After updating Visual Studio IntelliSense stopped working in one XAML file where about 2220 lines of code. It works in other files and starts working when I delete part of the code. I tried to delete the .vs folder, delete and add this file and it didn't help
IntelliSense doesn't work in large XAML file
Please try these steps:
Suggestion
1) Close VS Instance, delete bin and obj folder and then restart your project.
2) Right-click on the XAML file in the Solution Explorer and then select Open With>Source Code (Text) Editor and set it as default.
3) Right click the XAML file>Properties>Build Action>change it to something else and back
4) Add a new xaml file under this specific project and check if its intellisense works or not.
5) If you use Resharper Extension, please disable it under Extensions-->Manage Extensions and then restart your VS.