c# - Save image of whole ListView -

i have next code:

private static void snapshotpng(listview source, string destination, int zoom) {     try     {         double actualheight = source.actualheight;         double actualwidth = source.actualwidth;          double renderheight = actualheight * zoom;         double renderwidth = actualwidth * zoom;          rendertargetbitmap rendertarget = new rendertargetbitmap((int)renderwidth, (int)renderheight, 96, 96, pixelformats.pbgra32);         visualbrush sourcebrush = new visualbrush(source);          drawingvisual drawingvisual = new drawingvisual();         drawingcontext drawingcontext = drawingvisual.renderopen();          using (drawingcontext)         {             drawingcontext.pushtransform(new scaletransform(zoom, zoom));             drawingcontext.drawrectangle(sourcebrush, null, new rect(new point(0, 0), new point(actualwidth, actualheight)));         }         rendertarget.render(drawingvisual);          pngbitmapencoder encoder = new pngbitmapencoder();         encoder.frames.add(bitmapframe.create(rendertarget));         using (filestream stream = new filestream(destination, filemode.create, fileaccess.write))         {             encoder.save(stream);         }     }     catch (exception e)     {         messagebox.show(e.message);     } } 

it saves given source image, works fine. save visible part of control (in case, visible items of listview). how can save snapshot of whole items in listview?

i've changed first 2 lines, adding arrange , measure methods, allow control render in memory. i've assumed, control doesn't scroll horizontally , kept width was, since otherwise use minimal width required largest child. can change it.

here method.

   private static void snapshotpng(listview source, string destination, int zoom)         {             try             {                 double actualwidth = source.actualwidth;                 source.measure(new size(source.actualwidth, double.positiveinfinity));                 source.arrange(new rect(0, 0, actualwidth, source.desiredsize.height));                 double actualheight = source.actualheight;                  double renderheight = actualheight * zoom;                 double renderwidth = actualwidth * zoom;                  rendertargetbitmap rendertarget = new rendertargetbitmap((int)renderwidth, (int)renderheight, 96, 96, pixelformats.pbgra32);                 visualbrush sourcebrush = new visualbrush(source);                  drawingvisual drawingvisual = new drawingvisual();                 drawingcontext drawingcontext = drawingvisual.renderopen();                  using (drawingcontext)                 {                     drawingcontext.pushtransform(new scaletransform(zoom, zoom));                     drawingcontext.drawrectangle(sourcebrush, null, new rect(new point(0, 0), new point(actualwidth, actualheight)));                 }                 rendertarget.render(drawingvisual);                  pngbitmapencoder encoder = new pngbitmapencoder();                 encoder.frames.add(bitmapframe.create(rendertarget));                 using (filestream stream = new filestream(destination, filemode.create, fileaccess.write))                 {                     encoder.save(stream);                 }             }             catch (exception e)             {                 messagebox.show(e.message);             }         }