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private void Frm_Resize_1(object sender, System.EventArgs e)
{
//怎么在这里清除画的线
}
private void Frm_Resize(object sender, System.EventArgs e)
{
}
private void pl_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
e.Graphics.DrawLine(new Pen(Color.Black,5 ), new Point(),new Point());
}