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   源码介绍

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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;
using System.Drawing.Drawing2D;

namespace ComboBox_Draw
{
    public partial class Form1 : Form
    {
        public Form1()
        {// 5 1 a s p x
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //添加项
            comboBox1.Items.Add(new MyItem("000000", Image.FromFile(Application.StartupPath   "\\0.gif")));
            comboBox1.Items.Add(new MyItem("111111", Image.FromFile(Application.StartupPath   "\\1.gif")));
            comboBox1.Items.Add(new MyItem("222222", Image.FromFile(Application.StartupPath   "\\2.gif")));
            comboBox1.Items.Add(new MyItem("333333", Image.FromFile(Application.StartupPath   "\\3.gif")));

            //默认选中项索引
            comboBox1.SelectedIndex = 0;

            //自绘组合框需要设置的一些属性
            comboBox1.DrawMode = DrawMode.OwnerDrawFixed;
            comboBox1.DropDownStyle = ComboBoxStyle.DropDownList;
            comboBox1.ItemHeight = 50;
            comboBox1.Width = 200;

            //添加DrawItem事件处理函数
            comboBox1.DrawItem  = ComboBox1_DrawItem;

        }


        private void ComboBox1_DrawItem(object sender, DrawItemEventArgs e)
        {
            //鼠标选中在这个项上
            if ((e.State & DrawItemState.Selected) != 0)
            {
                //渐变画刷
                LinearGradientBrush brush = new LinearGradientBrush(e.Bounds, Color.FromArgb(255, 251, 237),
                                                 Color.FromArgb(255, 236, 181), LinearGradientMode.Vertical);
                //填充区域
                Rectangle borderRect = new Rectangle(3, e.Bounds.Y, e.Bounds.Width - 5, e.Bounds.Height - 2);

                e.Graphics.FillRectangle(brush, borderRect);

                //画边框
                Pen pen = new Pen(Color.FromArgb(229, 195, 101));
                e.Graphics.DrawRectangle(pen, borderRect);
            }
            else
            {
                SolidBrush brush = new SolidBrush(Color.FromArgb(255, 255, 255));
                e.Graphics.FillRectangle(brush, e.Bounds);
            }

            //获得项图片,绘制图片
            MyItem item = (MyItem)comboBox1.Items[e.Index];
            Image img = item.Img;
           
            //图片绘制的区域
            Rectangle imgRect = new Rectangle(6, e.Bounds.Y   3, 45,45);
            e.Graphics.DrawImage(img, imgRect);
            
            //文本内容显示区域
            Rectangle textRect =
                    new Rectangle(imgRect.Right   2, imgRect.Y, e.Bounds.Width - imgRect.Width, e.Bounds.Height - 2);
            
            //获得项文本内容,绘制文本
            String itemText = comboBox1.Items[e.Index].ToString();

            //文本格式垂直居中
            StringFormat strFormat = new StringFormat();
            strFormat.LineAlignment = StringAlignment.Center;
            e.Graphics.DrawString(itemText, new Font("微软雅黑", 12), Brushes.Black, textRect, strFormat);
        }



    }//_5_1_a_s_p_x
}