Why am I missing controls with bit-CodePudding

Simple problem.

I have a form to which I add a panel and put 1 label with some text. When I look at the saved image, all I see is the panel. I have tried all the solutions I could find. Code below. I get the panel saved but the text box doesn't appear. If I can get that to work, then I can do all that I need.

What am I doing wrong?

            int x = SystemInformation.WorkingArea.X;
            int y = SystemInformation.WorkingArea.Y;
            int width = printPanel.Width;
            int height = printPanel.Height;

            Rectangle bounds = new Rectangle(x, y, width, height);

            using (Bitmap flag = new Bitmap(width, height))
            {
                printPanel.DrawToBitmap(flag, bounds);

                if (Environment.UserName == "grimesr")
                {
                    string saveImage = Path.Combine(fileStore, "./p"   ".png");
                    flag.Save(saveImage);
                }
             }

CodePudding user response：

Really not sure where you're going wrong.

Here's a simple test:

private void button1_Click(object sender, EventArgs e)
{
    int width = printPanel.Width;
    int height = printPanel.Height;
    Rectangle bounds = new Rectangle(0, 0, width, height);
    Bitmap flag = new Bitmap(width, height);
    printPanel.DrawToBitmap(flag, bounds);
    pictureBox1.Image = flag;
}

It grabs the entire panel and puts the image into the picturebox to the right:

CodePudding user response：

Thanks for the hints, even if they weren't directly related. The print button helped me figure this out. The button code worked as desired. However, putting the same code where I had it wasn't working. I then noticed a InvalidOperation error was being rasied. So looking at more in detail led me to see what the real issue was.

I must admit I left out 1 tiny piece of information that was critical. I was trying to do this in a thread that was feeding my label printer. Of course, trying to used a UI panel control in the thread threw an Invalid Operation. I moved the code out and all is well now. Cross thread operations are sometimes subtle and difficult to think about how they fail.

Problem solved for me.