private int SumOfSegments(ArraySegment<int>[] segments)
{
  int sum = 0;
  foreach(ArraySegment<int> segment in segments)
  //循环存放数组段的数组
  {
 for (int i = segment.Offset; i < segment.Offset +
  segment.Count; i++)
 //处理数组段,Offset为在元素数组中的起始位置
 //Count为要提取的个数
 //Arary为原始数组
 {
   sum += segment.Array[i];
   //计算元素之和
 }
  }
  return sum;
}

private void button1_Click(object sender, EventArgs e)
{
  int[] arr1 = new int[] { 1,4,5,11,14,18};
  int[] arr2 = new int[] {3,4,5,18,21,27,33 };
  //定义数组段的数组
  var segments = new ArraySegment<int>[2]
  {
 new ArraySegment<int>(arr1,0,3),
 new ArraySegment<int>(arr2,3,3)
  };
  var sum=SumOfSegments(segments);
  MessageBox.Show(sum.ToString());
}