C#实现集合自定义排序的三种方式

using System;
using System.Collections.Generic;

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public class PersonComparer : IComparer<Person>
{
    public int Compare(Person x, Person y)
    {
        // 按年龄升序排序
        return x.Age.CompareTo(y.Age);
        
        // 如果想按名字排序，可以这样做：
        // return x.Name.CompareTo(y.Name);
        
        // 或者，可以实现更复杂的排序逻辑
    }
}

class Program
{
    static void Main()
    {
        List<Person> people = new List<Person>
        {
            new Person { Name = "Alice", Age = 30 },
            new Person { Name = "Bob", Age = 25 },
            new Person { Name = "Charlie", Age = 35 }
        };

        people.Sort(new PersonComparer());

        foreach (var person in people)
        {
            Console.WriteLine($"{person.Name}, {person.Age}");
        }
    }
}

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        var people = new List<Person>
        {
            new Person { Name = "Alice", Age = 30 },
            new Person { Name = "Bob", Age = 25 },
            new Person { Name = "Charlie", Age = 35 }
        };

        var sortedPeople = people.OrderBy(p => p.Age).ToList();

        foreach (var person in sortedPeople)
        {
            Console.WriteLine($"{person.Name}, {person.Age}");
        }
    }
}

var sortedPeople = people.OrderBy(p => p.Age).ThenBy(p => p.Name).ToList();

public class Person : IComparable<Person>
{
    public string Name { get; set; }
    public int Age { get; set; }

    public int CompareTo(Person other)
    {
        if (other == null) return 1;
        return this.Age.CompareTo(other.Age);
    }
}

// 然后可以直接使用 Sort 方法，不需要传递比较器
people.Sort();