在C#中，十進位制和十六進位制轉換非常簡單，方法如下：

十進位制轉為十六進位制：

1 int a = 100;

2 String strA = a.ToString("x8");

十六進位制轉為十進位制：

1 int b= Int32.Parse("266", System.Globalization.NumberStyles.HexNumber);

也可以使用下述方法：

/// <summary>

/// 十六進位制換算為十進位制

/// </summary>

/// <param name="strColorValue"></param>

/// <returns></returns>

public static int GetHexadecimalValue(String strColorValue)

{

char[] nums = strColorValue.ToCharArray();

int total = 0;

try

{

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

{

String strNum = nums[i].ToString().ToUpper();

switch (strNum)

{

case "A":

strNum = "10";

break;

case "B":

strNum = "11";

break;

case "C":

strNum = "12";

break;

case "D":

strNum = "13";

break;

case "E":

strNum = "14";

break;

case "F":

strNum = "15";

break;

default:

break;

}

double power = Math.Pow(16, Convert.ToDouble(nums.Length - i - ));

total += Convert.ToInt32(strNum) * Convert.ToInt32(power);

}

}

catch (System.Exception ex)

{

String strErorr = ex.ToString();

return 0;

}

return total;

}