C#中 以固定长度 取字符串中的数据

//使用指定步长走完字符串

//比如 把int数组通过","分割成为字符串。然后每次读取四位，直到读取全部字符串。

public static void testforeachArray() {

        int[] ins = { 1,2,3,4,5,6,7,8,9};
        string inStr = string.Join(",", ins);
        Console.WriteLine(inStr);

        int count = 4;
        int length = (int)Math.Ceiling((double)inStr.Length / count);

        Console.WriteLine(length);  // 5

        for (int i = 0; i < length; i++)
        {
            int start = count * i;
            //int end = start + count - 1;
            count = i == length-1 ? inStr.Length-i*count : count;
            Console.WriteLine(inStr.Substring(start,count));
        }
    }

结果：

1,2,3,4,5,6,7,8,9

5

1,2,

3,4,

5,6,

7,8,

9