C#集合排序的三种方法（List＜T＞.Sort、LINQ 的 OrderBy、IComparable＜T＞ 接口）

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1、使用 List<T>.Sort 方法与自定义比较器

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);        // 或更复杂的排序逻辑    }}class Program{
  
      static void Main()    {
  
          List<Person> people = new List<Person>        {
  
              new Person { Name = "A", Age = 15 },            new Person { Name = "B", Age = 25 },            new Person { Name = "C", Age = 35 }        };        people.Sort(new PersonComparer());        foreach (var person in people)        {
  
              Console.WriteLine($"{person.Name}, {person.Age}");        }    }}

2、使用 LINQ 的 OrderBy 方法与自定义键选择器

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();
//var sortedPeople = people.OrderBy(p => p.Age).ThenBy(p => p.Name).ToList();        foreach (var person in sortedPeople)        {
  
              Console.WriteLine($"{person.Name}, {person.Age}");        }

3、默认的排序顺序

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();

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