Windows窗体数据绑定DisplayMember自定义类的子属性

public class Person
{
    public string Name { get; set; }
    public Address Address { get; set; }
}

public class Address
{
    public string City { get; set; }
}

private void Form1_Load(object sender, EventArgs e)
{
    var persons = new List<Person>
    {
        new Person { Name = "John", Address = new Address { City = "New York" } },
        new Person { Name = "Jane", Address = new Address { City = "Los Angeles" } }
    };

    comboBox1.DataSource = persons;
    comboBox1.DisplayMember = "Name";
    comboBox1.ValueMember = "Address.City";
    comboBox1.Format += ComboBox1_Format;
}

private void ComboBox1_Format(object sender, ListControlConvertEventArgs e)
{
    var person = (Person)e.ListItem;
    e.Value = $"{person.Name}, {person.Address.City}";
}