c#16进制与字符串的互转

字符串转为16进制：

public static string GetHexFromChs(string s)
{
	if ((s.Length % 2) != 0)
	{
		s += " ";//空格
		//throw new ArgumentException("s is not valid chinese string!");
	}

	System.Text.Encoding chs = System.Text.Encoding.GetEncoding("gb2312");

	byte[] bytes = chs.GetBytes(s);

	string str = "";

	for (int i = 0; i < bytes.Length; i++)
	{
		str += string.Format("{0:X}", bytes[i]);
	}

	return str;
}

16进制转字符串：

private string GetChsFromHex(string hex)
{
	if (hex == null)
	{
		//throw new ArgumentException("hex is null!");
	}

	if (hex.Length % 2 != 0)
	{
		hex += "20";//空格
		//throw new ArgumentException("hex is not a valid number!", "hex");
	}

	// 需要将 hex 转换成 byte 数组。
	byte[] bytes = new byte[hex.Length / 2];

	for (int i = 0; i < bytes.Length; i++)
	{
		try
		{
			// 每两个字符是一个 byte。
			bytes[i] = byte.Parse(hex.Substring(i * 2, 2),
			System.Globalization.NumberStyles.HexNumber);
		}
		catch
		{
			// Rethrow an exception with custom message.
			throw new ArgumentException("hex is not a valid hex number!", "hex");
		}
	}

	// 获得 GB2312，Chinese Simplified。
	Encoding chs = System.Text.Encoding.GetEncoding("GB2312");

	return chs.GetString(bytes);
}