尝试为 VS2019 安装扩展会导致 NullReferenceException [英] Attempting to Install an extension to VS2019 results in a NullReferenceException

问题描述

自 VS 2019 发布以来，我一直无法向其添加扩展.我最近更新到了 16.4.3 版，但在尝试添加扩展时仍然出现相同的错误.

I've not been able to add extensions to my VS 2019 since its release. I recently updated to Version 16.4.3 but I still get the same error when I try to add extensions.

我尝试执行以下操作，但仍然失败并显示上面的错误对话框.

I've tried to do the following but it still fails with an error dialog above.

• 从 Visual Studio 中的扩展管理器安装；
• 从 MarketPlace 下载扩展程序并双击安装；
• 在 VS 2019 Developer Command Prompt 管理模式下使用 VSIXInstaller.exe 命令行进行安装.

这是我从安装日志中得到的.

This is what I get from the install log.

System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.VisualStudio.Setup.Cache.Instance.get_SupportsExtensions()
   at VSIXInstaller.SetupExtensions.GetLaunchableInstances(IQuery query)
   at VSIXInstaller.SupportedSKUs.EnumerateIsolatedInstalls(Action`1 callback)
   at VSIXInstaller.SupportedSKUs.AddInstalledLocationBasedSKUs(IntPtr userToken)
   at VSIXInstaller.SupportedSKUs.InitializeSupportedSKUs(IntPtr userToken)
   at VSIXInstaller.ExtensionService.InitializeSupportedSKUs(ICommandLineData cmdLineData, IntPtr duplicatedUserToken)
   at VSIXInstaller.App.Initialize(Boolean isRepairSupported)
   at VSIXInstaller.App.Initialize()
   at System.Threading.Tasks.Task`1.InnerInvoke()
   at System.Threading.Tasks.Task.Execute()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)

到目前为止我尝试安装的每个 VS2019 扩展都给了我这个错误.为 VS2017 安装扩展程序也不例外.

Every VS2019 extension I've tried to install so far has given me this error. Installing extensions to VS2017 is no different.

推荐答案

我遇到了同样的问题，这个解决方案解决了我的问题，虽然很长，但对我有用.

I had the same problem and this solution solved my problem, it is a long one, but worked for me.

Visual Studio 2019(社区版) - 无法安装/更新扩展

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