利用C#編寫查詢IP所在區段

　　編程語言C#
類    別(網絡應用實用算法)
主要功能查詢一個IP所有的IP段 關鍵:從Byte數組到ulong的轉換出來的數字和 IPAddressAddress 返回值的是不一樣的

　　 using System;
using SystemCollectionsGeneric;
using SystemText;
using SystemNet;

　　namespace IPUtility
{
    class Program
    {
        static void Main(string[] args)
        {
            IPRangeManage irm = new IPRangeManage();
            irmAdd(new IPRange(石家莊 ));
            irmAdd(new IPRange(石家莊 ));
            irmAdd(new IPRange(唐山 ));
            irmAdd(new IPRange(保定 ));

　　ConsoleWriteLine(irmSearch()Name);

　　ConsoleReadLine();

　　}
    }

　　public class IPRange
    {
        private string _Name = stringEmpty;

　　private ulong _BeginIP = ;

　　private ulong _EndIP = IntMaxValue;

　　/**//// <summary>
        /// IP段名稱
        /// </summary>
        public string Name
        {
            get { return _Name; }
            set { _Name = value; }
        }

　　/**//// <summary>
        /// ?始IP
        /// </summary>
        public ulong BeginIP
        {
            get { return _BeginIP; }
            set { _BeginIP = value; }
        }

　　/**//// <summary>
        /// ?束IP
        /// </summary>
        public ulong EndIP
        {
            get { return _EndIP; }
            set { _EndIP = value; }
        }

　　/**//// <summary>
        /// 此IP段的范?
        /// </summary>
        public ulong Range
        {
            get
            {
                return EndIP BeginIP;
            }
        }

　　public IPRange(string name string ipBegin string ipEnd)
        {
            thisName = name;
            thisBeginIP = IPA(ipBegin);
            thisEndIP = IPA(ipEnd);
        }

　　public static ulong IPA(string ip)
        {
            byte[] bytes = IPAddressParse(ip)GetAddressBytes();
            ulong ret = ;

　　foreach (byte b in bytes)
            {
                ret <<= ;
                ret |= b;
            }

　　return ret;

　　}

　　public static int Compare(IPRange x IPRange y)
        {
            if(xRange == yRange)
                return ;
            else if(xRange > yRange)
                return ;
            else return ;
        }

　　}

　　public class IPRangeManage
    {
        public IPRangeManage()
        { }

　　private List< IPRange> _IPRangeList = new List< IPRange>();
        private bool _NeedSort = true;

　　public void Add(IPRange ipRange)
        {
            _IPRangeListAdd(ipRange);
            _NeedSort = true;
        }

　　private void Sort()
        {
            if (_NeedSort)
            {
                _IPRangeListSort(new Comparison<IPRange>(IPRangeCompare));
            }
        }

　　public IPRange Search(string ipString)
        {
            ulong ip = IPRangeIPA(ipString);

　　thisSort();

　　foreach (IPRange ir in _IPRangeList)
            {
                if (irBeginIP <= ip && irEndIP >= ip)
                {
                    return ir;
                }
            }

　　return null;
        }
    }
}

From:http://tw.wingwit.com/Article/program/net/201311/12757.html