Question

请考虑我不擅长英语。

Class'Clele'列表绑定到ListBox，Displaymemeber是'group'字段。

我的目标是显示该组没有重叠。（只是A和B）

但是我的代码显示如下。

我如何只显示A和B？

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        Student st1 = new Student("Kim", 15, Group.A);
        Student st2 = new Student("Lee", 15, Group.A);
        Student st3 = new Student("Park", 15, Group.B);

        Student.Add(st1);          
        Student.Add(st2);          
        Student.Add(st3);

        listBox1.DataSource = Student.LstStudent;
        listBox1.DisplayMember = "group";
    }
}


public enum Group
{
    None,
    A,
    B,
    C
}

public class Student
{
    private static List<Student> _LstStudent = new List<Student>();
    public static List<Student> LstStudent
    {
        get
        {
            return _LstStudent;
        }
    }

    public Group group { get; set; }
    public string name { get; set; }
    public int age { get; set; }


    public Student(string name, int age, Group group)
    {
        this.name = name;
        this.age = age;
        this.group = group;
    }

    public static void Add(Student student)
    {
        LstStudent.Add(student);
    }
}

Answer 1

如果您打算只显示群组，可以使用LINQ过滤List<Student>。

尝试更改

listBox1.DataSource = Student.LstStudent;
listBox1.DisplayMember = "group";

要

listBox1.DataSource = Student.LstStudent.Select(x => x.group).Distinct().ToArray();

如何查询具有相同值的类

1 个答案: