Question

我在ASP.NET C＃中使用iTextSharp生成PDF文件。

我尝试为几个元素生成标题+表。在我想要开始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：

加载PDF文档时出错

当我尝试在最新版本的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，出现以下错误消息：

打开此文档时出错。文件已损坏，无法修复。

PDF文件的大小也只有1kb ......

以下是我生成文件的代码：

//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);

如何解决此问题，以便在打开PDF文件时删除错误消息？

Answer 1

您的代码完成了如下所示的PDF创建：

    bytes = ms.ToArray();

    doc.Close();

这是错误的订单！在doc.Close()挂起的PDF对象和PDF预告片写入期间。当您在此之前抓住byte[]时，您的结果PDF会遗漏这些内容。

反过来说：

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

加载PDF文档时出错 - iTextSharp PDF

1 个答案: