Question

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.

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;
    }

Following this advice of this thread 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.

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.

Answer 1

Change your entire event to this

    void printDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
    {
        System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(printData.Width, printData.Height);
        printData.DrawToBitmap(bitmap, new System.Drawing.Rectangle(new Point(0, 0), printData.Size));
        e.Graphics.DrawImage(bitmap, e.MarginBounds.Location);
    }

Edit

This is my whole Project. I created a panel named printData and I added two buttons, I attached an event to button1.

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
    PrintDocument printDocument = new PrintDocument();
    public Form1()
    {
        InitializeComponent();
        pd.PrintPage += new PrintPageEventHandler(pd_PrintPage);
    }

    void printDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
    {
        System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(printData.Width, printData.Height);
        printData.DrawToBitmap(bitmap, new System.Drawing.Rectangle(new Point(0, 0), printData.Size));
        e.Graphics.DrawImage(bitmap, e.MarginBounds.Location);
    }


    private void button1_Click(object sender, EventArgs e)
    {
        pd.Print();
    }
}
}

You have to try this and see if it works, or else I wont be able to sleep tonight!!