如何输出奇数和偶数的数字列表?C# [英] How to output a List of numbers in odd and even? C#

问题描述

我在这里可能不太合适，但是当我稍加修改后，MS网站上的此代码对我不起作用.对不起，将近凌晨2点.int应该是什么变量?程序崩溃，指出指定的转换无效."

I might be way off base here but this code on the MS site doesn't work for me when I modified it a little. Sorry its almost 2am. What variable should the int be? The program crashes stating "Specified cast is not valid."

ArrayList OddEven = new ArrayList();

            foreach (int i in lbList.Items)
            OddEven.Add(i);
            foreach (int i in OddEven)
            {
                if (i % 2 == 0)
                    lbEven.Items.Add(i);
                else
                    lbOdd.Items.Add(i);
            }

推荐答案

lbList.Items 可能是 strings ，并隐式转换为 int 不存在.
试试这个:

lbList.Items are probably strings and an implicit cast to int doesn't exist.
Try this:

ArrayList OddEven = new ArrayList();

foreach (var i in lbList.Items)
  OddEven.Add(int.Parse(i.ToString()));

foreach (int i in OddEven)
{
  if (i % 2 == 0)
    lbEven.Items.Add(i);
  else
    lbOdd.Items.Add(i);
}

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