Visual Studio Code Intellisense stopped to work on C# files

The C# language features in VS Code are provided by a service called OmniSharp .

A couple of things you could try:

A) Restart OmniSharp

1. Open the Command Palette (Ctrl + Shift + P)

2. Type Omnisharp: Restart OmniSharp

   

B) View OmniSharp Logs

1. Open Output Panel (Ctrl + ')

2. Select OmniSharp Log from the dropdown)

   

C) Enable OmniSharp Logging

1. Enabling C# debugger logging in Omnisharp

   "configurations": [
       {
           "...": "...",
           "logging": {
               "engineLogging": true
           }
       },
       { "...": "..." }
   ]