C# Raspberry pi Linux serial port permission denied even as root

Question

I am writing a program trying to communicate with serial ports of the raspberry pi. The program can find the device linked to the port. But when I want to open that port, it threw me an exception saying that the serial port can't be opened, permission denied. I logged as root(pi) and I think I added myself to "dialout". However nothing worked. What will be the problem of my situation? Hope there's any could help, thanks in advance.

Answer 1

如果我没记错的话，您必须是特定组的成员。