c# - 为什么 CheckedListBox DisplayMember 不显示？

Question

我正在尝试做一些非常简单的事情 - 将 CheckedListBox 绑定(bind)到对象列表。

Class definition

namespace Models
{
    public class Department
    {
        public int ID { get; set; }
        public string Description { get; set; }
    }
}

---

Minimal complete code sample to replicate the issue

(Create CheckedListBox clbDepartments first)

    private void Form1_Load(object sender, EventArgs e)
    {
        List<Department> departmentList = new List<Department>();
        departmentList.Add(new Department { ID = 1, Description = "HR" });
        departmentList.Add(new Department { ID = 2, Description = "IT" });
        departmentList.Add(new Department { ID = 3, Description = "Sales" });

        var departmentBindingList = new BindingList<Department>(departmentList);
        var departmentSource = new BindingSource(departmentBindingList, null);
        clbDepartments.DisplayMember = "Description";
        clbDepartments.ValueMember = "ID";
        clbDepartments.DataSource = departmentSource;
    }

列表绑定(bind) - 我可以在 CheckboxList 中看到一项List<Department> 中的每一项.

但不是显示 "Description" 的值字段，即 DisplayMember , 列表显示 "Models.Department"对于每个项目。

Expected Output

HR

IT

Sales

---

Actual Output

Models.Department

Models.Department

Models.Department

我做错了什么？

Answer 1

你应该改变顺序。
首先设置DataSource，然后设置DisplayMember和ValueMember

这应该有效:

clbDepartments.DataSource = departmentSource;
clbDepartments.DisplayMember = "Description";
clbDepartments.ValueMember = "ID";