/// 
/// IP地址转换成数字/// 
/// IP地址/// 
     
      数字,输入无效IP地址返回0
     public static uint IPToID(string addr){    IPAddress IP;    if(!IPAddress.TryParse(addr,out IP))        return 0;    byte[] bInt = IPAddress.Parse(addr).GetAddressBytes();    if (BitConverter.IsLittleEndian)        Array.Reverse(bInt);    return BitConverter.ToUInt32(bInt,0);}/// 
/// 数字转换成IP地址/// 
/// 数字/// 
     
      IP地址
     public static string IDToIP(uint address){    string str=string.Empty;    try     {        return str = IPAddress.Parse(address.ToString()).ToString();    }    catch (FormatException)    {        return str = "不是有效的IP地址";    }}

调用演示：

Console.WriteLine("192.168.0.1转数字：{0}\r\n数字转IP：{1}",IPToID("192.168.0.1"),IDToIP("3232235521"));