C# 四种图形填充效果

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private void button1_Click(object sender, EventArgs e)       {           Graphics gr =  CreateGraphics();           Image bmp = new Bitmap(1024,800);           Bitmap png = new Bitmap(@"D:\www.png");           Pen pen = new Pen(Color.Black, 2);           Brush br1 = new SolidBrush(Color.Red);           gr = Graphics.FromImage(bmp);           Brush br2 = new TextureBrush(png);           Brush br3 = new LinearGradientBrush(new Point(100,0),new Point(300,0),Color.Red,Color.Blue);           Brush br4 = new HatchBrush(HatchStyle.ForwardDiagonal,Color.Red,Color.White);                       gr.DrawEllipse(pen, 100, 100, 200, 200);//画圆轮廓           gr.FillEllipse(br1, 100, 100, 200, 200);//纯色填充             gr.DrawEllipse(pen, 300, 100, 200, 200);//画圆轮廓           gr.FillEllipse(br2,300,100, 200, 200);//图片填充             gr.DrawEllipse(pen, 500, 100, 200, 200);//画圆轮廓           gr.FillEllipse(br3,500,100, 200, 200);//渐变填充             gr.DrawEllipse(pen, 700, 100, 200, 200);//画圆轮廓           gr.FillEllipse(br4, 700, 100, 200, 200);//网状填充           pictureBox1.Image = bmp;//在PictureBox中显示结果           //释放资源           gr.Dispose();           br1.Dispose();           br2.Dispose();           br3.Dispose();           br4.Dispose();           pen.Dispose();       }

　　运行结果：

pictureBox控件显示输出结果，遮挡或最小窗口不会影响显示效果