C#comBox下拉显示图片

ComBox显示图像，结合ImageList的Draw方法：

combox属性设置：

 comboBox1.DropDownStyle = ComboBoxStyle.DropDownList;
 comboBox1.DrawMode = DrawMode.OwnerDrawFixed;

DrawItem方法中进行实现：

 private void comboBox1_DrawItem(object sender, DrawItemEventArgs e)
        {
            
            Graphics r = e.Graphics;
            Rectangle rec = e.Bounds;
            Size imageSize = imageList1.ImageSize;
            if (e.Index >=0)
            {   //设置文本的方式
                string s = comboBox1.Items[e.Index].ToString();
                StringFormat SF = new StringFormat();
                SF.Alignment = StringAlignment.Near;
                //如果当前项没有焦点、键盘加速键
                if (e.State == (DrawItemState.NoAccelerator | DrawItemState.NoFocusRect))
                {
                    imageList1.Draw(e.Graphics, rec.Left, rec.Top, e.Index);
                    e.Graphics.DrawString(s, new Font("宋体", 10, FontStyle.Bold), new SolidBrush(Color.Black), rec.Left + imageSize.Width, rec.Top);
                    e.DrawFocusRectangle();          //取得焦点时候的虚线框
                }
                else
                {
                    e.Graphics.FillRectangle(new SolidBrush(Color.White), rec);   //画条目背景
                    imageList1.Draw(e.Graphics, rec.Left, rec.Top, e.Index);
                    e.Graphics.DrawString(s, new Font("宋体", 10, FontStyle.Bold), new SolidBrush(Color.Black), rec.Left + imageSize.Width, rec.Top);
                    e.DrawFocusRectangle();
                }

            }
        }