PrintPreview ok в первый раз, но пустой второй раз

Question

Я тестировал кнопку «Предварительный просмотр», и она отлично работала. Закрыв окно PrintPreview, я снова нажал кнопку «Предварительный просмотр», и на этот раз она показала пустую страницу! Я не могу понять, почему это происходит. Вы искали этот сайт и многие другие, поэтому я отправляю этот вопрос. Любые идеи очень приветствуются.

Вот соответствующий код:

private void buttonPrintPreview_Click(object sender, EventArgs e) 
    { 
     page = 0; 

     printPreviewDialog1.Document = printDocument1; 
     printPreviewDialog1.ShowDialog(); 
    } 


    private void buttonPrint_Click(object sender, EventArgs e) 
    { 
     page = 0; 

     printDialog1.Document = printDocument1; 
     if (printDialog1.ShowDialog() == DialogResult.OK) 
     { 
      printDocument1.PrintPage += new PrintPageEventHandler(printDocument1_PrintPage); 
      printDocument1.DefaultPageSettings.Landscape = false; 
      printDocument1.Print(); 
      //printDocument1.Dispose(); 
     } 
    } 



    private void printDocument1_PrintPage(object sender, PrintPageEventArgs e) 
    { 
     Graphics g = e.Graphics; 

     //define margins 
     float leftMargin = 70.0f; //good room for hole punches! 
     float topMargin = 20.0f; 
     float lineInc = 20.0f; 
     //-------------------------------------------- 

     string eiNum = string.Empty; 
     string eiDesc = string.Empty; 
     string partNum = string.Empty; 
     string partDesc = string.Empty; 
     string price = string.Empty; 
     string partType = string.Empty; 
     string partQty = string.Empty; 
     string thisEndItem = string.Empty; 

     string textToPrint = string.Empty; 

     Font printFontArial10 = new Font("Arial", 10, FontStyle.Regular); 
     Font printFontArial10Bold = new Font("Arial", 10, FontStyle.Bold); 
     Font printFontArial14 = new Font("Arial", 14, FontStyle.Bold); 
     Font printFontCour8 = new Font("Courier New", 8, FontStyle.Regular); 

     if (page == 0 && counter == 0) 
     { 
      // draw image/logo 
      Image Logo = Image.FromFile(Settings.Default.LogoPath); 
      g.DrawImage(Logo, leftMargin, 35f); 

      // draw title 
      textToPrint = "TIW Purchasing - Master Buy List"; 
      e.Graphics.DrawString(textToPrint, printFontArial14, Brushes.Black, leftMargin + 160f, 54f); 

      // date 
      DateTime thisDay = DateTime.Today; 
      textToPrint = thisDay.ToString("d"); 
      e.Graphics.DrawString(textToPrint, printFontArial10, Brushes.Black, leftMargin + 280f, 76f); 

      eiNum = listView1.Items[0].Text; 
      eiDesc = listView1.Items[0].SubItems[1].Text; 

      if (eiDesc.Length > 80) 
       eiDesc = eiDesc.Substring(0, 80) + "..."; 

      textToPrint = eiNum + " - " + eiDesc; 
      e.Graphics.DrawString(textToPrint, printFontArial10Bold, Brushes.Black, leftMargin, topMargin + 90); 
     } 
     else if (page > 0) 
     { 
      double remainder = counter % amtperpage; 
      if (remainder == 0) //---means we're at the top of the page 
      { 
       //title & version 
       textToPrint = "TIW Purchasing - Master Buy List"; 
       e.Graphics.DrawString(textToPrint, printFontArial10Bold, Brushes.Black, leftMargin + 120, 54f); 
       textToPrint = "(continued from page " + page + ")"; 
       e.Graphics.DrawString(textToPrint, printFontArial10, Brushes.Black, leftMargin + 400, 54f); 
      } 
     } 

     if (page == 0) 
      lineInc = 90; 
     else 
      lineInc = 78; 

     int stop = counter + amtperpage; 

     if (stop > listView1.Items.Count) 
      stop = listView1.Items.Count; 

     while (counter < stop) 
     { 
      thisEndItem = listView1.Items[counter].SubItems[0].Text; 

      partNum = listView1.Items[counter].SubItems[2].Text; 
      partDesc = listView1.Items[counter].SubItems[3].Text; 
      price = listView1.Items[counter].SubItems[4].Text; 
      partType = listView1.Items[counter].SubItems[5].Text; 
      partQty = listView1.Items[counter].SubItems[6].Text; 

      if (thisEndItem == eiNum) //---still working on the same end item 
      { 
       lineInc += 12; 

       textToPrint = partNum; 
       e.Graphics.DrawString(textToPrint, printFontArial10, Brushes.Black, leftMargin + 10, topMargin + lineInc); 

       if (partDesc.Length > 70) 
        partDesc = partDesc.Substring(0, 70) + "..."; 
       textToPrint = partDesc; 
       e.Graphics.DrawString(textToPrint, printFontArial10, Brushes.Black, leftMargin + 70, topMargin + lineInc); 

       textToPrint = price; 
       e.Graphics.DrawString(textToPrint, printFontArial10, Brushes.Black, leftMargin + 600, topMargin + lineInc); 

       textToPrint = partType; 
       e.Graphics.DrawString(textToPrint, printFontArial10, Brushes.Black, leftMargin + 630, topMargin + lineInc); 

       textToPrint = partQty; 
       e.Graphics.DrawString(textToPrint, printFontArial10, Brushes.Black, leftMargin + 670, topMargin + lineInc); 
      } 
      else //---starting a new end item 
      { 
       lineInc += 16; 

       eiNum = listView1.Items[counter].Text; 
       eiDesc = listView1.Items[counter].SubItems[1].Text; 

       if (eiDesc.Length > 80) 
        eiDesc = eiDesc.Substring(0, 80) + "..."; 

       textToPrint = eiNum + " - " + eiDesc; 
       e.Graphics.DrawString(textToPrint, printFontArial10Bold, Brushes.Black, leftMargin, topMargin + lineInc); 
      } 

      counter++; 
     } 

     //---footer------------------------------- 
     DateTime dateTime = DateTime.Now; 
     textToPrint = "eView " + EViewMethods.eviewVersion + "      " + Environment.UserName + "      " + String.Format("{0:F}", dateTime); 
     e.Graphics.DrawString(textToPrint, printFontCour8, Brushes.Black, leftMargin, 1060f); 

     printpagenum = page + 1; 
     textToPrint = printpagenum.ToString(); 
     e.Graphics.DrawString(textToPrint, printFontArial10Bold, Brushes.Black, leftMargin + 740, 1060f); 
     //---------------------------------------- 

     page++; 
     e.HasMorePages = counter < listView1.Items.Count; 
    } 

Вот исправленный код:

private void buttonPrintPreview_Click(object sender, EventArgs e) 
    { 
     page = 0; 
     counter = 0; 

     printPreviewDialog1.Document = printDocument1; 
     printPreviewDialog1.ShowDialog(); 
    } 


    private void buttonPrint_Click(object sender, EventArgs e) 
    { 
     page = 0; 
     counter = 0; 

     printDialog1.Document = printDocument1; 
     if (printDialog1.ShowDialog() == DialogResult.OK) 
     { 
      printDocument1.PrintPage += new PrintPageEventHandler(printDocument1_PrintPage); 
      printDocument1.DefaultPageSettings.Landscape = false; 
      printDocument1.Print(); 
      //printDocument1.Dispose(); 
     } 
    } 

Answer 1

public Form1() 
{ 
    InitializeComponent(); 
    printDocument1.PrintPage += new PrintPageEventHandler(printDocument1_PrintPage); 
}