判断用户ip是否在指定的ip段内

用过c#的代码判断用户ip是否在指定的ip段内

 1        /**//// <summary>
 2        /// 检测用户ip是否在指定的ip段中
 3        /// </summary>
 4        /// <param name="ip">用户ip</param>
 5        /// <param name="begip">起始ip</param>
 6        /// <param name="endip">结束ip</param>
 7        /// <returns></returns>
 8        protected bool isinip(string ip, string begip, string endip)
 9        {
            int[] inip, begipint, endipint = new int[4];
            inip = getIp(ip);
            begipint = getIp(begip);
            endipint = getIp(endip);
            for (int i = 0; i < 4; i++)
            {
                if (inip[i] < begipint[i] || inip[i] > endipint[i])
                {
                    return false ;
                }
                else if (inip[i] > begipint[i] || inip[i] < endipint[i])
                {
                    return true;
                }
            }
            return true;
        }

其中还会用到函数getIp

 1        /**//// <summary>
 2        /// 将ip地址转成整形数组
 3        /// </summary>
 4        /// <param name="ip"></param>
 5        /// <returns></returns>
 6        protected int[] getIp(string ip)
 7        {
 8            int[] retip = new int[4];
 9            int i,count;
            char c;
            for (i = 0,count=0; i < ip.Length; i++)
            {
                c = ip[i];
                if (c != '.')
                {
                    retip[count] = retip[count] * 10 + int.Parse(c.ToString());
                }
                else
                {
                    count++;
                }
            }

            return retip;
            
        }