如何确定集合中最早/最新的DateTime？ [英] How to determine the earliest/latest DateTime in a collection?

问题描述

问题1：在DateTime对象的集合中，如何确定哪个对象是最早/最新的？

Question 1: In a collection of DateTime objects, how to determine which one is the earliest/latest?

问题2：在对象集合中，如何确定哪个对象具有最早/最新的DateTime属性？

Question 2: In a collection of objects, how to determine which object has the earliest/latest DateTime property?

例如：

class VideoGame
{
    DateTime ReleaseDate { get; set; }
}

视频游戏会首先发布/最后发布？

Which VideoGame will be released first/last?

var allGames = new List<VideoGame>();
allGames.Add( new VideoGame() { ReleaseDate = new DateTime(2010, 10, 4)} );
allGames.Add( new VideoGame() { ReleaseDate = new DateTime(2012, 7, 14)} );
allGames.Add( new VideoGame() { ReleaseDate = new DateTime(2014, 5, 26)} );

推荐答案

使用LINQ的OrderBy和OrderByDescending函数：

Use the OrderBy and OrderByDescending functions of LINQ:

VideoGame first= allGames.OrderBy(x => x.ReleaseDate).FirstOrDefault();
VideoGame last = allGames.OrderByDescending(x => x.ReleaseDate).FirstOrDefault();

• 如果allGames的商品为零，则first和last将为null。


• 如果allGames有1个项目，则两个项目都将引用同一项目



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