如何在集合中找到一定长度的元素？ [英] How to find the element of certain length in a collection?

问题描述

给定一个名称集合，可能有10个字符或更长的名称，返回此名称，如果没有找到则返回null，如果有更多的b / b
则抛出异常。 />

Given a collection of names, there may be a name 10 characters or longer, return this name, or null if none is found,throw an exception if there is more
than 1.

public static string GetLongestName(IEnumerable<string> names) 
{ 
    throw new NotImplementedException(); 
}

我的尝试：



请推荐IDE或链接，因为我无法访问我的工作电脑。我曾尝试下载c＃IDE但无法正常工作。

What I have tried:

please recommend an IDE or a link, as I can't reach my work pc. I have tried to download c# IDE but did not work correctly.

推荐答案

IDE：Visual Studio。你可以为微软下载几个Express / Community版本 - 谷歌会为你找到它们。



然后：

IDE: Visual Studio. You can download several Express / Community versions for Microsoft - google will find them for you.

Then:

public static string GetLongestName(IEnumerable<string> names)
    {
    var all = names.Where(s => s.Length >= 10).OrderByDescending(s => s.Length);
    if (all.Count() <= 1) return all.FirstOrDefault();
    throw new ApplicationException("Too many strings match the criteria");
    }

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