Manager Console中编写启用迁移时，请帮助我
please help me
（在VS 2015 .net4.6 EF6中） .2）发生此错误。
when I write Enable-Migration in Manager Console (in VS 2015 .net4.6 EF6.2) this Error has happened.
为什么？
无法找到类型[NuGet.VisualStudio.IVsPackageInstallerServices]。
在D：\Programming\AspMVC \files_and_codes \Files and Codes \Projects\q\EF_CodeFirst \packages \ EntityFramework.6.1.3 \ tools \ EntityFramework.psm1：1004
char：60
+ ... entModel.GetService（[NuGet.VisualStudio.IVsPackageInstallerServices]）
+                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  + CategoryInfo         ：InvalidOperation：（NuGet.VisualStu ... stallerServices：TypeName）[]，RuntimeException
  + FullyQualifiedErrorId：TypeNotFound
您无法在空值表达式上调用方法。
在D：\Programming\AspMVC \\ \\ files_and_codes \Files and Codes \Projects\q\EF_CodeFirst\packages\ EntityFramework.6.1.3\tools\EntityFramework.psm1：1006
char：5
+   $ vsPackage = $ packageInstallerServices.GetInstalledPackages（）| ？ ... ...
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~
  + CategoryInfo         ：InvalidOperation :( :) []，RuntimeException
  + FullyQualifiedErrorId：InvokeMethodOnNull
Join-Path：无法将参数绑定到参数'Path'，因为它为null。
在D：\ Programming\AspMVC\files_and_codes \Files and Codes\Projects\q\EF_CodeFirst\packages\ EntityFramework.6.1.3\tools\ EntityFramework.psm1：713
char：28
+   $ toolsPath = Join-Path $ installPath工具
+                           ~~~~~~~~~~~~
  + CategoryInfo         ：InvalidData :( :) [Join-Path]，ParameterBindingValidationException
  + FullyQualifiedErrorId：ParameterArgumentValidationErrorNullNotAllowed，Microsoft.PowerShell.Commands.JoinPathCommand
Join-Path：无法将参数绑定到参数'Path'，因为它为null。
在D：\Programming\AspMVC \ files_and_codes \Files and Codes \Projects\q\EF_CodeFirst\packages\ EntityFramework.6.1.3\tools\ EntityFramework.psm1：780
char：74
+ ... [System.Reflection.Assembly] :: LoadFrom（（Join-Path $ ToolsPath EntityF ...
$
+ ~~~~~~~~~~
+ CategoryInfo ：InvalidData：（:) [Join-Path]，ParameterBindingValidationException
+ FullyQualifiedErrorId：ParameterArgumentValidationErrorNullNotAllowed，Microsoft .PowerShell.Commands.JoinPathCommand
你不能在空值表达式上调用方法。
在D：\Programming \ AspMVC \files_and_codes \Files and Codes \Projects\q\EF_CodeFirst\packages\ EntityFramework.6.1.3\tools\ EntityFramework.psm1：781
char：5
+ $ dispatcher = $ utilityAssembly.CreateInstance（
+ ~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  + CategoryInfo         ：InvalidOperation :( :) []，RuntimeException
  + FullyQualifiedErrorId：InvokeMethodOnNull
Join-Path：无法将参数绑定到参数'Path'，因为它为null。
在D：\ Programming\AspMVC\files_and_codes\Files and Codes\Projects\q\EF_CodeFirst\packages\ EntityFramework.6.1.3\tools\EntityFramework.psm1：810
char：20
+       （Join-Path $ runner.ToolsPath EntityFramework.PowerShell.dll），
+                   ~~~~~~~~~~~~~~~~~~
  + CategoryInfo         ：InvalidData :( :) [Join-Path]，ParameterBindingValidationException
  + FullyQualifiedErrorId：ParameterArgumentValidationErrorNullNotAllowed，Microsoft.PowerShell.Commands.JoinPathCommand
Unable to find type [NuGet.VisualStudio.IVsPackageInstallerServices].
At D:\Programming\AspMVC\files_and_codes\Files and Codes\Projects\q\EF_CodeFirst\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:1004
char:60
+ ... entModel.GetService([NuGet.VisualStudio.IVsPackageInstallerServices])
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (NuGet.VisualStu...stallerServices:TypeName) [], RuntimeException
+ FullyQualifiedErrorId : TypeNotFound
You cannot call a method on a null-valued expression.
At D:\Programming\AspMVC\files_and_codes\Files and Codes\Projects\q\EF_CodeFirst\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:1006
char:5
+ $vsPackage = $packageInstallerServices.GetInstalledPackages() | ? ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : InvokeMethodOnNull
Join-Path : Cannot bind argument to parameter 'Path' because it is null.
At D:\Programming\AspMVC\files_and_codes\Files and Codes\Projects\q\EF_CodeFirst\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:713
char:28
+ $toolsPath = Join-Path $installPath tools
+ ~~~~~~~~~~~~
+ CategoryInfo : InvalidData: (:) [Join-Path], ParameterBindingValidationException
+ FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.JoinPathCommand
Join-Path : Cannot bind argument to parameter 'Path' because it is null.
At D:\Programming\AspMVC\files_and_codes\Files and Codes\Projects\q\EF_CodeFirst\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:780
char:74
+ ... [System.Reflection.Assembly]::LoadFrom((Join-Path $ToolsPath EntityF ...
+ ~~~~~~~~~~
+ CategoryInfo : InvalidData: (:) [Join-Path], ParameterBindingValidationException
+ FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.JoinPathCommand
You cannot call a method on a null-valued expression.
At D:\Programming\AspMVC\files_and_codes\Files and Codes\Projects\q\EF_CodeFirst\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:781
char:5
+ $dispatcher = $utilityAssembly.CreateInstance(
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : InvokeMethodOnNull
Join-Path : Cannot bind argument to parameter 'Path' because it is null.
At D:\Programming\AspMVC\files_and_codes\Files and Codes\Projects\q\EF_CodeFirst\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:810
char:20
+ (Join-Path $runner.ToolsPath EntityFramework.PowerShell.dll),
+ ~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidData: (:) [Join-Path], ParameterBindingValidationException
+ FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.JoinPathCommand
推荐答案
这个问题与Visual Studio有关，我建议你在Visual Studio论坛中打开一个案例 https://social.msdn.microsoft.com/Forums/vstudio/en-US/home?category=visualstudio
This problem is more related to Visual Studio, I suggest you opening a case in Visual Studio forum at https://social.msdn.microsoft.com/Forums/vstudio/en-US/home?category=visualstudio
最好的问候，
Teige
这篇关于无法找到类型[NuGet.VisualStudio.IVsPackageInstallerServices]。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！