无法在c＃

Question

嗨这是我的C＃代码：

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();
}

下载了Pdf，但显示无法加载pdf文档。

无法在c＃

中加载pdf文档

我没有找到我在代码中的错误。

请给我正确的代码

感谢。

Answer 1

您没有创建完整的PDF文件。请查看我对问题Trying to get a memory stream from a pdfstamper into a pdfreader but getting: "PDF startxref not found"

的回答

关闭时，PDF文档已完成：

document.Close();

在执行此操作之前，

。

但是，您在关闭文档之前询问MemoryStream ：

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。该课程多年前已被放弃，请阅读documentation about XML Worker。

的介绍

HTMLWorker可能会隐式关闭document对象（我不记得，正如我所说：HTMLWorker不再使用）。在这种情况下，将paragraph对象添加到文档的代码将抛出异常，表示文档已关闭，并且您无法再添加任何额外内容。

Answer 2

@shivakumar，请尝试使用此示例并根据您的数据进行更改。

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();

Answer 3

如果您有一个包含PDF的有效流，并且您正在获取＆＃34;无法加载PDF文档＆＃34;来自Chrome，这肯定会导致问题：

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

＆＃39;附件＆＃39;具体告诉浏览器不在浏览器中显示此文档，而是直接发送文件。我花了几个小时才知道Chrome的PDF查看器在那种情况下会窒息，可能是设计出来了！

试试这个：

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

更多：Content-Disposition:What are the differences between "inline" and "attachment"?