個人程式碼程式庫のC#背景色漸層的功能

        /// <summary>        /// 實現“背景色漸層”的功能。【尚不完善】        /// </summary>        /// <param name="e"></param>        protected override void OnPaintBackground(PaintEventArgs e)        {            int y, dy;            //y=this.Height-this.ClientRectangle.Height;            y = this.ClientRectangle.Location.Y;            dy = this.ClientRectangle.Height / 256;            for (int i = 255; i >= 0; i--)            {                              Color c = new Color();                c = Color.FromArgb(Convert.ToInt32(textBox1.Text.ToString()), i,Convert.ToInt32(textBox2.Text.ToString()));                SolidBrush sb = new SolidBrush(c);                Pen p = new Pen(sb, 100);                e.Graphics.DrawRectangle(p,this.ClientRectangle.X, y, this.Width,y+dy);                y = y + dy;            }        }