为什么重写ToString()时,当项目添加到ComboBox时,不返回我想要的内容？

Question

public partial class TestConrol : UserControl
{
    public TestConrol()
    {
        InitializeComponent();
    }

    public override string ToString()
    {
        return "asd";
    }
}

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

    private void Form1_Load(object sender, EventArgs e)
    {
        TestConrol tc1 = new TestConrol();
        comboBox1.Items.Add(tc1);

        TestConrol tc2 = new TestConrol();
        comboBox1.Items.Add(tc2);
    }
}

当表单加载时,我看到combobox有两个空名称的项目,而不是"asd":/
但如果我在公共类中重写ToString(),而不是从任何东西派生,这个工作:

public class TestClass
{
    public override string ToString()
    {
        return "bla bla bla";
    }
}

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

    private void Form1_Load(object sender, EventArgs e)
    {
        TestClass tcl = new TestClass();
        comboBox1.Items.Add(tcl);
    }
}

之后我在组合框中看到"bla bla bla"

Answer 1

在您控制中创建一个属性并将组合框的DisplayMember映射到该属性,它应该可以工作.