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//构造函数
public Form1()
{
InitializeComponent();
Panel panel = GetPanel();
this.Controls.Add(panel);
}
private Panel GetPanel()
{
Panel panel = new Panel();
panel.Location = new Point(10,10);
panel.Size = new Size(150, 150);
panel.Paint += new PaintEventHandler(panel_Paint);
return panel;
}
void panel_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
g.DrawEllipse(new Pen(Color.Red), new Rectangle(10, 10, 100, 100));
}