PrintPreview在C＃Windows应用程序中显示结果时打印空白 [英] Printing Is Coming Blank while PrintPreview Shows The Result In C# Windows Application

问题描述

我有一个Windows应用程序，它在PrintPreview的2个页面中显示数据，但是当我在PrintPreview中单击打印图标按钮时它打印空白页？



下面是我的代码：

  //  打印文档的页面。 
  private   int  NextPageNum =  0 ; 
 
  //  事件'PrintPage'的结果 
 < span class =code-keyword> private   void  prnDocument_PrintPage（ object  sender，System。 Drawing.Printing.PrintPageEventArgs e）
 {
 
  float  pageWidth = e.PageSettings.PrintableArea.Width; 
  float  pageHeight = e.PageSettings.PrintableArea.Height; 
 
 leftMargin =（ int ）e.MarginBounds.Left; 
 rightMargin =（ int ）e.MarginBounds.Right; 
 topMargin =（ int ）e.MarginBounds.Top; 
 bottomMargin =（ int ）e.MarginBounds.Bottom; 
 InvoiceWidth =（ int ）e.MarginBounds.Width; 
 InvoiceHeight =（ int ）e.MarginBounds.Height; 
 
  switch （NextPageNum）
 {
  case   0 ：
 RectangleF rectF1 =  new  RectangleF（ 90 ， 45 ，pageWidth-85，pageHeight-35）; 
 Pen rectPen =  new  Pen（System.Drawing.Color.Black， 1 ）; 
 e.Graphics.DrawRectangle（rectPen，Rectangle.Round（rectF1））; 
 
 RectangleF rectF2 =  new  RectangleF（ 95 ， 230 ，pageWidth  -   95 ，pageHeight  -   225 ）; 
  //   Pen rectPen = new Pen（System.Drawing.Color.Black，2）;  
 e.Graphics.DrawRectangle（rectPen，Rectangle.Round（rectF2））; 
 
 SetInvoiceHead（e.Graphics）;  //  绘制发票头 
 SetOrderData（e.Graphics）;  //  绘制订单数据 
 SetInvoiceData（e.Graphics，e）;  //  提取发票数据 
  break ; 
  case   1 ：
 ImageShower（e.Graphics）; 
  break ; 
} 
  //  下次打印下一页。 
 NextPageNum + =  1 ; 
 
  //  如果我们尚未打印第2页，我们会有更多页面。 
 e.HasMorePages =（NextPageNum< 2）; 
} 

  private   void  prnDocument_BeginPrint（ object  sender，PrintEventArgs e）
 {
  / /  从第0页开始。 
 NextPageNum =  0 ; 
} 

  private   void  btnPreview_Click（ object  sender，EventArgs e）
 {
 
 NextPageNum =  0 ; 
 retriveData（）; 
 foreBrush = FontforeColor（）; 
 prnPreview.Document = prnDocument; 
（（Form）prnPreview）.WindowState = FormWindowState.Maximized; 
  //  显示100％预览 
 prnPreview.PrintPreviewControl.StartPage = < span class =code-digit> 0 ; 
 prnPreview.PrintPreviewControl.Zoom =  1 。 0 ; 
 prnPreview.PrintPreviewControl.Columns =  1 ; 
 prnPreview.ShowDialog（）; 
} 

  private   void  btnPrint_Click（ object  sender，EventArgs e）
 {
 
 尝试 
 {
 prnDocument.Print（）; 
} 
  catch （例外e）
 {
 MessageBox.Show（e.ToString（））; 
} 
} 

解决方案

我找到了它...我已在 end   中提及  prnDocument_PrintPage，然后它 打印数据    PrintPreview .. 
 // 如果我们没有更多页面，请重置 下一个时间我们 print 。 
  if （NextPageNum>  1 ）NextPageNum =  0 ; 

I have a Windows Application That Showsn Data in 2 Pages in PrintPreview, but It Is Printing Blank Pages When I Click The Print Icon Button In PrintPreview ?

Below Is My Code :

// Print the document's pages.
        private int NextPageNum = 0;

// Result of the Event 'PrintPage'
 private void prnDocument_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
               
            float pageWidth = e.PageSettings.PrintableArea.Width;
            float pageHeight = e.PageSettings.PrintableArea.Height;

            leftMargin = (int)e.MarginBounds.Left;
            rightMargin = (int)e.MarginBounds.Right;
            topMargin = (int)e.MarginBounds.Top;
            bottomMargin = (int)e.MarginBounds.Bottom;
            InvoiceWidth = (int)e.MarginBounds.Width;
            InvoiceHeight = (int)e.MarginBounds.Height;

            switch (NextPageNum)
            {
                case 0:
                    RectangleF rectF1 = new RectangleF(90, 45, pageWidth-85, pageHeight-35);
                    Pen rectPen = new Pen(System.Drawing.Color.Black, 1);
                    e.Graphics.DrawRectangle(rectPen, Rectangle.Round(rectF1));

                    RectangleF rectF2 = new RectangleF(95, 230, pageWidth - 95, pageHeight - 225);
                    //Pen rectPen = new Pen(System.Drawing.Color.Black, 2);
                    e.Graphics.DrawRectangle(rectPen, Rectangle.Round(rectF2));

                    SetInvoiceHead(e.Graphics); // Draw Invoice Head
                    SetOrderData(e.Graphics); // Draw Order Data
                    SetInvoiceData(e.Graphics, e); // Draw Invoice Data
                    break;
                case 1:
                    ImageShower(e.Graphics);
                    break;
            }
            // Next time print the next page.
            NextPageNum += 1;

            // We have more pages if we have not yet printed page 2.
            e.HasMorePages = (NextPageNum <2);
      }

private void prnDocument_BeginPrint(object sender, PrintEventArgs e)
        {
            // Start with page 0.
            NextPageNum = 0;
        }

private void btnPreview_Click(object sender, EventArgs e)
        {
           
            NextPageNum = 0;
            retriveData();
            foreBrush = FontforeColor();
            prnPreview.Document = prnDocument;
            ((Form)prnPreview).WindowState = FormWindowState.Maximized;
            // To Display 100% Preview
            prnPreview.PrintPreviewControl.StartPage = 0;
            prnPreview.PrintPreviewControl.Zoom = 1.0;
            prnPreview.PrintPreviewControl.Columns = 1;
            prnPreview.ShowDialog();
       }

private void btnPrint_Click(object sender, EventArgs e)
       {
          
           try
           {
               prnDocument.Print();
           }
           catch (Exception e)
           {
               MessageBox.Show(e.ToString());
           }
       }

解决方案

i had found it...i had mentioned as below at the end of prnDocument_PrintPage, then it is printing data as in PrintPreview..
// If we have no more pages, reset for the next time we print.
if (NextPageNum > 1) NextPageNum = 0;

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