1.在界面中添加一个combox

2.将数据绑定到combox

 List<GrindingType> type = new List<GrindingType>();
 type.Add(new GrindingType { Id = 1, Name = "Product A", Type = new List<string> { "1", "2" } });
 type.Add(new GrindingType { Id = 2, Name = "Product 2", Type = new List<string> { "1", "2" } });
 type.Add(new GrindingType { Id = 3, Name = "Product 3", Type = new List<string> { "1", "2" } });
 type.Add(new GrindingType { Id = 4, Name = "自定义",Type=null});

 comboBox1.DataSource = type; // 使用DataSource属性加载数据，
 comboBox1.DisplayMember = "Name"; // 设置显示成员为Name属性。
 comboBox1.ValueMember = "Id"; // 设置值成员为Id属性。

3.为combox添加列表变动事件

4.获取列表点击列数据

//获取comboBox的DisplayMember值
Console.WriteLine("DisplayMember：" + comboBox1.Text);
//获取comboBox的ValueMember值
Console.WriteLine("ValueMember：" + comboBox1.SelectedValue.ToString());
//获取combox上绑定数据
GrindingType grindingType = (GrindingType)comboBox1.SelectedItem;
Console.WriteLine("选中值：" + grindingType.Id + "..." + grindingType.Name);

5.完整实现

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public class GrindingType
        {
            public int Id { get; set; }
            public string Name { get; set; }
            public List<string> Type { get; set; }
        }
        public Form1()
        {
            InitializeComponent();
            LoadComboBoxData();
        }

        private void LoadComboBoxData()
        {
            List<GrindingType> type = new List<GrindingType>();
            type.Add(new GrindingType { Id = 1, Name = "Product A", Type = new List<string> { "1", "2" } });
            type.Add(new GrindingType { Id = 2, Name = "Product 2", Type = new List<string> { "1", "2" } });
            type.Add(new GrindingType { Id = 3, Name = "Product 3", Type = new List<string> { "1", "2" } });
            type.Add(new GrindingType { Id = 4, Name = "自定义", Type = null });

            comboBox1.DataSource = type; // 使用DataSource属性加载数据，
            comboBox1.DisplayMember = "Name"; // 设置显示成员为Name属性。
            comboBox1.ValueMember = "Id"; // 设置值成员为Id属性。
        }

        private void comboBox1_SelectedValueChanged(object sender, EventArgs e)
        {
            Console.WriteLine("===================SelectedValueChanged=======================");

            //获取comboBox的DisplayMember值
            Console.WriteLine("DisplayMember：" + comboBox1.Text);
            //获取comboBox的ValueMember值
            Console.WriteLine("ValueMember：" + comboBox1.SelectedValue.ToString());
            //获取combox上绑定数据
            GrindingType grindingType = (GrindingType)comboBox1.SelectedItem;
            Console.WriteLine("选中值：" + grindingType.Id + "..." + grindingType.Name);

        }
    }
}