C#中如何对当前窗体进行打印预览-.NET教程,C#语言

[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();

}