方法1：

int ? d=10; ?
? ?
? d.ToString("x") ? //或把x改為Ｘ，，，就變成了１６位的字符串了． ?
? ?
? int ? x=Convert.ToInt32(d.ToString("x"),16);／／把１６進制的字符串變回１０進制的．

?

方法2：

?

Code
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());???
??????????????????????????}???
??????????????????}

?

總結

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