private string[] GetUserUnit(string domainADsPath, string username, string password, string schemaClassNameToSearch)
        {
            SearchResultCollection results = _ADHelper(domainADsPath, username, password, schemaClassNameToSearch);
            string[] sRe = GetGetUserUnitResults(results);

            results.Dispose();

            return sRe;
        }

        private string[] GetGetUserUnitResults(SearchResultCollection results)
        {
            string sRe = string.Empty;
            if (results.Count == 0)
                throw new Exception("域中没有任何用户");
            else
            {
                foreach (SearchResult result in results)
                {
                    string adPath = result.Path;
                    if (adPath.IndexOf("OU=用户") < 0)
                        continue;
                    //“组织名,登录名,用户名,邮件地址”
                    // 分解Path得到组织名
                    string[] sSplit = adPath.Split(',');
                    string orz = string.Empty;
                    if (sSplit.Length > 2)
                    {
                        orz = sSplit[1].Split('=')[1];
                    }
                    ResultPropertyCollection propColl = result.Properties;
                    if (propColl["samaccountname"].Count > 0)
                        orz += "," + propColl["samaccountname"][0].ToString();
                    if (propColl["name"].Count > 0)
                        orz += "," + propColl["name"][0].ToString();
                    if(propColl["mail"].Count > 0)
                        orz += "," + propColl["mail"][0].ToString();
                    sRe += orz + "=";
                }
            }
            if (sRe.Length > 0)
                sRe = sRe.Substring(0, sRe.Length - 1);
            return sRe.Split('=');
        }