求List<int>中相等且连续的偶数的索引

 1 using System;
 2 using System.Text;
 3 using System.Collections.Generic;
 4 
 5 namespace CSharpProject
 6 {
 7     class Program
 8     {
 9         static void Main(string[] args)
10         {
11             List<int> list = new List<int>() { 0, 0, 3, 5, 4, 4, 4, 3, 6, 6, 5, 8, 8 };
12             StringBuilder sb = new StringBuilder();
13             GetCloseEqualityEvenNumIndexFromList(list, ref sb);
14             Console.WriteLine(sb.ToString());
15 
16             Console.ReadKey();
17         }
18 
19         //计算List<int>中相等且连续的偶数的索引 比如 {3,5,4,4,4,3,6,6,5} 结果是：{2,3,4,6,7}
20         static void GetCloseEqualityEvenNumIndexFromList(List<int> list, ref StringBuilder sb)
21         {
22             if (null == sb)
23                 sb = new StringBuilder();
24 
25             if (null != list)
26             {
27                 int i = 0, iMax = 0, index = 0, counter = 0;
28                 int currVal = 0, nextVal = 0;
29                 sb.Append("{");
30                 for (i = 0, iMax = list.Count; i < iMax; i += (counter + 1))
31                 {
32                     currVal = list[i];
33                     counter = 0;
34                     for (index = i + 1; index < iMax; ++index)
35                     {
36                         nextVal = list[index];
37                         if (currVal == nextVal && currVal % 2 == 0 && nextVal % 2 == 0)
38                         {
39                             ++counter;
40                             if (index - i <= 1)
41                                 sb.Append(i.ToString() + ",");
42                             sb.Append((i + counter).ToString() + ",");
43                         }
44                         else
45                         {
46                             break;
47                         }
48                     }
49                 }
50                 sb.Remove(sb.Length - 1, 1);
51                 sb.Append("}");
52             }
53         }
54     }
55 }