如何使用LINQ选择具有最高价值的商品? [英] How do I select the item with the highest value using LINQ?

问题描述

想象一下，您有一个像这样的课程:

Imagine you got a class like this:

class Foo {
    string key;
    int value;
}

您如何从IEnumeralbe<Foo>中选择具有最高值的Foo?

How would you select the Foo with the highest value from an IEnumeralbe<Foo>?

一个基本问题是使迭代次数保持较低(即为1)，但这会影响可读性.毕竟，我能找到的最好的方法是:

A basic problem is to keep the number of iterations low (i.e. at 1), but that affects readability. After all, the best I could find was something along the lines of this:

IEnumerable<Foo> list;
Foo max = list.Aggregate ((l, r) => l.value > r.value ? l : r);

您能想到一种更好的方法吗?

Can you think of a more better way?

list.OrderByDescending(l => l.value).First();是我的首选，但不是O(n).

list.OrderByDescending(l => l.value).First(); was my preferred option, but it is not O(n).

推荐答案

您可以获取 MoreLinq 中的cs"rel =" noreferrer> MaxBy LINQ扩展方法项目.那就是:

You can grab the MaxBy LINQ extension method from Jon Skeet's MoreLinq project. Then it's just:

Foo max = list.MaxBy(f => f.value);

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