c# - 一个类的一个属性指的是同一个类。如何管理实例

Question

我的模块中有以下代码:

Class Studentdatabase
{
public List <student> studentslist;
public void UpdateStudentDetailsinlist();
}


Class student
{
public string name;
public int age;
public int marks;
public student friend;
}

我的模块用数据填充这个数据库，这个数据库将被另一个模块使用。

studentslist [0]
name - Trevor
age -12
marks - 33
friend - 
    name - Sam
    age - 12
    marks - 45

studentslist [1]
name - Warren
age -13
marks - 63
friend - 
    name - Sam
    age - 12
    marks - 45

studentslist [2]
name - Sam
age -12
marks - 45
friend - null

我的要求是，如果学生列表 [2] (Sam) 的标记更新为 48，则必须自动更新学生列表 [0] 和学生列表 [1] 中 Sam 的标记(也反向)。这如何在模块中实现？

Answer 1

您可以按如下方式使用。

class StudentContext
{
    public List<Student> Studentslist { get; set; }

    public void AddStudent(Student student)
    {
        if (null == Studentslist)
        {
            Studentslist = new List<Student>();
        }
        Studentslist.Add(student);
    }

    public void AddFriend(Student student,Student friendStudent)
    {
        Studentslist.Where(x => x.StudentId == student.StudentId).FirstOrDefault().Friend = friendStudent;
    }
}

class Student
{
    public int StudentId { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
    public int Marks { get; set; }
    public Student Friend { get; set; }
}

public class Test
{
    public static void Main()
    {
        Student student1 = new Student();
        student1.StudentId = 1;
        student1.Name = "A";
        student1.Marks = 100;

        Student student2 = new Student();
        student2.StudentId = 2;
        student2.Name = "AB";
        student2.Marks = 10;

        StudentContext studentContext = new StudentContext();
        studentContext.AddStudent(student1);
        studentContext.AddStudent(student2);
        studentContext.AddFriend(student1, student2);

        student1.Marks = 50;
        student2.Marks = 77;
    }
}