如何遍历和更新列表 [英] How to iterate and update a list

问题描述

我有这个问题很多随着时间的推移，如果我重复一个列表，和修改的过程中列表导致异常。

I have had this problem lots over time, if I iterate a list, and modify the list in the process it causes an exception.

List<string> list = new List<string>()
                                {
                                    "one",
                                    "two",
                                    "three"
                                };

        foreach (string item in list)
        {
            if (item == "two")
            {
                list.Remove(item);
            }
        }

我已经提出了自己的解决方案，而是希望听到你的解决方案。

I have come up with my own solutions, but interested to hear your solutions.

推荐答案

那么你可以在这种情况下，使用LINQ：

Well you could use linq in this case:

list = list.Where(s => s != "two").ToList();

在很长的路要走它是构建项目的第二列表中删除，然后再通过该列表中删除从第一个列表中的项目迭代。下面是一些例子code：

The long way to go about it would be to build a second list of items to remove, and then iterate through that list removing items from the first list. Here is some example code:

请注意，我强烈建议你用简单的LINQ的解决方案，而不是做这种方式，但如果由于某种原因，LINQ的是不是一种选择，你可以这样：

Please note, I highly recommend going with the simple Linq solution, and not doing it this way, but if for some reason Linq is not an option for you this should work:

List<string> toRemove = new List<string>();
foreach (string item in list)
{
    if (item == "two")
    {
        toRemove.Add(item);
    }
}

foreach(string item in toRemove)
{
    list.Remove(item);
}

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