c#构造ColorComboBox(颜色下拉框)

            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);
                }
            }
        }
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