Question

If I have a richTextBox and run DrawToBitmap on it, it doesn’t draw any of the text inside of the richTextBox.

Bitmap b = new Bitmap(rtb.Width, rtb.Height);
inputControl.DrawToBitmap(b, new Rectangle(0, 0, b.Width, b.Height));

Is there any way to fix this?

Answer 1

This thread came up second in Google. Seems to have exactly what you want. Because I imagine you’re using this inside your function from this question Accepting Form Elements As Method Arguments?, it’s probably best to do something like this.

if(inputControl is RichTextBox)
{
    //do specifc magic here
}
else
{
    //general case
}

You can check for a Control containing RichTextBox recursively

bool ContainsOrIsRichTextBox(Control inputControl)
{
    if(inputControl is RichTextBox) return true;
    foreach(Control control in inputControl.Controls)
    {
        if(ContainsOrIsRichTextBox(control)) return true;
    }
    return false;
}

I haven’t compiled this, and there’s a way of doing it without risking a StackOverflowException, but this should get you started.