美化ComboBox下拉

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

namespace 美化combobox下拉控件
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.Load += new EventHandler(Form_Load);
            this.beautifulCombo.DrawMode = DrawMode.OwnerDrawVariable;//必须在这里设置模式，不然没有效果
            this.beautifulCombo.DrawItem+=new DrawItemEventHandler(beautifulCombo_DrawItem);
        }


        protected void Form_Load(object sender, EventArgs e)
        {
            beautifulCombo.Items.Add("白菜");
            beautifulCombo.Items.Add("萝卜");
            beautifulCombo.Items.Add("土豆");
            beautifulCombo.Items.Add("洋葱");
            beautifulCombo.Items.Add("南瓜");
            beautifulCombo.Items.Add("西瓜");
            beautifulCombo.SelectedIndex = 0;
        }

 
        private void beautifulCombo_DrawItem(object sender, DrawItemEventArgs e)
        {
            Graphics g = e.Graphics;
            Rectangle r = e.Bounds;
            Size imgsize = imageList1.ImageSize;
            FontDialog fd = new FontDialog();
            Font fs = fd.Font;
            if (e.Index >= 0)
            {
                string temp = (string)beautifulCombo.Items[e.Index];
                StringFormat sf = new StringFormat();
                sf.Alignment = StringAlignment.Near;
                if (e.State == (DrawItemState.NoAccelerator | DrawItemState.NoFocusRect))
                {
                    e.Graphics.FillRectangle(new SolidBrush(Color.Red), r);
                    imageList1.Draw(e.Graphics, r.Left, r.Top, e.Index);
                    e.Graphics.DrawString(temp, fs, new SolidBrush(Color.Black), r.Left + imgsize.Width,r.Top);
                    e.DrawFocusRectangle();
                }
                else
                {
                    e.Graphics.FillRectangle(new SolidBrush(Color.LightBlue), r);
                    imageList1.Draw(g, r.Left, r.Top, e.Index);
                    e.Graphics.DrawString(temp, fs, new SolidBrush(Color.Black), r.Left + imgsize.Width, r.Top);
                    e.DrawFocusRectangle();
                }
            }
        }
    }
}