c#构造ColorComboBox(颜色下拉框)

    class colorcombobox : combobox
    {
        /// <summary>
        /// 当前选中色
        /// </summary>
        public color selectedcolor
        {
            get { return color.fromname(this.text); }
        }
        /// <summary>
        /// 构造函数，构造颜色下拉列表
        /// </summary>
        public colorcombobox()
        {
            this.drawmode = drawmode.ownerdrawfixed;
            this.dropdownstyle = comboboxstyle.dropdownlist;
            this.itemheight = 25;

            propertyinfo[] propinfolist = typeof(color).getproperties(bindingflags.static | bindingflags.declaredonly | bindingflags.public);
            foreach (propertyinfo c in propinfolist)
            {
                this.items.add(c.name);
            }
            this.text = "black"; //设置默认色
        }

        protected override void ondrawitem(drawitemeventargs e)
        {
            rectangle rect = e.bounds;

            if (e.index >= 0)
            {
                string colorname = this.items[e.index].tostring();
                color c = color.fromname(colorname);
                using (brush b = new solidbrush(c)) //预留下拉项间距
                {
                    e.graphics.fillrectangle(b, rect.x, rect.y + 2, rect.width, rect.height - 4);
                }
            }
        }