C#画笔使用复合数组绘制单个矩形的方法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace WindowsApplication2
{
  public partial class Form11 : Form
  {
    public Form11()
    {
      InitializeComponent();
    }
    private void button1_Click(object sender, EventArgs e)
    {
      Pen pen3 = new Pen(Color.Blue, 20);
       pen3.CompoundArray = new float[] { 0.0f, 0.25f, 0.45f, 0.55f, 0.75f, 1.0f };
       Graphics g3 = this.CreateGraphics();
       g3.DrawRectangle(pen3, new Rectangle(50, 50, 300, 200));
    }
  }
}