IEqualityComparer<T>接口

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IEqualityComparer<T>接口的对象的主要作用在于自定义判断两个对象是否相等。

其中最常用的方法： bool Equals(T x, T y);

实现该方法用于比较两个对象是否相等。如果指定的对象相等，则为 true；否则为 false。

class Program    {        static void Main(string[] args)        {            People p1 = new People(1, "刘备", 23);            People p2 = new People(1, "关羽", 22);            People p3 = new People(1, "张飞", 21);            List<People> listP1 = new List<People>();            listP1.Add(p1);            listP1.Add(p2);            listP1.Add(p3);            People p4 = new People(2, "赵云", 23);            People p5 = new People(2, "黄忠", 22);            People p6 = new People(2, "马超", 21);            List<People> listP2 = new List<People>();            listP2.Add(p4);            listP2.Add(p5);            listP2.Add(p6);            Comparers c = new Comparers();            bool b = listP1.SequenceEqual(listP2, c);   //只要集合中的对象年龄相等就视对象为相等            Console.WriteLine(b);   //输出 True            Console.ReadKey();        }    }    public class Comparers : IEqualityComparer<People>    {        public bool Equals(People p1, People p2)        {            if (p1.Age == p2.Age)            {                return true;            }            return false;        }        public int GetHashCode(People obj)        {            throw new NotImplementedException();        }    }    public class People    {        public People(int id, string name, int age)        {            this.Id = id;            this.Name = name;            this.Age = age;        }        public int Id        {            get;            set;        }        public string Name        {            get;            set;        }        public int Age        {            get;            set;        }    }

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