Visual Studio Code IntelliSense suggestions don't pop up automatically

Question

I followed the install instructions in https://code.visualstudio.com, but when I write C# code, the IntelliSense suggestions don't pop up automatically, so I must trigger it by using shortcut Command+Space, meanwhile, the suggestions are just from the code I wrote.

Here is the screen capture below:

I checked in https://code.visualstudio.com/Docs/editingevolved, VSCode do support C# IntelliSense.

I don't think it is bug, maybe I did something wrong when installing VSCode. How to solve this problem?

Answer 1

To activate IntelliSense on a .NET project:

1. Open project folder: File->Open folder...
2. Click on the flame on your bottom left corner, pick your project
3. IntelliSense activated!

From what I've seen, IntelliSense cannot be activated on a .cs file alone. (See @natemcmaster's answer).

Answer 2

OmniSharp doesn't know where your project files are. In your screenshot, the left sidebar says "You have not opened a folder". OmniSharp will look in your currently opened folder for project files.

1. Add your folder. File > Open Folder...
2. Make sure you have a project file (either project.json or your *.csproj files).

This should be enough for OmniSharp to start providing you Intellisense.