C# List 排序各种用法与比较

Posted 2020-08-09 alun-chen

 

下面介绍各种List的sort的用法与比较

首先，我们建一个People的实体，有name、age、sex的属性，我们要排序的字段是年龄age

新建一个实体类

    public class People
    {
        public string name { get; set; }
        public int age { get; set; }
        public string sex { get; set; }
    }

新建list的数据

            List<People> peoples = new List<People>()
            {
                new People() {age = 11, name="alun", sex = "男"},
                new People() {age=25, name = "陈敬桃", sex = "男"},
                new People() {age=9, name = "惠安", sex = "男"},
                new People() {age = 45, name = "小票", sex = "女"},
                new People() {age=3, name = "晓鸥", sex = "女"},
                new People() {age=70, name = "望谟", sex = "男"}
            };

 

1. 第1种排序方法，使用 IComparer

    public class PeopleAgeComparer : IComparer<People>
    {
        public int Compare(People p1, People p2)
        {
            return p1.age.CompareTo(p2.age);
        }
    }

peoples.Sort(new PeopleAgeComparer());

可以看到第一种方法比价麻烦，要新建一个新的类来做

 

 

2. 第2种排序方法，使用委托来排序

peoples.Sort(delegate (People p1, People p2) { return p1.age.CompareTo(p2.age); });

看委托的方式很方便，不用新建类这么麻烦。

 

 

3. 第2种排序方法，使用Lambda表达式来排序

peoples.Sort( (a, b) => a.age.CompareTo(b.age) );

 

 

 

目测排序有这3种方法，个人觉得还是Lambda表达式使用得方便。