如何让 LINQ 返回具有给定属性最大值的对象? [英] How can I get LINQ to return the object which has the max value for a given property?

问题描述

如果我有一个看起来像这样的类:

If I have a class that looks like:

public class Item
{
    public int ClientID { get; set; }
    public int ID { get; set; }
}

还有这些物品的集合...

And a collection of those items...

List<Item> items = getItems();

如何使用 LINQ 返回具有最高 ID 的单个Item"对象?

How can I use LINQ to return the single "Item" object which has the highest ID?

如果我这样做:

items.Select(i => i.ID).Max(); 

我只会得到最高的 ID，当我真正想要返回的是具有最高 ID 的 Item 对象本身时?我希望它返回一个Item"对象，而不是一个 int.

I'll only get the highest ID, when what I actually want returned is the Item object itself which has the highest ID? I want it to return a single "Item" object, not an int.

推荐答案

这只会循环一次.

Item biggest = items.Aggregate((i1,i2) => i1.ID > i2.ID ? i1 : i2);

谢谢尼克 - 这是证据

Thanks Nick - Here's the proof

class Program
{
    static void Main(string[] args)
    {
        IEnumerable<Item> items1 = new List<Item>()
        {
            new Item(){ ClientID = 1, ID = 1},
            new Item(){ ClientID = 2, ID = 2},
            new Item(){ ClientID = 3, ID = 3},
            new Item(){ ClientID = 4, ID = 4},
        };
        Item biggest1 = items1.Aggregate((i1, i2) => i1.ID > i2.ID ? i1 : i2);

        Console.WriteLine(biggest1.ID);
        Console.ReadKey();
    }


}

public class Item
{
    public int ClientID { get; set; }
    public int ID { get; set; }
}  

重新排列列表并得到相同的结果

Rearrange the list and get the same result

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