System.Security.Principal 階層
System.Security.Principal.GenericIdentity ---- System.Security.Principal.IIdentity
System.Security.Principal.GenericPrincipal ---- System.Security.Principal.IPrincipal
System.Security.Principal.WindowsIdentity ---- System.Security.Principal.IIdentity, System.Runtime.Serialization.ISerializable, System.Runtime.Serialization.IDeserializationCallback
System.Security.Principal.WindowsImpersonationContext
System.Security.Principal.WindowsPrincipal ---- System.Security.Principal.IPrincipal
System.Security.Principal.PrincipalPolicy
System.Security.Principal.WindowsAccountType
System.Security.Principal.WindowsBuiltInRole