c# List<Tuple<string, double>> Foreach in one liner

Question

我想要以下代码：

List<Tuple<string, double>> historicalDailyHigh = new List<Tuple<string, double>>();

  foreach (var item in historicalDailyHigh)
                {
                    if (item.Item1.Contains(closestPreDailyHigh.ToString()))
                    {
                        closestPreDailyHighName = item.Item1;
                    }
                }

写在一行中，和这行类似，只是"closestPreDailyHighName"应该是一个字符串：

closestPreDailyHighName = historicalDailyHigh.Any(x => x.Item1.Contains(closestPreDailyHigh.ToString()));

有人可以告诉我怎么做吗？

Answer 1

从技术上讲，您的代码可以重写为

 closestPreDailyHighName = historicalDailyHigh
    .LastOrDefault(item => item.Item1.Contains(closestPreDailyHigh.ToString()))
   ?.Item1 ?? closestPreDailyHighName;

请注意，您不要将 break 放在 if 中，这就是将分配满足条件的 last 项。如果 item 的 none 满足条件，我们不更改 closestPreDailyHighName。

如果省略 break 是 打字错误 ，您可以输入

 closestPreDailyHighName = historicalDailyHigh
    .FirstOrDefault(item => item.Item1.Contains(closestPreDailyHigh.ToString()))
   ?.Item1 ?? closestPreDailyHighName;

并且如果保证 item 始终存在，您可以将 FirstOrDefault 更改为 First:

 closestPreDailyHighName = historicalDailyHigh
    .First(item => item.Item1.Contains(closestPreDailyHigh.ToString()))
    .Item1;

Answer 2

我的解决方案现在看起来像这样：

closestPreDailyHigh = historicalDailyHigh.Min(x => x.Item2);
closestPreDailyHighName = historicalDailyHigh.First(x => x.Item1.Contains(closestPreDailyHigh.ToString())).Item1;

感谢您的意见！

c# List<Tuple<string, double>> Foreach in one liner

c# List<Tuple<string, double>> Foreach in one liner

c#

foreach

tuples

one-liner