C# 十进制和十六进制转换

1 int a = 100;
2 String strA = a.ToString("x8");

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

1         /// <summary>
2         /// 十六进制换算为十进制
3         /// </summary>
4         /// <param name="strColorValue"></param>
5         /// <returns></returns>
6         public static int GetHexadecimalValue(String strColorValue)
7         {
8             char[] nums = strColorValue.ToCharArray();
9             int total = 0;
10             try
11             {
12                 for (int i = 0; i < nums.Length; i++)
13                 {
14                     String strNum = nums[i].ToString().ToUpper();
15                     switch (strNum)
16                     {
17                         case "A":
18                             strNum = "10";
19                             break;
20                         case "B":
21                             strNum = "11";
22                             break;
23                         case "C":
24                             strNum = "12";
25                             break;
26                         case "D":
27                             strNum = "13";
28                             break;
29                         case "E":
30                             strNum = "14";
31                             break;
32                         case "F":
33                             strNum = "15";
34                             break;
35                         default:
36                             break;
37                     }
38                     double power = Math.Pow(16, Convert.ToDouble(nums.Length - i - 1));
39                     total += Convert.ToInt32(strNum) * Convert.ToInt32(power);
40                 }
41
42             }
43             catch (System.Exception ex)
44             {
45                 String strErorr = ex.ToString();
46                 return 0;
47             }
48
49
50             return total;
51         }