IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();
            string doname = ipGlobalProperties.DomainName;

            PrincipalContext principalContext = new PrincipalContext(ContextType.Domain, doname, "sunhaiming", "zhang.1219");

            ComputerPrincipal computerPrincipal = new ComputerPrincipal(principalContext);
            UserPrincipal userPrincipal = new UserPrincipal(principalContext);
            PrincipalSearcher principalSearcher = new PrincipalSearcher(userPrincipal);
            principalSearcher = new PrincipalSearcher(computerPrincipal);
            StringBuilder sb = new StringBuilder();
            foreach (ComputerPrincipal computerPrincipalSearchResult in principalSearcher.FindAll())
            {
                sb.AppendLine(string.Format("UPN:{0}", computerPrincipalSearchResult.UserPrincipalName));
                sb.AppendLine(string.Format("描述:{0}", computerPrincipalSearchResult.Description));
                sb.AppendLine(string.Format("是否启用:{0}", computerPrincipalSearchResult.Enabled));
                sb.AppendLine(string.Format("SAM账号名:{0}", computerPrincipalSearchResult.SamAccountName));
                sb.AppendLine(string.Format("名称:{0}", computerPrincipalSearchResult.Name));
                sb.AppendLine(string.Format("上次登录时间:{0}", computerPrincipalSearchResult.LastLogon));
            }
            computerPrincipal.Dispose();
            Console.WriteLine(sb.ToString());