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实例描述
现有某班学生的两份成绩，两份成绩中存在一些不一致的记录。需借助于编程方法找出这些不一致的记录。
实例代码
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("-------------下面是两份成绩中不同的记录--------------");
Console.WriteLine("-------------第一份学生成绩--------------");
foreach (var s in diff1)
{
Console.WriteLine("StudentId:"+s.StudentId+";Score:"+s.Score);
}
Console.WriteLine("-------------第一份学生成绩--------------");
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;
}
}
}
</div>
代码说明
先使用Intersect方法生成两份记录的交集，该方法会使用传入的比较器对值进行比较决定记录是否相同。基于前步生成的交集，再使用Except方法找出两份记录中不一致的记录，该方法同样使用传入的比较器对值进行比较决定记录是否相同。
执行结果
