Winform ListView中使用combox填充单元格

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsAppTest
{
    public partial class ListViewxc : ListView
    {
        private List<Control> controlsxc = new List<Control>();
        private const int WM_PAINT = 0x000F;
        public ListViewxc()
        {
            InitializeComponent();

            controlsxc.Clear();

            this.OwnerDraw = true;
            this.DrawColumnHeader += new DrawListViewColumnHeaderEventHandler(this_DrawColumnHeader);
            this.DrawSubItem += new DrawListViewSubItemEventHandler(this_DrawSubItem);  
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            foreach (Control item in controlsxc)
            {
                ListViewSubItemxc subItemxc = item.Tag as ListViewSubItemxc;
                if (subItemxc != null)
                {
                    Rectangle r = subItemxc.Bounds;
                    ComboBox combox = item as ComboBox;
                    if (combox != null)
                    {
                        if (r.Y > 0 && r.Y < this.ClientRectangle.Height)
                        {
                            combox.Visible = true;
                            combox.Bounds = new Rectangle(r.X + 2, r.Y + 2, r.Width - (2 * 2), r.Height - (2 * 2));
                            System.Diagnostics.Debug.WriteLine(",,," + r.X + " " + r.Y + " " + r.Width + " " + r.Height);
                        }
                        else
                        {
                            combox.Visible = false;
                        }
                    }
                }
            }

            base.OnPaint(e);
        }

        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_PAINT)
            {
                foreach (Control item in controlsxc)
                {
                    ListViewSubItemxc subItemxc = item.Tag as ListViewSubItemxc;
                    if (subItemxc != null)
                    {
                        Rectangle r = subItemxc.Bounds;
                        ComboBox combox = item as ComboBox;
                        if (combox != null)
                        {
                            if (r.Y > 0 && r.Y < this.ClientRectangle.Height)
                            {
                                combox.Visible = true;
                                combox.Bounds = new Rectangle(r.X + 2, r.Y + 2, r.Width - (2 * 2), r.Height - (2 * 2));
                                System.Diagnostics.Debug.WriteLine(",,," + r.X + " " + r.Y + " " + r.Width + " " + r.Height);
                            }
                            else
                            {
                                combox.Visible = false;
                            }
                        }
                    }
                }
            }

            base.WndProc(ref m);
        }

        private void this_DrawSubItem(object sender, DrawListViewSubItemEventArgs e)
        {
            e.DrawDefault = true;
        }

        private void this_DrawColumnHeader(object sender, DrawListViewColumnHeaderEventArgs e)
        {
            e.DrawDefault = true;
        }

        public void AddItemxc(ListViewItem item)
        {
            foreach (ListViewItem.ListViewSubItem it in item.SubItems)
            {
                ListViewSubItemxc x = it as ListViewSubItemxc;
                if (x != null && x._control != null)
                {
                    this.Controls.Add(x._control);
                    x._control.Tag = x;

                    ComboBox co = x._control as ComboBox;
                    if (co != null)
                    {
                        co.SelectedIndexChanged += Co_SelectedIndexChanged;
                        controlsxc.Add(co);
                    }
                }
            }

            this.Items.Add(item);
        }

        private void Co_SelectedIndexChanged(object sender, EventArgs e)
        {
            ComboBox co = sender as ComboBox;
            ListViewSubItemxc x = co.Tag as ListViewSubItemxc;
            if (x != null)
            {
                x.Text = co.SelectedText;
            }
        }
    }

    public class ListViewSubItemxc : ListViewItem.ListViewSubItem
    {
        public Control _control = null;

        public ListViewSubItemxc(Control con)
        {
            _control = con;
        }
    }
}

　　

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

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

        private void Form1_Load(object sender, EventArgs e)
        {

            ListViewItem l = new ListViewItem();
            l.Text = "a";
            ComboBox cb = new ComboBox();
            cb.DropDownStyle = ComboBoxStyle.DropDownList;
            cb.Items.Add("yellow");
            cb.Items.Add("red");
            cb.SelectedIndex = 0;
            ListViewSubItemxc lxc = new ListViewSubItemxc(cb);

            ListViewItem l2 = new ListViewItem();
            ComboBox cb2 = new ComboBox();
            cb2.DropDownStyle = ComboBoxStyle.DropDownList;
            cb2.Items.Add("yellow2");
            cb2.Items.Add("red2");
            cb2.SelectedIndex = 1;
            ListViewSubItemxc lxc2 = new ListViewSubItemxc(cb2);

            l.SubItems.Add(lxc);
            l2.SubItems.Add(lxc2);
            listViewxc1.AddItemxc(l);
            listViewxc1.AddItemxc(l2);
        }
    }
}