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【CSharp】查询IP所在区段

作者:东昌 / 发布于2015/11/13/ 1338

主要功能：查询一个IP所有的IP段. 关键:从Byte数组到ulong的转换出来的数字和 IPAddress.Address 返回值的是不一样的


	using System.Collections.Generic;
	using System.Text;
	using System.Net;
	namespace IPUtility
	{
	 class Program
	 {
	 static void Main(string[] args)
	 {
	 IPRangeManage irm = new IPRangeManage();
	 irm.Add(new IPRange("石家庄", "219.148.24.0", "219.148.63.255"));
	 irm.Add(new IPRange("石家庄", "222.222.0.0", "222.222.63.255"));
	 irm.Add(new IPRange("唐山", "219.148.64.0", "219.148.79.255"));
	 irm.Add(new IPRange("保定", "219.148.20.0", "219.148.23.255"));
	 Console.WriteLine(irm.Search("219.148.56.3").Name);
	 Console.ReadLine();
	 }

	}
	 public class IPRange
	 {
	 private string _Name = string.Empty;
	 private ulong _BeginIP = 0;
	 private ulong _EndIP = Int32.MaxValue;
	 /**//// <summary>
	 /// IP段名称
	 /// </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)
	 {
	 this.Name = name;
	 this.BeginIP = IP2A(ipBegin);
	 this.EndIP = IP2A(ipEnd);
	 }

	public static ulong IP2A(string ip)
	 {
	 byte[] bytes = IPAddress.Parse(ip).GetAddressBytes();
	 ulong ret = 0;
	 foreach (byte b in bytes)
	 {
	 ret <<= 8;
	 ret |= b;
	 }
	 return ret;
	 }

	public static int Compare(IPRange x, IPRange y)
	 {
	 if(x.Range == y.Range)
	 return 0;
	 else if(x.Range > y.Range)
	 return 1;
	 else return -1;
	 }
	 }
	 public class IPRangeManage
	 {
	 public IPRangeManage()
	 { }
	 private List< IPRange> _IPRangeList = new List< IPRange>();
	 private bool _NeedSort = true;
	 public void Add(IPRange ipRange)
	 {
	 _IPRangeList.Add(ipRange);
	 _NeedSort = true;
	 }
	 private void Sort()
	 {
	 if (_NeedSort)
	 {
	 _IPRangeList.Sort(new Comparison<IPRange>(IPRange.Compare));
	 }
	 }
	 public IPRange Search(string ipString)
	 {
	 ulong ip = IPRange.IP2A(ipString);
	 this.Sort();
	 foreach (IPRange ir in _IPRangeList)
	 {
	 if (ir.BeginIP <= ip && ir.EndIP >= ip)
	 {
	 return ir;
	 }
	 }
	 return null;
	 }

	}

	
	}

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