C# 自定义类排序

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1）声明一个类

/// <summary>/// 人物类/// </summary>public class Person{  public string Name;  public int Age;  public override string ToString()  {    return "Name: " + Name + " Age: " + Age;  }}

2）声明一个继承了接口IComparer的类

/// <summary>/// 比较人物类实例大小，实现接口IComparer/// </summary>public class PersonComparer : IComparer<Person>{  public int Compare(Person x, Person y)  {    if (x == null && y == null) return 0;    if (x == null) return -1;    if (y == null) return 1;    //TODO：Person类实例X与Y的比较规则    //按姓名由小到大排列，姓名相同的人年龄大的在前    {      int temp = string.Compare(x.Name, y.Name);      if (temp > 0) return -1;      else if (temp < 0) return 1;      if (x.Age > y.Age) return 1;      if (x.Age < y.Age) return -1;    }    return 0;  }}

3）Main函数，建立一个List，并使用刚建立的PersonComparer类中的规则对List进行排序

static void Main(string[] args){  List<Person> a = new List<Person>();  a.Add(new Person() { Name = "Tsybius", Age = 23 });  a.Add(new Person() { Name = "Galatea", Age = 21 });  a.Add(new Person() { Name = "Lucius", Age = 22 });  a.Add(new Person() { Name = "Septimus", Age = 22 });  a.Add(new Person() { Name = "Octavius", Age = 22 });  a.Add(new Person() { Name = "Lucius", Age = 24 });  //输出a中全部元素  Console.WriteLine("排序前");  foreach (var v in a)  {    Console.WriteLine(v.ToString());  }  Console.WriteLine("-");  //对a进行排序  a.Sort(new PersonComparer());  //输出a中全部元素  Console.WriteLine("排序后");  foreach (var v in a)  {    Console.WriteLine(v.ToString());  }  Console.WriteLine("-");  Console.ReadLine();}

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