Onpaint()和paint事件的问题

[netfox2003]

为什么重写Onpaint方法没有激发paint事件呢?

protected override void OnPaint(PaintEventArgs e)
{

base.OnPaint(e);
//Form1_Paint(e, e);
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
base.OnPaint(e);
Graphics g = e.Graphics;
g.DrawImage(m_Bitmap, new Rectangle(this.AutoScrollPosition.X, this.AutoScrollPosition.Y,(int)(m_Bitmap.Width), (int)(m_Bitmap.Height)));
}

[minioreo]

private void Form1_Paint(object sender, PaintEventArgs e) 
        { 
            base.OnPaint(e); 
            Graphics g = e.Graphics; 
            g.DrawImage(m_Bitmap, new Rectangle(this.AutoScrollPosition.X, this.AutoScrollPosition.Y,(int)(m_Bitmap.Width), (int)(m_Bitmap.Height))); 
        }

这个方法里为何要调用base.OnPaint(e) 岂不是把所有事件又执行一遍 会出问题的吧

[netfox2003]

没这句的base.OnPaint(e); 但问题还末解决,补充说明一下,在前面我已用了this.Invalidate();
private void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
g.DrawImage(m_Bitmap, new Rectangle(this.AutoScrollPosition.X, this.AutoScrollPosition.Y,(int)(m_Bitmap.Width), (int)(m_Bitmap.Height)));
}

[minioreo]

给出完整代码吧

[minioreo]

namespace TestOnPaint
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.Paint += new PaintEventHandler(Form1_Paint);
        }

        void Form1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.FillRectangle(Brushes.Chocolate, ClientRectangle);
        }
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
        }
    }
}

[netfox2003]

OK,行了,谢了