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PODrawToBitmap on Panel is blank
 

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    <p>So I've written a class that has a stores some test results info and then a control that displays that info to the user. I want to put a print function on this class to draw the control at a full page size and print it. However it always comes out blank. The code see the panel as a control because it could be some other type of value. I figure there must be something simple I'm missing.</p> <pre><code>void printDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e) { System.Drawing.Size oldSize = printData.Size; printData.Size = new System.Drawing.Size(e.MarginBounds.Width, e.MarginBounds.Height); System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(printData.Size.Width, printData.Size.Height); InvertZOrderOfControls(printData.Controls); printData.DrawToBitmap(bitmap, new System.Drawing.Rectangle(0, 0, printData.Size.Width, printData.Size.Height)); InvertZOrderOfControls(printData.Controls); e.Graphics.DrawImage(bitmap, e.MarginBounds.Location); bitmap.Save(@"C:\Users\jdudley\Documents\File.bmp"); printData.Size = oldSize; } </code></pre> <p>Following this advice of <a href="http://www.daniweb.com/software-development/csharp/threads/298209/printing-panel-in-c-desktop-application" rel="nofollow">this thread</a> inverted the Z-Order of the controls but it didn't change anything. The save call was added for debugging. It looks like it's actually rendering the background color of the panel without any of the controls.</p> <p>Edit: This is in the context of printing but I have not issue with printing what so ever. My error is in creating the bitmap. The save line I added proves this because it creates a blank bitmap file.</p>
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    1. COHow are you calling this event. have you debugged to ensure it is being executed at all?
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    2. COInverting the Z-order doesn't make any sense. Possible mishaps are controls that are just on top of the panel but don't have the panel as their Parent, fumbling the painting of a custom control by not doing so in its Paint event or using a control that doesn't support DrawToBitmap, like RichTextBox or WebBrowser.
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    3. COYes I've debugged it. I've looked at the bitmap saved by it and it prints a blank page. The control displays properly when I add it to a form so I'm not sure how it could be related to controls not having there parent. There are no custom controls.
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