判断用户是否在AD中存在

 

            DirectoryEntry de = new DirectoryEntry("LDAP://" + ConfigurationManager.AppSettings["MossDomain"].ToString());
            de.Username=ConfigurationManager.AppSettings["MossDomain"].ToString() + @"\" + ConfigurationManager.AppSettings["MossUserName"].ToString();
            de.Password= ConfigurationManager.AppSettings["MossUserPWD"].ToString();
            DirectorySearcher deSearch = new DirectorySearcher();
            deSearch.SearchRoot = de;
            deSearch.Filter = "(&(objectClass=user) (cn=" + UserName + "))";
            SearchResultCollection results = deSearch.FindAll();
            if (results.Count == 0)
            {
                return false;
            }
            else
            {
                return true;
            }