例項描述：

現有某班學生的兩份成績，兩份成績中存在一些不一致的記錄。需藉助於程式設計方法找出這些不一致的記錄

例項程式碼：

using System;
using System.Collections.Generic;
using System.Linq;
namespace IntersectAndExceptExp
{
    class Program
    {
        static void Main(string[] args)
        {
            List<Student> studentList1 = newList<Student>() {
                
 
new Student(){StudentId=1,Score=64},
                new Student(){StudentId=2,Score=85},
                new Student(){StudentId=3,Score=78},
                new Student(){StudentId=4,Score=94},
                new Student(){StudentId=5,Score=90}
            };
            List<Student> studentList2 = newList<Student>() {
                
 
new Student(){StudentId=1,Score=64},
                new Student(){StudentId=2,Score=80},
                new Student(){StudentId=3,Score=78},
                new Student(){StudentId=4,Score=94},
                new Student(){StudentId=5,Score=95}
            };
            var both = studentList1.Intersect(studentList2,new
 
 StudentComparer());
            var diff1 =studentList1.Except(both, new StudentComparer());
            var diff2 =studentList2.Except(both, new StudentComparer());
            Console.WriteLine("-------------下面是兩份成績中不同的記錄--------------");
            Console.WriteLine("-------------第一份學生成績--------------");
            foreach (var s in diff1)
            {
                Console.WriteLine("StudentId:"+s.StudentId+";Score:"+s.Score);
            }
            Console.WriteLine("-------------第一份學生成績--------------");
            foreach (var s in diff2)
            {
                Console.WriteLine("StudentId:"+ s.StudentId + ";Score:" + s.Score);
            }
        }
    }
    public class Student
    {
        public int StudentId { get; set; }
        public int Score { get; set; }
    }
    public class StudentComparer : IEqualityComparer<Student>
    {
        public bool Equals(Student x, Studenty)
        {
            if (Object.ReferenceEquals(x, y)) returntrue;
            return x != null && y != null&& x.StudentId == y.StudentId && x.Score == y.Score;
        }
        public int GetHashCode(Student obj)
        {
            int hashStudentId =obj.StudentId.GetHashCode();
            int hashScore =obj.Score.GetHashCode();
            return hashStudentId ^ hashScore;
        }
    }
}

程式碼說明：

先使用Intersect方法生成兩份記錄的交集，該方法會使用傳入的比較器對值進行比較決定記錄是否相同。基於前步生成的交集，再使用Except方法找出兩份記錄中不一致的記錄，該方法同樣使用傳入的比較器對值進行比較決定記錄是否相同。