C# 绘制ComboBox控件图片列表

using System;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Text.RegularExpressions;
using System.Windows.Forms;

namespace WinFormDrawImage
{
    public partial class FormDrawImage : Form
    {
        private ComboBox cmbImage;
        private PictureBox picture;
        private OpenFileDialog openFile;

        public FormDrawImage()
        {
            InitializeComponent();
            cmbImage = new ComboBox();
            cmbImage.Font = new Font(Font.Name, 24F);
            cmbImage.Dock = DockStyle.Top;
            cmbImage.DropDownStyle = ComboBoxStyle.DropDownList;
            cmbImage.DrawMode = DrawMode.OwnerDrawFixed;
            cmbImage.DrawItem += new DrawItemEventHandler(cmbImage_DrawItem);
            cmbImage.SelectedIndexChanged += new EventHandler(cmbImage_SelectedIndexChanged);
            this.Controls.Add(cmbImage);
            picture = new PictureBox();
            picture.Dock = DockStyle.Fill;
            picture.SizeMode = PictureBoxSizeMode.Zoom; // 图像大小按其原有的大小比例被增加或减小。
            this.Controls.Add(picture);