iTextsharp：在循環中添加圖片和文本（IE，Firefox，Chrome）

Question

我有一個帶有生成pdf文件的按鈕的窗體。該文件通過一系列圖像和文本循環，並將每個圖像和文本插入文檔的絕對位置。我可以添加圖片，沒有文字，效果很好。我還可以在沒有圖像的情況下添加文本，並且一切正常。然而，當我同時添加這兩個，我得到的錯誤

there was an error processing the document. 

下面是代碼

[HttpPost] 
    public FileStreamResult ff(MyModel model) 
    { 
     MemoryStream workStream = new MemoryStream(); 
     Document doc = new Document(); 
     doc.SetMargins(50, 25, 25, 30); 
     PdfWriter.GetInstance(doc, workStream).CloseStream = false; 
     PdfWriter writer = PdfWriter.GetInstance(doc, workStream); 
     writer.CloseStream = false; 
     doc.Open(); 
     PdfContentByte cb = writer.DirectContent; 
     string path = ""; 
     Image Img; 

     int num = 0; 
     float imageSize = 160f, margin = 5f, position = 600; 
     ColumnText ct; 

     foreach (var item in model) 
     { 

      /*ct = new ColumnText(cb); 
      myText = new Phrase(new Chunk(numbering[num] + " " + item.Caption, FontFactory.GetFont(FontFactory.TIMES, 9, Font.ITALIC))); 
      ct.SetSimpleColumn(myText, doc.LeftMargin + margin, position + 5f, imageSize, 2, 15, Element.ALIGN_LEFT); 
      ct.Go(); 
      x += 10; 
      y += 12;*/ 

    /////The code above and the code below(withing the loop) do not work when they are together but work well when they are not together 

      path = item.path; 
      Img = Image.GetInstance(path); 
      Img.ScaleToFit(imageSize, imageSize); 
      Img.SetAbsolutePosition(doc.LeftMargin + margin, position); 
      Img.Border = Rectangle.TOP_BORDER | Rectangle.RIGHT_BORDER | Rectangle.BOTTOM_BORDER | Rectangle.LEFT_BORDER; 
      Img.BorderWidth = 1f; 
      doc.Add(Img); 


      num++; 
      position -= imageSize; 
     } 

     document.Close(); 
     byte[] byteInfo = workStream.ToArray(); 
     workStream.Write(byteInfo, 0, byteInfo.Length); 
     workStream.Position = 0; 

     return new FileStreamResult(workStream, "application/pdf"); 

    } 

Internet Explorer和Firefox顯示錯誤There was an error processing the page. There was an error reading this document(18)。

Chrome確實顯示頁面，但圖片的排列是錯誤的。第二張圖片先出現，最後一張圖片未能顯示，但邊框顯示爲最後一張圖片（如空的畫布）

我在做什麼錯誤？

Answer 1

如果設置結果的文件名，有幫助嗎？

var result = new FileStreamResult(workStream, "application/pdf"); 
result.FileDownloadName = "test.pdf"; 
return result;