未能在C＃中加载PDF文档

你好，这是我的C＃代码：未能在C＃中加载PDF文档

Byte[] bytes; 

int orderID = Convert.ToInt32(e.CommandArgument); 

var templateData = ordersBL.GetTemplateDetails(orderID); 

using (MemoryStream ms = new MemoryStream()) 
{ 

using (Document document = new Document(PageSize.A4, 10, 10, 10, 10)) 
{ 
PdfWriter writer = PdfWriter.GetInstance(document, ms); 
foreach (var temp in templateData.ToList()) 
{ 

string message = temp.Message; 
string tempimage = Convert.ToBase64String(temp.logo); 
string base64 = tempimage; 
byte[] imageBytes = Convert.FromBase64String(base64); 
iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(imageBytes); 
if (image.Height > image.Width) 
{ 
float percentage = 0.0f; 
percentage = 700/image.Height; 
image.ScalePercent(percentage * 100); 
} 
else 

{ 

float percentage = 0.0f; 
percentage = 140/image.Width; 
image.ScalePercent(percentage * 100); 
} 

if (!document.IsOpen()) 
{ 

document.Open(); 
} 
document.Add(image); 
using (var htmlWorker = new HTMLWorker(document)) 
{ 

using (var sr = new StringReader(message)) 
{ 


htmlWorker.Parse(sr); 
} 
} 
Paragraph paragraph = new Paragraph(); 
paragraph.SpacingBefore = 10; 
paragraph.SpacingAfter = 10; 
paragraph.Alignment = Element.ALIGN_LEFT; 
// paragraph.Font = FontFactory.GetFont(FontFactory.HELVETICA, 12f, BaseColor.GREEN); 

document.Add(paragraph); 
document.NewPage(); 
} 
bytes = ms.ToArray(); 
document.Close(); 

} 
} 
Response.ContentType = "application/pdf"; 
string pdfName = "User"; 
Response.AddHeader("Content-Disposition", "attachment; filename=" + pdfName + ".pdf"); 
Response.Buffer = true; 
Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache); 
Response.BinaryWrite(bytes); 
Response.End(); 
Response.Close(); 
Response.Flush(); 
}

全文下载，但它显示未能加载PDF文档。

无法加载PDF文档中的C＃

我没有找到，我在代码中的错误。

请给我正确的代码

谢谢。

来源

2016-04-22 gskumar

你''End''Close'代码Flush'会不喜欢这样的工作。请阅读：https://blogs.msdn.microsoft.com/aspnetue/2010/05/25/response-end-response-close-and-how-customer-feedback-helps-us-improve-msdn-documentation/ 和 http://stackoverflow.com/questions/2816194/use-of-response-flush-before-response-end – Alexander

您并未创建完整的PDF文件。请看看我的问题的答案Trying to get a memory stream from a pdfstamper into a pdfreader but getting: "PDF startxref not found"

，当你关闭一个PDF文件定稿：

document.Close();

的PDF是不完整的，你这样做之前。

但是，你问的是MemoryStream关闭文档前：

bytes = ms.ToArray(); 
document.Close();

这意味着bytes不包含完整的PDF。

此外，您正在使用HTMLWorker。该课程已于多年前被放弃，请阅读documentation about XML Worker的介绍。

有可能HTMLWorker隐含关闭document对象（我不记得，因为我说：HTMLWorker不再使用）。在这种情况下，将paragraph对象添加到文档的代码将引发异常，说明文档已关闭，并且您不能再添加任何额外的内容。

来源

2016-04-22 07:24:22

@shivakumar，请尝试像这个样本，并更改您的数据。

Byte[] bytes = ImageToByteArray(System.Drawing.Image.FromFile(@"D:\Test\Sample1.png")); 
     //Converted Image to byte[] 

     using (MemoryStream ms = new MemoryStream()) 
     { 
      Document document = new Document(PageSize.A4, 10f, 10f, 10f, 0f); 
      PdfWriter.GetInstance(document, Response.OutputStream); 
      document.Open();  
      byte[] imageBytes = bytes; 
      ms.Write(bytes, 0, bytes.Length); 
      iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(imageBytes); 
      if (image.Height > image.Width) 
      { 
       float percentage = 0.0f; 
       percentage = 700/image.Height; 
       image.ScalePercent(percentage * 100); 
      } 
      else 
      { 

       float percentage = 0.0f; 
       percentage = 140/image.Width; 
       image.ScalePercent(percentage * 100); 
      } 

      if (!document.IsOpen()) 
      { 

       document.Open(); 
      } 
      document.Add(image); 
      var htmlWorker = new HTMLWorker(document); 
      string message="hi"; 
      using (var sr = new StringReader(message)) 
      { 


       htmlWorker.Parse(sr); 
      } 

      bytes = ms.ToArray(); 
      document.Close(); 
     } 
     Response.ContentType = "application/pdf"; 
     string pdfName = "User"; 
     Response.AddHeader("Content-Disposition", "attachment; filename=" + pdfName + ".pdf"); 
     Response.Buffer = true; 
     Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache); 
     Response.BinaryWrite(bytes); 
     Response.End(); 
     Response.Close(); 
     Response.Flush();

来源

2016-04-22 07:48:30

如果你有一个包含PDF一个有效的流，而你得到“无法加载PDF文件”从Chrome中，这肯定会导致一个问题：

Response.AddHeader("Content-Disposition", "attachment; filename=" + pdfName + ".pdf");

“附件”专告诉浏览器不是在浏览器中显示此文档，而是直接发送文件。我花了几个小时了解到Chrome的PDF阅读器在这种情况下窒息，可能是通过设计！

试试这个：

Response.AddHeader("Content-Disposition", "inline; filename=" + pdfName + ".pdf");

来源

2016-10-20 21:27:22

未能在C＃中加载PDF文档

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