How do I get a list of local Windows users?

Question

I'm trying to write a faster user switching app for Windows. Win+L and selecting users is very cumbersome. If I start Task Manager as administrator, it shows active users and I can select one and "Connect" (if I enter their password).

How do I get the list of all users (or all active users)?

I'm using C# (Visual Studio Express).

Answer 1

I'd try WTSEnumerateSessions to get all available sessions.

Answer 2

You can also use NetWkstaUserEnum to see all users currently logged in; it's not really necessarily better, but it's another option. It has one advantage that it will work on older systems which don't support terminal services, but that's probably not an issue if you're using C#. :)

Answer 3

If you'd rather not deal with the P/Invokes, you can use Cassia, which wraps the ugly for you:

using Cassia;

foreach (ITerminalServicesSession session in new TerminalServicesManager().GetSessions())
{
    if (!string.IsNullOrEmpty(session.UserName))
    {
        Console.WriteLine("Session {0} (User {1})", session.SessionId, session.UserName);
    }
}