如何使用iTextSharp的

Question

我有两个Document对象

如何使用一个合并iTextSharp的这两个Document对象合并两个文档对象？

Answer 1

上腭有一点更容易：

你必须采取PDF文档存储流，并将它们合并起来！

这是一个简单的功能，可以实现这个功能！

 public MemoryStream MemoryStreamMerger(List<MemoryStream> streams) 
     { 

      MemoryStream OurFinalReturnedMemoryStream; 
      using (OurFinalReturnedMemoryStream = new MemoryStream()) 
      { 
       //Create our copy object 
       PdfCopyFields copy = new PdfCopyFields(OurFinalReturnedMemoryStream); 

       //Loop through each MemoryStream 
       foreach (MemoryStream ms in streams) 
       { 
        //Reset the position back to zero 
        ms.Position = 0; 
        //Add it to the copy object 
        copy.AddDocument(new PdfReader(ms)); 
        //Clean up 
        ms.Dispose(); 
       } 
       //Close the copy object 
       copy.Close(); 

       //Get the raw bytes to save to disk 
       //bytes = finalStream.ToArray(); 
      } 
      return new MemoryStream(OurFinalReturnedMemoryStream.ToArray()); 

     } 

Answer 2

按照哈斯先生（与他的代码帮助某处SO），

“不幸的是，据我所知，没有办法合并两个文档对象。这些对象是辅助类它抽象出PDF文件格式的复杂性，这些抽象的“成本”之一是你仅限于单个文档，但正如其他人指出的那样，你可以创建单独的PDF（甚至在内存中）和然后合并它们。“

所以我就是这样做的：

我用PdfCopyFields对象。

MemoryStream realfinalStream = new MemoryStream(); 
MemoryStream[] realstreams = { stream,new MemoryStream(finalStream.ToArray()) }; 

using (realfinalStream) 
     { 
      //Create our copy object 
      PdfCopyFields copy = new PdfCopyFields(realfinalStream); 

      //Loop through each MemoryStream 
      foreach (MemoryStream ms in realstreams) 
      { 
       //Reset the position back to zero 
       ms.Position = 0; 
       //Add it to the copy object 
       copy.AddDocument(new PdfReader(ms)); 
       //Clean up 
       ms.Dispose(); 
      } 
      //Close the copy object 
      copy.Close(); 
     } 
return File(new MemoryStream(realfinalStream.ToArray()), "application/pdf","hello.pdf"); 

FYI

new MemoryStream(realfinalStream.ToArray()) 

我这样做，是因为MemoryString被关闭。