加载 PDF 文档时出错 - iTextSharp PDF

Question

我在 ASP.NET C# 中使用 iTextSharp 生成了一个 PDF 文件。

我尝试为多个元素生成标题 + table。在我想开始一个新页面的每个元素之后。我使用 doc.NewPage() 执行此操作，但是当我生成 PDF 文件时，打开文件时出现以下错误：

Error loading the PDF document

当我尝试在最新版本 Google Chrome 中打开 PDF 文件时出现此错误。当我尝试在 Adobe Reader 中打开文件时，我收到以下错误消息：

There was an error opening this document. The file is damaged and could not be repaired.

PDF文件的大小也只有1kb...

这是我如何生成文件的代码：

//Create a byte array that will eventually hold our final PDF
//must be outside of the foreach loop (and everything else), because we store every single generated table in here for the final pdf!!
Byte[] bytes;

List<TableObject> myTables = getTables();
TableObject currentTable = new TableObject();

//Boilerplate iTextSharp setup here
//Create a stream that we can write to, in this case a MemoryStream
using (MemoryStream ms = new MemoryStream())
{
    //Create an iTextSharp Document which is an abstraction of a PDF but **NOT** a PDF
    using (Document doc = new Document(PageSize.A4, 10f, 10f, 10f, 0f))
    {
        //Create a writer that's bound to our PDF abstraction and our stream
        PdfWriter writer = PdfWriter.GetInstance(doc, ms);

        //Open the document for writing
        doc.Open();

        //writer.CloseStream = false;
        //loop all tableobjects inside the document & the instance of PDFWriter itself! 
        foreach (TableObject to in myTables.ToList())
        {
            //Get the data from database corresponding to the current tableobject and fill all the stuff we need!
            DataTable dt = getDTFromID(to._tableID);
            Object[] genObjects = new Object[5];
            genObjects = gen.generateTable(dt, currentTable._tableName, currentTable._tableID.ToString(), currentTable, true);

            StringBuilder sb = (StringBuilder)genObjects[1];
            String tableName = sb.ToString();
            Table myGenTable = (Table)genObjects[0];
            //String table contains a valid html string, which works in the generate function for a single page document
            String table = genObjects[2].ToString();

            using (StringReader srHtml = new StringReader(table))
            {
                //Parse the HTML
                iTextSharp.tool.xml.XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, srHtml);
            }

            //this will probably render a whole new page at the end of the file!! need to be fixed later!!!
            //doc.NewPage();
        }

        //After all of the PDF "stuff" above is done and closed but **before** we
        //close the MemoryStream, grab all of the active bytes from the stream
        bytes = ms.ToArray();

        doc.Close();
    } 
}

//Now we just need to do something with those bytes.
Response.ContentType = "application/pdf";
Response.AppendHeader("Content-Disposition", "attachment; filename=ShiftReport_complete.pdf");
Response.BinaryWrite(bytes);

如何解决这个问题，以便在打开 PDF 文件时摆脱错误消息？

Answer 1

您的代码像这样完成创建 PDF：

    bytes = ms.ToArray();

    doc.Close();

这是错误的顺序！在 doc.Close() 期间，待处理的 PDF 对象和 PDF 预告片被写入。当您在此之前获取 byte[] 时，您的结果 PDF 缺少这些片段。

反之亦然：

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

加载 PDF 文档时出错 - iTextSharp PDF

Error loading the PDF Document - iTextSharp PDF

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