特里萨，我认为这是你在找什么...

Theresa, I think this is what you're looking for...

AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);

WindowsPrincipal principal = (WindowsPrincipal)Thread.CurrentPrincipal;
WindowsIdentity identity = (WindowsIdentity)principal.Identity;

String userName= principal.Identity.Name;