c# - 无法获取面板 C# 的打印预览

Question

我希望我的程序只显示面板的打印预览，而不是显示整个纸张大小。如何设置这个的打印预览？

    Bitmap MemoryImage;
    public void GetPrintArea(Panel pnl)
    {
        MemoryImage = new Bitmap(pnl.Width, pnl.Height);
        Rectangle rect = new Rectangle(0, 0, pnl.Width, pnl.Height);
        pnl.DrawToBitmap(MemoryImage, new Rectangle(0, 0, pnl.Width, pnl.Height));
    }
    protected override void OnPaint(PaintEventArgs e)
    {
        if (MemoryImage != null)
        {
            e.Graphics.DrawImage(MemoryImage, 0, 0);
            base.OnPaint(e);
        }
    }
    public void printdoc1_PrintPage(object sender, PrintPageEventArgs e)
    {
        Rectangle pagearea = e.PageBounds;
        e.Graphics.DrawImage(MemoryImage, (pagearea.Width / 2) - (this.panel1.Width / 2), this.panel1.Location.Y);
    }
    public void Print(Panel pnl)
    {        
        //printDocument1 
        pannel = pnl;
        GetPrintArea(pnl);
        previewdlg.Document = printdoc1;
        previewdlg.ShowDialog();
    }

    private void btnPrintCheque_Click(object sender, EventArgs e)
    {
        Print(panel1); 
    }