vs 无法添加引用

最近新装了2017，开始前几天还好，可是最近在添加引用时，报错

---------------------------
Microsoft Visual Studio
---------------------------

未能正确加载“ReferenceManagerPackage”包。

此问题可能是因配置更改或安装另一个扩展导致的。可通过查看文件“C:\Users\Administrator\AppData\Roaming\Microsoft\VisualStudio\15.0_3dfc125b\ActivityLog.xml”来获取详细信息。

重新启动 Visual Studio 可帮助解决此问题。

继续显示此错误消息吗?
---------------------------
是(Y) 否(N) 
---------------------------

找了百度及google 最后终于让我找到了 解决方案 原文：

安装完visual studio 2017 后添加引用总是提示 未能加载包ReferenceManagerPackage，这个问题困扰了两天，直到在网上看到了下面这一段

I just got this error after installation of Visual Studio 2017.

The solution was as follows.

• Launch Developer Command Prompt for VS 2017
• CD C:\Program Files\Microsoft Visual Studio\2017\Community\Common7\IDE\PublicAssemblies
• Run gacutil -i Microsoft.VisualStudio.Shell.Interop.11.0.dll

You should now see

Microsoft (R) .NET Global Assembly Cache Utility.  Version 4.0.30319.0
Copyright (c) Microsoft Corporation.  All rights reserved.

Assembly successfully added to the cache
Restart Visual Studio and hopefully all will be well and you can add references.

The file C:\Users\USER\AppData\Roaming\Microsoft\VisualStudio\15.0_cc9cc69a\ActivityLog.xml is useful for debugging any other assemblies that may be causing the issue. Annoyingly it's very tempting to click No when asked never to see the error message again, which will suppress the error and this path so I thought I'd post it here for reference.

废话不多说，来看下具体的解决方案：

1、打开VS2017下的Developer Command Prompt for VS 2017

2、然后在CMD窗口输入

CD CD C:\Program Files\Microsoft Visual Studio\2017\Community\Common7\IDE\PublicAssemblies 然后回车（注：这里的CD C:\Program Files\Microsoft Visual Studio\2017\Community\Common7\IDE\PublicAssemblies 是你的安装目录下的路径 ， 如：我是安装在D盘下的VS017，那么我的路径就是 D:\工作软件\vs2017\Common7\IDE\PublicAssemblies）

然后回车

3、再然后在CMD窗口输入 gacutil -i Microsoft.VisualStudio.Shell.Interop.11.0.dll 回车，得到下图的结果

4、最后一步，重启VS2017 就OK了！