Question

I have richtextbox and preview dialog.
when I want to make a preview I want to see all the pages of the richtextbox but now I can see only the fist page many times.

please help me

char[] param = { '\n' };
string [] lines = {};

if (pd.PrinterSettings.PrintRange == PrintRange.Selection)
{
   lines = rtb.SelectedText.Split(param);
}
else
{
   lines = rtb.Text.Split(param);
}

int i = 0;
char[] trimParam = { '\r' };
foreach (string s in lines)
{
   lines[i++] = s.TrimEnd(trimParam);
}
int linesPrinted = 0;
int x = e.MarginBounds.Left;
int y = e.MarginBounds.Top;
Brush brush = new SolidBrush(rtb.ForeColor);

while (linesPrinted < lines.Length)
{
   e.Graphics.DrawString(lines[linesPrinted++],
        rtb.Font, brush, x, y);
   y += 15;
   if (y >= e.MarginBounds.Bottom)
   {
       e.HasMorePages = true;
       return;
   }
   else
   {

       e.HasMorePages = false;
   }
}

Answer 1

Because if you have this method in the print page even, every time that a new page is printed you read again the content of the RichTextBox :

lines = rtb.Text.Split(param);

And you start again from the beginning …

So you have to read the RichTextBox content only in the first page …
To resolve this problem you can for example declare a variable outside of the method :

private int printPage = 0 ;

And externalize from the method the variables :

string [] lines = {};
int linesPrinted = 0;

The new code become (I haven’t tested it – is only a proof of concept) :

 if(printPage <= 0) {
   //First Page
   char[] param = { '\n' };
   linesPrinted = 0;
   if (pd.PrinterSettings.PrintRange == PrintRange.Selection)
   {
       lines = rtb.SelectedText.Split(param);
   }
   else
   {
       lines = rtb.Text.Split(param);
   }
  }
   int i = 0;
   char[] trimParam = { '\r' };
   foreach (string s in lines)
   {
       lines[i++] = s.TrimEnd(trimParam);
   }

   int x = e.MarginBounds.Left;
   int y = e.MarginBounds.Top;
   Brush brush = new SolidBrush(rtb.ForeColor);

   while (linesPrinted < lines.Length)
   {
       e.Graphics.DrawString(lines[linesPrinted++],
            rtb.Font, brush, x, y);
       y += 15;
       if (y >= e.MarginBounds.Bottom)
       {
           e.HasMorePages = true;
           printPage++;
           return;
       }
       else
       {
           e.HasMorePages = false;
       }
   }