经过一天的挫败，我发现我想在HDD上节省空间是贪婪的问题-我在安装过程中未选中Blend安装.

After a day of frustration I found out that my greed to save space on HDD was the issue - I have unchecked Blend install during setup.

解决方案: 安装blend(您可以通过同一设置将它作为功能添加到VS的现有安装中)

Solution: Install blend (you can add it as a feature to an existing instalation of VS through same setup)

在我安装了blend之后，XAML intellisense开始按预期工作.希望这可以为某人节省一些时间.

And after I installed blend, XAML intellisense started working as expected. Hope this saves some time for someone.