Question

I am having alot of trouble printing a string with the printdocument method.

I have a report of invalid entries in the form of a string. I build this string by concatenating entries to it while inside a forloop of the invalid entries. It looks like this

foreach(Error entry in ErrorEntries)
   reportString += entry.ToString();

Now I access this string from the printdocument method (it’s a singleton). The trouble is that the string has about 300 entries so does not fit onto one page.

Let’s say it prints the first 30 records. I am having trouble with the e.HasMorePages = true command as from what I understand, it reruns the rpintdocument1 method. If that’s the case, then the method will just print the reportstring from top to bottom again stopping at the 30th record.

Is there a way to delete the line I just printed from the reportSummary string so the next time the printdocument method runs, it’s not printing the same contents of the string (the beginning 30 records)?

Answer 1

What you can do is use a field in the class where your printdocument method lives to store how many records you’ve managed to print so far:

EDIT: Updated example code to match your situation

class YourClass {
  private int charactersPrinted = 0;

  ...

  private void printdocument(object sender, PrintPageEventArgs ev) {
    var charactersDoneThisPage = 
      this.PrintReportStringPart(reportString.Substring(charactersPrinted));

    charactersPrinted += charactersDoneThisPage; // Number of characters you managed to print this page

    if (charactersPrinted < reportString.Length) {
      ev.HasMorePages = true;
    } else {
      ev.HasMorePages = false;
    }
  }

  // Prints the string to the page
  // Returns the number of characters it was actually able to print
  private int PrintReportStringPart(string reportStringPart) {

    // Print the reportStringPart however you're already doing it
    //  filling the page
    return charactersDoneThisPage;
  }
}