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POitextsharp / MCV combining multiple forms into one PDF using bytes
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  1. POitextsharp / MCV combining multiple forms into one PDF using bytes
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    copied!<p>Hi My applion is MVC3 c#, I am using itextsharp to produce PDF files for pre disgned forms. In this application I have to different forms. To generate a form I use:</p> <pre><code>public ActionResult TestPDF(long learnerID = 211, long courseID = 11) { var caseList = _studyCaseSvc.ListStudyCases().Where(x =&gt; x.Course_ID == courseID); try { MemoryStream memoryStream = new MemoryStream(); PdfConcatenate whole = new PdfConcatenate(memoryStream); foreach (var ca in caseList) { byte[] part = null; if (ca.CaseType == "CTA") { part = GenerateEvaluationCAT_PDF(learnerID, ca.ID); } else if (ca.CaseType == "CTAH") { part = GenerateEvaluationCATH_PDF(learnerID, ca.ID); } else { part = null; } if (part != null) { PdfReader partReader = new PdfReader(part); whole.AddPages(partReader); partReader.Close(); } } whole.Close(); byte[] byteInfo = memoryStream.ToArray(); SendPdfToBrowser(byteInfo); } catch (Exception ex) { } return null; } </code></pre> <p>I get this error: An item with the same key has already been added. The error happens at AddPages. So I developed this simpler test:</p> <pre><code>private void merge() { try { FileStream output = new FileStream("p3.pdf", FileMode.Create); PdfConcatenate pdfConcatenate = new PdfConcatenate(output, true); PdfReader r1 = new PdfReader("p2.pdf"); MemoryStream memoryStream = new MemoryStream(); PdfStamper pdfStamper = new PdfStamper(r1, memoryStream); pdfStamper.FormFlattening = true; pdfStamper.Close(); PdfReader r2 = new PdfReader(memoryStream.ToArray()); //pdfConcatenate.AddPages(tempReader); pdfConcatenate.Open(); int n = r1.NumberOfPages; for (int i = 1; i &lt;= n; i++) { PdfImportedPage imp = pdfConcatenate.Writer.GetImportedPage(r1, i); pdfConcatenate.Writer.AddPage(imp); } pdfConcatenate.Writer.FreeReader(r1); pdfStamper.Close(); r1.Close(); pdfConcatenate.Close(); } catch (Exception ex) { } } </code></pre> <p>Same error. </p>
 

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