在foreach循环中删除列表中的项目C#

问题描述：

如果我在foreach循环中使用了某个项目，但无法使用该项目，则必须删除当前在foreach循环中的该项目.

If I use an item in a foreach loop and I can't use the item it has to delete the item that is currently in the foreach loop.

这是我现在拥有的代码:

This is the code that I have right now:

foreach (Line line in linelijst)
{
    try
    {
        if (line.ActorIndex() == 0)
        {
            line.setStartPoint(actorenlijst[0].getLinePoint()); //if actorenlijst[0] doesn't excist it has to delete the current line
        }
        if (line.ActorIndex() == 1)
        {
             line.setStartPoint(actorenlijst[1].getLinePoint()); //if actorenlijst[1] doesn't excist it has to delete the current line
        }
        if (line.ActorIndex() == 2)
        {
             line.setStartPoint(actorenlijst[2].getLinePoint()); //if actorenlijst[2] doesn't excist it has to delete the current line
        }
        Point start = line.getStartPoint();
        Point end = line.getEndPoint();
        Pen lijn = new Pen(Color.Black, 1);
        graphics.DrawLine(lijn, start, end);
    }
    catch
    {
         //delete current line from the list
    }
}

感谢您有兴趣帮助其他人:)

Thanks for your interest to help other people :)

答

尝试为需要删除的项目创建另一个临时列表，然后在完成循环后，只需删除临时列表中的项目即可.

Try just creating another temporary list for the items that need to be deleted then when your done looping you can just delete the ones in the temp list.

List<Type> temp = new List<Type>()
foreach(item in mainList)
{
   if (item.Delete)
   {
      temp.Add(item);
   }
}

foreach (var item in temp)
{
   mainList.Remove(item);
}

在foreach循环中删除列表中的项目C#

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