方法1：


	复制代码 代码如下:

	

	int d=10;

	d.ToString("x") //或把x改为Ｘ，，，就变成了１６位的字符串了．

	int x=Convert.ToInt32(d.ToString("x"),16);／／把１６进制的字符串变回１０进制的．


方法2：


	复制代码 代码如下:

	

	static void Main()

	{

	int i = 446;

	string hex = i.ToString( "X" /* or x * );

	Console.WriteLine( hex );

	int j = HexToInt( hex );

	Console.WriteLine( j );

	}

	static int HexToInt(string hex)

	{

	hex = Regex.Replace(hex, "^0x", "", RegexOptions.IgnoreCase);

	if (Regex.IsMatch(hex, "[g-z]", RegexOptions.IgnoreCase))

	{

	throw new Exception("Invalid Hexadecimal Expression.: 0x" + hex);

	}

	char[] chars = hex.ToUpper().ToCharArray();

	Array.Reverse(chars);

	int dec = 0;

	for (int i = 0; i < chars.Length; i++)

	{

	dec += HexMapping(chars[i]) * (int)Math.Pow(16, i);

	}

	return dec;

	}

	static int HexMapping(char c)

	{

	switch (c)

	{

	case '0':

	return 0;

	case '1':

	return 1;

	case '2':

	return 2;

	case '3':

	return 3;

	case '4':

	return 4;

	case '5':

	return 5;

	case '6':

	return 6;

	case '7':

	return 7;

	case '8':

	return 8;

	case '9':

	return 9;

	case 'A':

	return 10;

	case 'B':

	return 11;

	case 'C':

	return 12;

	case 'D':

	return 13;

	case 'E':

	return 14;

	case 'F':

	return 15;

	default :

	throw new Exception("Invalid Hexadecimal Character :" + c.ToString());

	}

	}