C# ip converter

IpConverter.cs

static long ToInt(string addr)
{
  // careful of sign extension: convert to uint first;
  // unsigned NetworkToHostOrder ought to be provided.
  return (long) (uint) IPAddress.NetworkToHostOrder(
  (int) IPAddress.Parse(addr).Address);
}

static string ToAddr(long address)
{
  return IPAddress.Parse(address.ToString()).ToString();
  // This also works:
  // return new IPAddress((uint) IPAddress.HostToNetworkOrder(
  // (int) address)).ToString();
}

static void Main()
{
  //假设www.sharejs.com服务器ip地址为：64.233.187.99，换后的结果为1089059683
  Console.WriteLine(ToInt("64.233.187.99"));
  //1089059683转换后的结果为：64.233.187.99
  Console.WriteLine(ToAddr(1089059683));
}

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