以下方法實現判斷一個IP是否被一個IP區間所包含

有一些靜態方法可能引用了同名空間的自定義的類，

至于合并兩個相臨的IP段，可對其中的最大或最小IP+1

using System;
using System.Text.RegularExpressions;

namespace HKH.Common
{
?/// <summary>
?/// clsMacAndIP 的摘要說明。
?/// </summary>
?public class clsIPAddress
?{
??private clsIPAddress()
??{
??}

??#region 判斷是否合法 IP

??/// <summary>
??/// 判斷是否合法 IP
??/// </summary>
??/// <param name="strIP"></param>
??/// <returns></returns>
??public static bool ValidateIPAddress(string strIP)
??{
???if ( null == strIP || "" == strIP.Trim() || Convert.IsDBNull(strIP) )
????return false;

???return Regex.IsMatch(strIP,@"^((/d{1,2}|1/d/d|2[0-4]/d|25[0-5])/.){3}(/d{1,2}|1/d/d|2[0-4]/d|25[0-5])$");
??}

??#endregion

??#region 轉換成數值

??/// <summary>
??///? 轉換為數值
??/// </summary>
??/// <param name="IPAddr"></param>
??/// <returns></returns>
??public static uint TransNum(string IPAddr)
??{
???if ( !ValidateIPAddress(IPAddr) )
????throw new Exception("IP Address isn't Well Format!");

???string[] IPStrArray = new string[4];
???IPStrArray = IPAddr.Split('.');
???return MAKELONG(MAKEWORD(byte.Parse(IPStrArray[3]),byte.Parse(IPStrArray[2])),MAKEWORD(byte.Parse(IPStrArray[1]),byte.Parse(IPStrArray[0])));
??}

??#endregion

??#region 格式化

??/// <summary>
??/// 格式化
??/// </summary>
??/// <param name="IPAddr"></param>
??/// <returns></returns>
??public static string Format(string IPAddr)
??{
???if (IPAddr[0] == '.')
????IPAddr = "0" + IPAddr;

???if (IPAddr[IPAddr.Length - 1] == '.')
????IPAddr += "0.0.0.";
???else
????IPAddr += ".0.0.0.";

???IPAddr = IPAddr.Substring(0,clsString.IndexOf(IPAddr,".",4));

//???//去掉無用的0
//???IPAddr = Regex.Replace(IPAddr,"^0{1,2}","");
//???IPAddr = Regex.Replace(IPAddr,@"/.+0{1,2}",".");

???if ( ValidateIPAddress(IPAddr) )
????return IPAddr;

???return "0.0.0.0";
??}

??#endregion

??#region 比較兩個IP的大小

??/// <summary>
??/// 比較兩個IP的大小
??/// </summary>
??/// <param name="IP1"></param>
??/// <param name="IP2"></param>
??/// <returns></returns>
??public static int Compare(string IP1,string IP2)
??{
???if ( !(ValidateIPAddress(IP1) && ValidateIPAddress(IP2)))
????throw new Exception("IP Address isn't Well Format!");

???uint IPNum1 = TransNum(IP1);
???uint IPNum2 = TransNum(IP2);

???if (IPNum1 == IPNum2 )
????return 0;

???return IPNum1 > IPNum2 ? 1 : -1 ;
??}

??#endregion

??#region 判斷一個IP是否包含在指定IP區間內

??/// <summary>
??/// 判斷一個IP是否包含在指定IP區間內
??/// </summary>
??/// <param name="IPRegion"></param>
??/// <param name="IP"></param>
??/// <returns></returns>
??public static bool IsInclude(string[] IPRegion,string IP)
??{
???//驗證
???if ( null == IPRegion || null == IP || 0 == IPRegion.Length )
????return false;

???if ( !ValidateIPAddress(IP) )
????return false;

???if ( 1 == IPRegion.Length )
???{
????if ( !ValidateIPAddress(IPRegion[0]) )
?????return false;
????
????if ( 0 == Compare(IPRegion[0],IP) )
?????return true;
???}

???if ( !(ValidateIPAddress(IPRegion[0]) && ValidateIPAddress(IPRegion[1])) )
????return false;

???uint IPNum = TransNum(IP);
???uint IPNum1 = TransNum(IPRegion[0]);
???uint IPNum2 = TransNum(IPRegion[1]);

???//比較
???if ( Math.Min(IPNum1,IPNum2) <= IPNum && Math.Max(IPNum1,IPNum2) >= IPNum )
????return true;
???
???return false;
??}

??#endregion

??#region 判斷兩個IP區間是否重疊，重疊則返回合并區間，否則返回 NULL

??/// <summary>
??/// 判斷兩個IP區間是否重疊，重疊則返回合并區間，否則返回 NULL
??/// </summary>
??/// <param name="IPRegion1"></param>
??/// <param name="IPRegion2"></param>
??/// <returns></returns>
??public static string[] CheckOverlapAndMerge(string[] IPRegion1,string[] IPRegion2)
??{
???//驗證
???if ( null == IPRegion1 || null == IPRegion2 || 0 == IPRegion1.Length || 0 == IPRegion2.Length )
????return null;

???//分數組長度進行處理 =1 和 > 1
???if ( 1 == IPRegion1.Length )
???{
????if (!ValidateIPAddress(IPRegion1[0]))
?????throw new Exception("IP Address isn't Well Format!");

????if ( 1 == IPRegion2.Length )
????{
?????if (!ValidateIPAddress(IPRegion2[0]))
??????throw new Exception("IP Address isn't Well Format!");
?????
?????//相等
?????if ( Equals(IPRegion1[0],IPRegion2[0]) )
??????return IPRegion1;
????}
????// > 1
????else
????{
?????if ( !(ValidateIPAddress(IPRegion2[0]) && ValidateIPAddress(IPRegion2[1])) )
??????throw new Exception("IP Address isn't Well Format!");
?????
?????if ( IsInclude(IPRegion2,IPRegion1[0]) )
??????return IPRegion2;
????}
???}
???// >1
???else
???{
????if ( !(ValidateIPAddress(IPRegion1[0]) && ValidateIPAddress(IPRegion1[1])) )
?????throw new Exception("IP Address isn't Well Format!");

????if ( 1 == IPRegion2.Length )
????{
?????if (!ValidateIPAddress(IPRegion2[0]))
??????throw new Exception("IP Address isn't Well Format!");
?????
?????if ( IsInclude(IPRegion1,IPRegion2[0]) )
??????return IPRegion1;
????}
????// > 1
????else
????{
?????if ( !(ValidateIPAddress(IPRegion2[0]) && ValidateIPAddress(IPRegion2[1])) )
??????throw new Exception("IP Address isn't Well Format!");
?????
?????uint IPNum1_1 = TransNum(IPRegion1[0]);
?????uint IPNum1_2 = TransNum(IPRegion1[1]);
?????uint IPNum2_1 = TransNum(IPRegion2[0]);
?????uint IPNum2_2 = TransNum(IPRegion2[1]);
?????
?????#region 大小格式整理 IP[0] <= IP[1]

?????if ( IPNum1_1 > IPNum1_2 )
?????{
??????string stemp = IPRegion1[0];
??????IPRegion1[0] = IPRegion1[1];
??????IPRegion1[1] = stemp;

??????uint utemp = IPNum1_1;
??????IPNum1_1 = IPNum1_2;
??????IPNum1_2 = utemp;
?????}

?????if ( IPNum2_1 > IPNum2_2 )
?????{
??????string stemp = IPRegion2[0];
??????IPRegion2[0] = IPRegion2[1];
??????IPRegion2[1] = stemp;

??????uint utemp = IPNum2_1;
??????IPNum2_1 = IPNum2_2;
??????IPNum2_2 = utemp;
?????}

?????#endregion

?????#region 判斷合并

?????//互不包含
?????if ( IPNum1_1 > IPNum2_2 || IPNum1_2 < IPNum2_1 )
??????return null;

?????//合并
?????string[] result = new string[2];

?????result[0] = IPNum1_1 < IPNum2_1 ? IPRegion1[0] : IPRegion2[0] ;
?????result[1] = IPNum1_2 > IPNum2_2 ? IPRegion1[1] : IPRegion2[1] ;

?????return result;

?????#endregion
????}

???}

???return null;
??}

??#endregion

??#region 私有方法

??/// <summary>
??/// 移位轉換_8
??/// </summary>
??/// <param name="bLow"></param>
??/// <param name="bHigh"></param>
??/// <returns></returns>
??private static ushort MAKEWORD(byte bLow,byte bHigh)
??{
???return ((ushort) (((byte) (bLow)) | ((ushort) ((byte) (bHigh))) << 8));
??}

??/// <summary>
??/// 移位轉換_16
??/// </summary>
??/// <param name="bLow"></param>
??/// <param name="bHigh"></param>
??/// <returns></returns>
??private static uint MAKELONG(ushort bLow,ushort bHigh)
??{
???return ((uint) (((ushort) (bLow)) | ((uint) ((ushort) (bHigh))) << 16));
??}
??
??#endregion
?}
}

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