从AD域获取用户AD信息

        public static Dictionary<string, string> SearchADInfo(string adName)
        {
            string strTemp = "LDAP://xxx.xxx.com";
            DirectoryEntry entry = new DirectoryEntry(strTemp, ADUserName, ADPassword);
            entry.AuthenticationType = AuthenticationTypes.Secure;
            entry.RefreshCache();

            var src = new System.DirectoryServices.DirectorySearcher(entry);
            //(SAMAccountName=" + adName + ")
            src.Filter = "(SAMAccountName=" + adName + ")";
            src.PageSize = 10000;//   此参数可以任意设置，但不能不设置，如不设置读取AD数据为0~999条数据，设置后可以读取大于1000条数据。

            var result = src.FindOne();
            var ret = new Dictionary<string, string>();
            var de = result.GetDirectoryEntry();
            foreach (DictionaryEntry obj in result.Properties)
            {
                var value = string.Empty;
                foreach (Object obj2 in (ResultPropertyValueCollection)obj.Value)
                {
                    value += obj2.ToString();
                }
                ret.Add(obj.Key.ToString(), value.ToString());
            }
            return ret;
        }
    }