你能从列表中删除一个项目吗<>在 C# 中迭代​​它时

Can you remove an item from a Listlt;gt; whilst iterating through it in C#(你能从列表中删除一个项目吗lt;gt;在 C# 中迭代​​它时)

问题描述

您能否在迭代时从列表中删除一个项目<>?这会起作用吗，还是有更好的方法来做到这一点?

Can you remove an item from a List<> whilst iterating through it? Will this work, or is there a better way to do it?

我的代码:

foreach (var bullet in bullets)
  {
    if (bullet.Offscreen())
    {
      bullets.Remove(bullet);
    }
  }

-edit- 抱歉各位，这是给 Silverlight 游戏的.我没有意识到 silverlight 与 Compact Framework 不同.

-edit- Sorry guys, this is for a silverlight game. I didn't realise silverlight was different to the Compact Framework.

推荐答案

编辑:澄清一下，问题是关于 Silverlight，它显然不支持 RemoveAll on List`T.它在 完整框架、CF、XNA 2.0+ 版本中可用

Edit: to clarify, the question is regarding Silverlight, which apparently does not support RemoveAll on List`T. It is available in the full framework, CF, XNA versions 2.0+

您可以编写一个表达您的删除标准的 lambda:

You can write a lambda that expresses your removal criteria:

bullets.RemoveAll(bullet => bullet.Offscreen());

或者你可以选择你想要的，而不是删除你不想要的:

Or you can select the ones you do want, instead of removing the ones you don't:

bullets = bullets.Where(b => !b.OffScreen()).ToList();

或者使用索引器在序列中向后移动:

Or use the indexer to move backwards through the sequence:

for(int i=bullets.Count-1;i>=0;i--)
{
    if(bullets[i].OffScreen())
    {
        bullets.RemoveAt(i);
    }
}

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