如何遍历列表框中的项目，然后删除这些项目?

问题描述

我在尝试遍历列表框然后删除项目时遇到以下错误.

I'm getting the error below when trying to loop through a listbox and then remove the item.

此枚举器绑定的列表已被修改.枚举器只能在列表不变的情况下使用.

List that this enumerator is bound to has been modified. An enumerator can only be used if the list does not change.

foreach (string s in listBox1.Items)
{
    MessageBox.Show(s);
    //do stuff with (s);
    listBox1.Items.Remove(s);
}

如何删除项目并仍然循环浏览内容?

How can I remove the item and still loop through the contents?

推荐答案

要删除所有项目吗?如果是这样，请先执行 foreach，然后使用 Items.Clear() 将它们全部删除.

Do you want to remove all items? If so, do the foreach first, then just use Items.Clear() to remove all of them afterwards.

否则，可能会被索引器向后循环:

Otherwise, perhaps loop backwards by indexer:

listBox1.BeginUpdate();
try {
  for(int i = listBox1.Items.Count - 1; i >= 0 ; i--) {
    // do with listBox1.Items[i]

    listBox1.Items.RemoveAt(i);
  }
} finally {
  listBox1.EndUpdate();
}

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