DirectorySearcher LDAP

        public static void GetUser()
        {
            const string ldapPath = "LDAP://ibm.com/DC=ibm,DC=com";  //LDAP服务器地址
            DirectoryEntry entry = new DirectoryEntry(ldapPath);
            DirectorySearcher mySearcher = new DirectorySearcher(entry);
            //查询用户缩略名称为Amy的用户
            mySearcher.Filter = "(&(objectCategory=person)(objectClass=user)(sAMAccountName=Amy))"; ;  //过滤条件
            foreach (SearchResult resEnt in mySearcher.FindAll())
            {
                Console.WriteLine(resEnt.GetDirectoryEntry().Name.ToString());
            } 
        }