If I'm not wrong, window services are started when the computer boots. So, if I try to get Environment.UserName before a user has logged in, will it return something or will it throw an exception? If it is the former, what would it return?

CodePudding user response：

Anything running in Windows is executing as some account, and services are no different -- which account in specific depends on how the service was started and configured.

See here for more info: https://docs.microsoft.com/en-us/windows/win32/services/service-user-accounts