分享一个IPv4地址和长整形转换的类

public class IPAddressPlus { public static long StringToLong(string _ip) { IPAddress _ipAddress = null; if (IPAddress.TryParse(_ip, out _ipAddress)) { byte[] _bytes = _ipAddress.GetAddressBytes(); long _a = long.Parse(((int)_bytes[0]).ToString()); long _b = long.Parse(((int)_bytes[1]).ToString()); long _c = long.Parse(((int)_bytes[2]).ToString()); long _d = long.Parse(((int)_bytes[3]).ToString()); return _a * 256 * 256 * 256 + _b * 256 * 256 + _c * 256 + _d; } else { return 0; } } public static string Long2String(long _ip) { int[] _bytes = new int[4]; _bytes[0] = (int)((_ip >> 24) & 0xff); _bytes[1] = (int)((_ip >> 16) & 0xff); _bytes[2] = (int)((_ip >> 8) & 0xff); _bytes[3] = (int)(_ip & 0xff); string _return = _bytes[0].ToString() + "." + _bytes[1].ToString() + "." + _bytes[2].ToString() + "." + _bytes[3].ToString(); return _return; }