合并内存流以在c＃中创建http PDF响应

我试图将2个水晶报告合并为单个pdf文件，我正在使用Itextsharp v5.1.1。 但它说文件无法打开。 它可能已损坏。 没有构建错误。 但pdf格式不正确，无法打开。 这是我选择完成此任务的顺序。

1. 以pdf格式将Crystal报表导出到MemoryStream1
2. 将第二个报告导出到MemoryStream2中。
3. 合并内存流
4. 将Streams发送到Http输出响应为PDF。

以下是订单中每个步骤的代码。

/// Get the Dataset from Stored Procedure for the CSSource Report dsCS = CSData.GetUSSourceXML(ds_input); /// Create the Report of type CSsource rptCS = ReportFactory.GetReport(typeof(CSsource)); rptCS .SetDataSource(dsCS); /// Set the Parameters to the CS report rptCS .ParameterFields["Parameterid"].CurrentValues.Clear(); rptCS .SetParameterValue("Parameterid", PID); //// Serialize the Object as PDF msCS=(MemoryStream)rptCS .ExportToStream(ExportFormatType.PortableDocFormat); 

对于第2步

  /// Get the Dataset from Stored Procedure for the Aden Report dsAd = CSData.GetAdden(ds_input); /// Create the Report of type Aden rptAd = ReportFactory.GetReport(typeof(Aden)); rptAd.SetDataSource(dsAd ); /// Set the Parameters to the Aden report rptAd.ParameterFields["Parameterid"].CurrentValues.Clear(); rptAd.SetParameterValue("Parameterid", PID); //// Serialize the Object as PDF msAD = (MemoryStream)rptAd.ExportToStream(ExportFormatType.PortableDocFormat); 

对于第3步

  System.Collections.Generic.List sourceFiles = new List(); sourceFiles.Add(msCS.ToArray()); sourceFiles.Add(msAD.ToArray()); PdfMerger mpdfs = new PdfMerger(); /// ms is the Memory stream to which both the streams are added ms=mpdfs.MergeFiles(sourceFiles); 

MergeFiles方法如下

  public MemoryStream MergeFiles(Generic.List sourceFiles) { Document document = new Document(); MemoryStream output = new MemoryStream(); try { // Initialize pdf writer PdfWriter writer = PdfWriter.GetInstance(document, output); //writer.PageEvent = new PdfPageEvents(); // Open document to write document.Open(); PdfContentByte content = writer.DirectContent; // Iterate through all pdf documents for (int fileCounter = 0; fileCounter < sourceFiles.Count; fileCounter++) { // Create pdf reader PdfReader reader = new PdfReader(sourceFiles[fileCounter]); int numberOfPages = reader.NumberOfPages; // Iterate through all pages for (int currentPageIndex = 1; currentPageIndex <= numberOfPages; currentPageIndex++) { // Determine page size for the current page document.SetPageSize( reader.GetPageSizeWithRotation(currentPageIndex)); // Create page document.NewPage(); PdfImportedPage importedPage = writer.GetImportedPage(reader, currentPageIndex); // Determine page orientation int pageOrientation = reader.GetPageRotation(currentPageIndex); if ((pageOrientation == 90) || (pageOrientation == 270)) { content.AddTemplate(importedPage, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(currentPageIndex).Height); } else { content.AddTemplate(importedPage, 1f, 0, 0, 1f, 0, 0); } } } } catch (Exception exception) { throw new Exception("There has an unexpected exception" + " occured during the pdf merging process.", exception); } finally { // document.Close(); } return output; } 

步骤4将内存流序列化为PDF

  // ms is the memory stream which is to be converted to PDF Response.Clear(); Response.ClearContent(); Response.ClearHeaders(); Response.ContentType = "application/pdf"; Response.Charset = string.Empty; Response.AddHeader("Content-Disposition", "attachment; filename=" + "Application of " + FullName.Trim() + ".pdf"); //Write the file directly to the HTTP content output stream. Response.OutputStream.Write(ms.ToArray(), 0, Convert.ToInt32(ms.Length)); Response.OutputStream.Flush(); Response.OutputStream.Close(); rptCS.Close(); rptCS.Dispose(); rptAd.Close(); rptAd.Dispose(); 

感谢所有开发人员帮助我解决这个问题。 这是紧急的，因为它必须在一天或2日生产。请回复。

Chandanan。

Answer 1

这是一个简单的合并方法，可将PDF文件复制到一个PDF中。 合并pdf时我经常使用这种方法。 希望能帮助到你。

  public MemoryStream MergePdfForms(List files) { if (files.Count > 1) { PdfReader pdfFile; Document doc; PdfWriter pCopy; MemoryStream msOutput = new MemoryStream(); pdfFile = new PdfReader(files[0]); doc = new Document(); pCopy = new PdfSmartCopy(doc, msOutput); doc.Open(); for (int k = 0; k < files.Count; k++) { pdfFile = new PdfReader(files[k]); for (int i = 1; i < pdfFile.NumberOfPages + 1; i++) { ((PdfSmartCopy)pCopy).AddPage(pCopy.GetImportedPage(pdfFile, i)); } pCopy.FreeReader(pdfFile); } pdfFile.Close(); pCopy.Close(); doc.Close(); return msOutput; } else if (files.Count == 1) { return new MemoryStream(files[0]); } return null; } 

第4步尝试：

  rptCS.Close(); rptCS.Dispose(); rptAd.Close(); rptAd.Dispose(); Response.Clear(); Response.ContentType = "application/pdf"; Response.AddHeader("Content-Disposition", "attachment; filename=" + "Application of " + FullName.Trim() + ".pdf"); Response.BinaryWrite(ms.ToArray()); ApplicationInstance.CompleteRequest();