在Visual Studio中创建Windows窗体程序，将Form调整到一定大小，并将背景色改为白色。

然后，右击Form，选择【查看代码】，在头部添加下面的命名空间：

using System.Drawing.Drawing2D;

在窗体的构造函数后添加如下代码：（构造函数即public Form1(){InitializeComponent();}后面）

protected override void OnPaint(PaintEventArgs e) { Graphics g = e.Graphics; //创建一个填充矩形 SolidBrush brush = new SolidBrush(Color.BlueViolet); g.FillRectangle(brush, 180, 70, 200, 150);

//创建一个位图，其中的两个矩形之间有透明效果 Bitmap bm1 = new Bitmap(200, 100); Graphics bg1 = Graphics.FromImage(bm1); SolidBrush redBrush = new SolidBrush(Color.FromArgb(210, 255, 0, 0)); SolidBrush greenBrush = new SolidBrush(Color.FromArgb(210, 0, 255, 0)); bg1.FillRectangle(redBrush, 0, 0, 150, 70); bg1.FillRectangle(greenBrush, 30, 30, 150, 70); g.DrawImage(bm1, 100, 50);

//创建第二个位图，其中两个矩形之间没有透明效果 Bitmap bm2 = new Bitmap(200, 100); Graphics bg2 = Graphics.FromImage(bm2); bg2.CompositingMode = CompositingMode.SourceCopy; bg2.FillRectangle(redBrush, 0, 0, 150, 70); bg2.FillRectangle(greenBrush, 30, 30, 150, 70); g.CompositingQuality = CompositingQuality.GammaCorrected;

//g.CompositingMode = CompositingMode.SourceCopy;

g.DrawImage(bm2, 300, 100); Bitmap bm3 = new Bitmap(200, 100); Graphics bg3 = Graphics.FromImage(bm3); redBrush = new SolidBrush(Color.FromArgb(100, 255, 0, 0)); greenBrush = new SolidBrush(Color.FromArgb(100, 0, 255, 0)); bg3.FillRectangle(redBrush, 0, 0, 150, 70); bg3.FillRectangle(greenBrush, 30, 30, 150, 70); g.DrawImage(bm3, 100, 150); }

演示效果如下：

注意：本文参考如下资料制作：

http://dev.firnow.com/course/3_program/cshapo/csharpjs/20100108/188423.html