C#中如何对当前窗体进行打印预览

核心提示：[System.Runtime.InteropServices.DllImport("gdi32.dll")]public static extern long BitBlt (IntPtr hdcDest, int nXDest, int nYDest, int nWidth, int nHeig

[System.Runtime.InteropServices.DllImport("gdi32.dll")]
public static extern long BitBlt (IntPtr hdcDest, int nXDest, int nYDest, int nWidth, int nHeight, IntPtr hdcSrc, int nXSrc, int nYSrc, int dwRop);
private Bitmap memoryImage;
private void CaptureScreen()
{
　 Graphics mygraphics = this.CreateGraphics();
　 Size s = this.Size;
　 memoryImage = new Bitmap(s.Width, s.Height, mygraphics);
　 Graphics memoryGraphics = Graphics.FromImage(memoryImage);
　 IntPtr dc1 = mygraphics.GetHdc();
　 IntPtr dc2 = memoryGraphics.GetHdc();
　 BitBlt(dc2, 0, 0, this.ClientRectangle.Width, this.ClientRectangle.Height, dc1, 0, 0, 13369376);
　 mygraphics.ReleaseHdc(dc1);
　 memoryGraphics.ReleaseHdc(dc2);
}
private void printDocument1_PrintPage(System.Object sender, System.Drawing.Printing.PrintPageEventArgs e)
{
　 e.Graphics.DrawImage(memoryImage, 0, 0);
}
private void printButton_Click(System.Object sender, System.EventArgs e)
{
　 CaptureScreen();
　 printPreviewDialog1.Show();
}