c# - 索引越界问题

Question

我依次有以下两个 for 循环。当我单独运行时，第一个 for 循环起作用，这很奇怪。但是当我单独运行第二个循环时，我得到了一个索引超出范围的异常错误。有人可以帮我检查错误是什么吗？非常感谢!

for (i = NiPricePointer; i < 551; i++)  
   {
      tempUpper = tempUpper + NiPriceCounter[i];
      if (tempUpper >= (NiPriceRounds * 0.3))
      {
          chart3.Series["Upper 30%"].Points.AddXY(k * 500, ((i - 1) * 0.1 + 5));
          break;
      }
 }

for (i = NiPricePointer; i>0; i--) //This loop always gives me out of range problems.
 {
      tempLower = tempLower + NiPriceCounter[i];
      if (tempLower >= (NiPriceRounds * 0.3))
      {
          chart3.Series["Lower 30%"].Points.AddXY(k * 500, ((i - 1) * 0.1 + 5));
          break;
       }
 }

数组的初始化:

int[] NiPriceCounter = new int[551];

非常感谢!

Answer 1

我想，NiPricePointer 只是大于 550。您的两个循环都应包含两个边界作为检查:

for (i = NiPricePointer; i < 551 && i >=0; i++)  

和

for (i = NiPricePointer; i < 551 && i >=0 ; i--)