需要幫助從列表中打印多個頁面

Question

我在嘗試弄清c＃打印多個頁面時遇到困難。我的應用程序創建一個包含1到10個元素的對象類型列表。每個對象包含2個字符串屬性：docTypeNumber和docTypeDescription。一個名爲flightnumber的變量也被傳入類構造函數。每個實例都是一種文檔類型，必須打印爲單獨的條形碼錶，其中包含文檔類型編號，描述和航班號。大多數多頁打印示例都是將文檔「溢出」到多個頁面上，而不是由多個單獨頁面組成的頁面。我的問題是如何實現這一點。

我是否需要創建一個大文檔，並將其泄漏到多個頁面上？ 我是否必須創建PrintDocument類的多個實例？

任何幫助將不勝感激。

這裏是我的代碼：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Drawing; 
using System.Drawing.Printing; 
using System.Windows.Forms; 

namespace BarcodeTest 
{ 
    class BarcodePrinter 
    { 
     public BarcodePrinter(List<DocumentType> type, string flightnumber) 
     { 
      docType = type; 
      flightNumber = flightnumber; 
     } 

     //Attributes 
     private List<DocumentType> docType = new List<DocumentType>(); 
     private string flightNumber; 

     //helper variables 
     string docTypeNumber; 
     string docTypeDescription; 
     int pageNumber = 1; 
     int numberOfPages; 
     private static Font barcodeFont = new Font("3 of 9 Barcode", 24); 
     private static Font printFont = new Font("Arial", 24); 

     public void Print() 
     { 
      numberOfPages = docType.Count; 

      PrintDocument pd = new PrintDocument(); 

      foreach (DocumentType type in docType) 
      { 
       docTypeNumber = type.DocumentTypeNumber; 
       docTypeDescription = type.DocumentDescription; 

       pd.PrintPage += new PrintPageEventHandler(pd_PrintPage); 
      }//end foreach 

#if DEBUG 
      PrintPreviewDialog printPreview = new PrintPreviewDialog(); 
      printPreview.Document = pd; 
      printPreview.Show(); 
#else 
      pd.Print(); 
#endif 
     }// end Print() method 

     public void pd_PrintPage(Object sender, PrintPageEventArgs e) 
     { 
      Graphics g = e.Graphics; 
      //e.Graphics.PageUnit = GraphicsUnit.Point; 
      e.Graphics.PageUnit = GraphicsUnit.Inch; 

      StringFormat stringFormat = new StringFormat(); 
      stringFormat.Alignment = StringAlignment.Center; 
      stringFormat.LineAlignment = StringAlignment.Center; 

      Brush br = new SolidBrush(Color.Black); 
      RectangleF rec1 = new RectangleF(1.9375f, 0f, 4, 1); 
      RectangleF rec2 = new RectangleF(1.9375f, .5f, 4, 1); 
      RectangleF rec3 = new RectangleF(1.9375f, 1f, 4, 1); 
      RectangleF rec4 = new RectangleF(1.9375f, 2, 4, 1); 
      RectangleF rec5 = new RectangleF(1.9375f, 2.5f, 4, 1); 
      g.DrawString("Air - " + docTypeDescription, printFont, br, rec1, stringFormat); 

      g.DrawString("*" + docTypeNumber + "*", barcodeFont, br, rec2, stringFormat); 
      g.DrawString(docTypeNumber, printFont, br, rec3, stringFormat); 


      g.DrawString("*" + flightNumber + "*", barcodeFont, br, rec4, stringFormat); 
      g.DrawString(flightNumber, printFont, br, rec5, stringFormat); 


      if (pageNumber < numberOfPages) 
      { 
       e.HasMorePages = true; 

      } 
      else 
       e.HasMorePages = false; 
      pageNumber++; 

     }//end pd_PrintPage Method 


    }//end BarcodePrinter Class 
}//end namespace 

Answer 1

我想通了。我需要在打印頁面處理程序中迭代我的列表。我通過保持每頁的計數來做到這一點。我知道我列表中的項目數量有多少頁。這是我的工作代碼：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Drawing; 
using System.Drawing.Printing; 
using System.Windows.Forms; 

namespace BarcodeTest 
{ 
    class BarcodePrinter 
    { 
     public BarcodePrinter(List<DocumentType> type, string number) 
     { 
      docType = type; 
      flightNumber = number; 
     } 

     //Attributes 
     private List<DocumentType> docType = new List<DocumentType>(); 
     private string flightNumber; 

     //helper variables 
     string docTypeNumber; 
     string docTypeDescription; 
     int pageNumber = 1; 
     int numberOfPages; 
     Font barcodeFont = new Font("3 of 9 Barcode", 36); 
     Font printFont = new Font("Arial", 24); 
     int i = 0; 





     public void Print() 
     { 

      numberOfPages = docType.Count; //# of List elements = # of pages 


      PrintDocument pd = new PrintDocument(); 

      pd.PrintPage += new PrintPageEventHandler(this.pd_PrintPage); 



#if DEBUG 
      PrintPreviewDialog printPreview = new PrintPreviewDialog(); 
      printPreview.Document = pd; 
      printPreview.Show(); 
#else 
      pd.Print(); 
#endif 


     }// end Print() method 


     public void pd_PrintPage(Object sender, PrintPageEventArgs e) 
     { 

      docTypeNumber = docType[i].DocumentTypeNumber; // This is a get/set Property 
      docTypeDescription = docType[i].DocumentDescription; // This is a get/set Property 

      StringFormat stringFormat = new StringFormat(); 
      stringFormat.Alignment = StringAlignment.Center; 
      stringFormat.LineAlignment = StringAlignment.Center; 


      Graphics g = e.Graphics; 
      e.Graphics.PageUnit = GraphicsUnit.Inch; 

      Brush br = new SolidBrush(Color.Black); 
      RectangleF rec1 = new RectangleF(.9375f, 0, 6, 1); 
      RectangleF rec2 = new RectangleF(1.9375f, .5f, 4, 1); 
      RectangleF rec3 = new RectangleF(1.9375f, 1f, 4, 1); 
      RectangleF rec4 = new RectangleF(.9375f, 2, 6, 1); 
      RectangleF rec5 = new RectangleF(1.9375f, 2.5f, 4, 1); 
      g.DrawString("Air - " + docTypeDescription, printFont, br, rec1, stringFormat); 
// '*' Must Preceed and Follow Information for a bar code to be scannable 
      g.DrawString("*" + docTypeNumber + "*", barcodeFont, br, rec2, stringFormat); 
      g.DrawString(docTypeNumber, printFont, br, rec3, stringFormat); 

// '*' Must Preceed and Follow Information for a bar code to be scannable 
      g.DrawString("*" + flightNumber + "*", barcodeFont, br, rec4, stringFormat); 
      g.DrawString(flightNumber, printFont, br, rec5, stringFormat); 



      if (pageNumber < numberOfPages) 
      { 
       e.HasMorePages = true; 
       i++; 
       pageNumber++; 

      } 
      else 
      { 
       e.HasMorePages = false; 
      } 

     }//end pd_PrintPage Method 


    }//end BarcodePrinter Class 
}//end namespace