blocks|key|1701183|text|这是我从一个旧项目中提取的一些代码。这是一个web应用程序，但我使用iTextSharp来合并pdf文件，然后打印它们。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1701184|public+static+class+PdfMerger
++++{
++++++++///+<summary>
++++++++///+Merge+pdf+files.
++++++++///+</summary>
++++++++///+<param+name="sourceFiles">PDF+files+being+merged.</param>
++++++++///+<returns></returns>
++++++++public+static+byte[]+MergeFiles(List<Stream>+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%2B%2B)
++++++++++++++++{
++++++++++++++++++++//+Create+pdf+reader
++++++++++++++++++++PdfReader+reader+=+new+PdfReader(sourceFiles[fileCounter]);
++++++++++++++++++++int+numberOfPages+=+reader.NumberOfPages;

++++++++++++++++++++//+Iterate+through+all+pages
++++++++++++++++++++for+(int+currentPageIndex+=+1;+currentPageIndex+<=
++++++++++++++++++++++++++++++++++++++++numberOfPages;+currentPageIndex%2B%2B)
++++++++++++++++++++{
++++++++++++++++++++++++//+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)+%7C%7C+(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"+%2B
++++++++++++++++++++++++"+occured+during+the+pdf+merging+process.",+exception);
++++++++++++}
++++++++++++finally
++++++++++++{
++++++++++++++++document.Close();
++++++++++++}
++++++++++++return+output.GetBuffer();
++++++++}
++++}



++++///+<summary>
++++///+Implements+custom+page+events.
++++///+</summary>
++++internal+class+PdfPageEvents+:+IPdfPageEvent
++++{
++++++++#region+members
++++++++private+BaseFont+_baseFont+=+null;
++++++++private+PdfContentByte+_content;
++++++++#endregion

++++++++#region+IPdfPageEvent+Members
++++++++public+void+OnOpenDocument(PdfWriter+writer,+Document+document)
++++++++{
++++++++++++_baseFont+=+BaseFont.CreateFont(BaseFont.HELVETICA,
++++++++++++++++++++++++++++++++BaseFont.CP1252,+BaseFont.NOT_EMBEDDED);
++++++++++++_content+=+writer.DirectContent;
++++++++}

++++++++public+void+OnStartPage(PdfWriter+writer,+Document+document)
++++++++{+}

++++++++public+void+OnEndPage(PdfWriter+writer,+Document+document)
++++++++{+}

++++++++public+void+OnCloseDocument(PdfWriter+writer,+Document+document)
++++++++{+}

++++++++public+void+OnParagraph(PdfWriter+writer,
++++++++++++++++++++Document+document,+float+paragraphPosition)
++++++++{+}

++++++++public+void+OnParagraphEnd(PdfWriter+writer,
++++++++++++++++++++Document+document,+float+paragraphPosition)
++++++++{+}

++++++++public+void+OnChapter(PdfWriter+writer,+Document+document,
++++++++++++++++++++++++++++++++float+paragraphPosition,+Paragraph+title)
++++++++{+}

++++++++public+void+OnChapterEnd(PdfWriter+writer,
++++++++++++++++++++Document+document,+float+paragraphPosition)
++++++++{+}

++++++++public+void+OnSection(PdfWriter+writer,+Document+document,
++++++++++++++++++++float+paragraphPosition,+int+depth,+Paragraph+title)
++++++++{+}

++++++++public+void+OnSectionEnd(PdfWriter+writer,
++++++++++++++++++++Document+document,+float+paragraphPosition)
++++++++{+}

++++++++public+void+OnGenericTag(PdfWriter+writer,+Document+document,
++++++++++++++++++++++++++++++++++++Rectangle+rect,+string+text)
++++++++{+}
++++++++#endregion

++++++++private+float+GetCenterTextPosition(string+text,+PdfWriter+writer)
++++++++{
++++++++++++return+writer.PageSize.Width+/+2+-+_baseFont.GetWidthPoint(text,+8)+/+2;
++++++++}
++++}|code-block|syntax|javascript|1701185|这不是我写的，只是做了一些修改。我不记得在哪里找到的了。在我合并PDF之后，我会调用此方法来插入javascript，以便在打开PDF时打开打印对话框。如果您将bSilent更改为true，则它将静默打印到其默认打印机。|1701186|public+Stream+addPrintJStoPDF(Stream+thePDF)
{
++++MemoryStream+outPutStream+=+null;
++++PRStream+finalStream+=+null;
++++PdfDictionary+page+=+null;
++++string+content+=+null;

++++//Open+the+stream+with+iTextSharp
++++var+reader+=+new+PdfReader(thePDF);

++++outPutStream+=+new+MemoryStream(finalStream.GetBytes());
++++var+stamper+=+new+PdfStamper(reader,+(MemoryStream)outPutStream);
++++var+jsText+=+"var+res+=+app.setTimeOut('this.print({bUI:+true,+bSilent:+false,+bShrinkToFit:+false});',+200);";
++++//Add+the+javascript+to+the+PDF
++++stamper.JavaScript+=+jsText;

++++stamper.FormFlattening+=+true;
++++stamper.Writer.CloseStream+=+false;
++++stamper.Close();

++++//Set+the+stream+to+the+beginning
++++outPutStream.Position+=+0;

++++return+outPutStream;
}|1701187|我不确定上面的代码写得有多好，因为我从其他地方拉出了它，我也没有深入研究过iTextSharp，但我知道它确实可以合并我在运行时生成的PDF。|1701188|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Here is some code I pulled out of an old project I had. It was a web application but I was using iTextSharp to merge pdf files then print them.

<pre><code>public static class PdfMerger
 {
 /// &lt;summary&gt;
 /// Merge pdf files.
 /// &lt;/summary&gt;
 /// &lt;param name="sourceFiles"&gt;PDF files being merged.&lt;/param&gt;
 /// &lt;returns&gt;&lt;/returns&gt;
 public static byte[] MergeFiles(List&lt;Stream&gt; 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 &lt; 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 &lt;=
 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.GetBuffer();
 }
 }



 /// &lt;summary&gt;
 /// Implements custom page events.
 /// &lt;/summary&gt;
 internal class PdfPageEvents : IPdfPageEvent
 {
 #region members
 private BaseFont _baseFont = null;
 private PdfContentByte _content;
 #endregion

 #region IPdfPageEvent Members
 public void OnOpenDocument(PdfWriter writer, Document document)
 {
 _baseFont = BaseFont.CreateFont(BaseFont.HELVETICA,
 BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
 _content = writer.DirectContent;
 }

 public void OnStartPage(PdfWriter writer, Document document)
 { }

 public void OnEndPage(PdfWriter writer, Document document)
 { }

 public void OnCloseDocument(PdfWriter writer, Document document)
 { }

 public void OnParagraph(PdfWriter writer,
 Document document, float paragraphPosition)
 { }

 public void OnParagraphEnd(PdfWriter writer,
 Document document, float paragraphPosition)
 { }

 public void OnChapter(PdfWriter writer, Document document,
 float paragraphPosition, Paragraph title)
 { }

 public void OnChapterEnd(PdfWriter writer,
 Document document, float paragraphPosition)
 { }

 public void OnSection(PdfWriter writer, Document document,
 float paragraphPosition, int depth, Paragraph title)
 { }

 public void OnSectionEnd(PdfWriter writer,
 Document document, float paragraphPosition)
 { }

 public void OnGenericTag(PdfWriter writer, Document document,
 Rectangle rect, string text)
 { }
 #endregion

 private float GetCenterTextPosition(string text, PdfWriter writer)
 {
 return writer.PageSize.Width / 2 - _baseFont.GetWidthPoint(text, 8) / 2;
 }
 }
</code></pre>

I didn't write this, but made some modifications. I can't remember where I found it. After I merged the PDFs I would call this method to insert javascript to open the print dialog when the PDF is opened. If you change bSilent to true then it should print silently to their default printer.

<pre><code>public Stream addPrintJStoPDF(Stream thePDF)
{
 MemoryStream outPutStream = null;
 PRStream finalStream = null;
 PdfDictionary page = null;
 string content = null;

 //Open the stream with iTextSharp
 var reader = new PdfReader(thePDF);

 outPutStream = new MemoryStream(finalStream.GetBytes());
 var stamper = new PdfStamper(reader, (MemoryStream)outPutStream);
 var jsText = "var res = app.setTimeOut('this.print({bUI: true, bSilent: false, bShrinkToFit: false});', 200);";
 //Add the javascript to the PDF
 stamper.JavaScript = jsText;

 stamper.FormFlattening = true;
 stamper.Writer.CloseStream = false;
 stamper.Close();

 //Set the stream to the beginning
 outPutStream.Position = 0;

 return outPutStream;
}
</code></pre>

Not sure how well the above code is written since I pulled it from somewhere else and I haven't worked in depth at all with iTextSharp but I do know that it did work at merging PDFs that I was generating at runtime.

blocks|key|1914738|text|我使用iTextsharp和c#来组合pdf文件。这是我使用的代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1914739|string[]+lstFiles=new+string[3];
++++lstFiles[0]=@"C:/pdf/1.pdf";
++++lstFiles[1]=@"C:/pdf/2.pdf";
++++lstFiles[2]=@"C:/pdf/3.pdf";

++++PdfReader+reader+=+null;
++++Document+sourceDocument+=+null;
++++PdfCopy+pdfCopyProvider+=+null;
++++PdfImportedPage+importedPage;
++++string+outputPdfPath=@"C:/pdf/new.pdf";


++++sourceDocument+=+new+Document();
++++pdfCopyProvider+=+new+PdfCopy(sourceDocument,+new+System.IO.FileStream(outputPdfPath,+System.IO.FileMode.Create));

++++//Open+the+output+file
++++sourceDocument.Open();

++++try
++++{
++++++++//Loop+through+the+files+list
++++++++for+(int+f+=+0;+f+<+lstFiles.Length-1;+f%2B%2B)
++++++++{
++++++++++++int+pages+=get_pageCcount(lstFiles[f]);

++++++++++++reader+=+new+PdfReader(lstFiles[f]);
++++++++++++//Add+pages+of+current+file
++++++++++++for+(int+i+=+1;+i+<=+pages;+i%2B%2B)
++++++++++++{
++++++++++++++++importedPage+=+pdfCopyProvider.GetImportedPage(reader,+i);
++++++++++++++++pdfCopyProvider.AddPage(importedPage);
++++++++++++}

++++++++++++reader.Close();
+++++++++}
++++++++//At+the+end+save+the+output+file
++++++++sourceDocument.Close();
++++}
++++catch+(Exception+ex)
++++{
++++++++throw+ex;
++++}


private+int+get_pageCcount(string+file)
{
++++using+(StreamReader+sr+=+new+StreamReader(File.OpenRead(file)))
++++{
++++++++Regex+regex+=+new+Regex(@"/Type\s*/Page[%5Es]");
++++++++MatchCollection+matches+=+regex.Matches(sr.ReadToEnd());

++++++++return+matches.Count;
++++}
}|code-block|syntax|javascript|1914740|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I used iTextsharp with c# to combine pdf files. This is the code I used.

<pre><code>string[] lstFiles=new string[3];
 lstFiles[0]=@"C:/pdf/1.pdf";
 lstFiles[1]=@"C:/pdf/2.pdf";
 lstFiles[2]=@"C:/pdf/3.pdf";

 PdfReader reader = null;
 Document sourceDocument = null;
 PdfCopy pdfCopyProvider = null;
 PdfImportedPage importedPage;
 string outputPdfPath=@"C:/pdf/new.pdf";


 sourceDocument = new Document();
 pdfCopyProvider = new PdfCopy(sourceDocument, new System.IO.FileStream(outputPdfPath, System.IO.FileMode.Create));

 //Open the output file
 sourceDocument.Open();

 try
 {
 //Loop through the files list
 for (int f = 0; f &lt; lstFiles.Length-1; f++)
 {
 int pages =get_pageCcount(lstFiles[f]);

 reader = new PdfReader(lstFiles[f]);
 //Add pages of current file
 for (int i = 1; i &lt;= pages; i++)
 {
 importedPage = pdfCopyProvider.GetImportedPage(reader, i);
 pdfCopyProvider.AddPage(importedPage);
 }

 reader.Close();
 }
 //At the end save the output file
 sourceDocument.Close();
 }
 catch (Exception ex)
 {
 throw ex;
 }


private int get_pageCcount(string file)
{
 using (StreamReader sr = new StreamReader(File.OpenRead(file)))
 {
 Regex regex = new Regex(@"/Type\s*/Page[^s]");
 MatchCollection matches = regex.Matches(sr.ReadToEnd());

 return matches.Count;
 }
}
</code></pre>

blocks|key|1701296|text|为了避免提到的内存问题，我使用文件流而不是内存流(在ITextSharp+Out+of+memory+exception+merging+multiple+pdf中提到)来合并pdf文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1701297|++++++++var+parentDirectory+=+Directory.GetParent(SelectedDocuments[0].FilePath);
++++++++var+savePath+=+parentDirectory+%2B+"\\MergedDocument.pdf";

++++++++using+(var+fs+=+new+FileStream(savePath,+FileMode.Create))
++++++++{
++++++++++++using+(var+document+=+new+Document())
++++++++++++{
++++++++++++++++using+(var+pdfCopy+=+new+PdfCopy(document,+fs))
++++++++++++++++{
++++++++++++++++++++document.Open();
++++++++++++++++++++for+(var+i+=+0;+i+<+SelectedDocuments.Count;+i%2B%2B)
++++++++++++++++++++{
++++++++++++++++++++++++using+(var+pdfReader+=+new+PdfReader(SelectedDocuments[i].FilePath))
++++++++++++++++++++++++{
++++++++++++++++++++++++++++for+(var+page+=+0;+page+<+pdfReader.NumberOfPages;)
++++++++++++++++++++++++++++{
++++++++++++++++++++++++++++++++pdfCopy.AddPage(pdfCopy.GetImportedPage(pdfReader,+%2B%2Bpage));
++++++++++++++++++++++++++++}
++++++++++++++++++++++++}
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}
++++++++}|code-block|syntax|javascript|1701298|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/29415008/itextsharp-out-of-memory-exception-merging-multiple-pdf^0|Q|1J|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

To avoid the memory issues mentioned, I used file stream instead of memory stream(mentioned in <a href="https://stackoverflow.com/questions/29415008/itextsharp-out-of-memory-exception-merging-multiple-pdf">ITextSharp Out of memory exception merging multiple pdf</a>) to merge pdf files:

<pre><code> var parentDirectory = Directory.GetParent(SelectedDocuments[0].FilePath);
 var savePath = parentDirectory + "\\MergedDocument.pdf";

 using (var fs = new FileStream(savePath, FileMode.Create))
 {
 using (var document = new Document())
 {
 using (var pdfCopy = new PdfCopy(document, fs))
 {
 document.Open();
 for (var i = 0; i &lt; SelectedDocuments.Count; i++)
 {
 using (var pdfReader = new PdfReader(SelectedDocuments[i].FilePath))
 {
 for (var page = 0; page &lt; pdfReader.NumberOfPages;)
 {
 pdfCopy.AddPage(pdfCopy.GetImportedPage(pdfReader, ++page));
 }
 }
 }
 }
 }
 }
</code></pre>

blocks|key|1701319|text|使用iTextSharp-LGPL+4.1.6测试：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1701320|++++public+static+byte[]+ConcatenatePdfs(IEnumerable<byte[]>+documents)
++++{
++++++++using+(var+ms+=+new+MemoryStream())
++++++++{
++++++++++++var+outputDocument+=+new+Document();
++++++++++++var+writer+=+new+PdfCopy(outputDocument,+ms);
++++++++++++outputDocument.Open();

++++++++++++foreach+(var+doc+in+documents)
++++++++++++{
++++++++++++++++var+reader+=+new+PdfReader(doc);
++++++++++++++++for+(var+i+=+1;+i+<=+reader.NumberOfPages;+i%2B%2B)
++++++++++++++++{
++++++++++++++++++++writer.AddPage(writer.GetImportedPage(reader,+i));
++++++++++++++++}
++++++++++++++++writer.FreeReader(reader);
++++++++++++++++reader.Close();
++++++++++++}

++++++++++++writer.Close();
++++++++++++outputDocument.Close();
++++++++++++var+allPagesContent+=+ms.GetBuffer();
++++++++++++ms.Flush();

++++++++++++return+allPagesContent;
++++++++}
++++}|code-block|syntax|javascript|1701321|entityMap|0|LINK|mutability|MUTABLE|url|https://www.nuget.org/packages/iTextSharp-LGPL/^0|2|F|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Tested with <a href="https://www.nuget.org/packages/iTextSharp-LGPL/" rel="noreferrer">iTextSharp-LGPL</a> 4.1.6:

<pre><code> public static byte[] ConcatenatePdfs(IEnumerable&lt;byte[]&gt; documents)
 {
 using (var ms = new MemoryStream())
 {
 var outputDocument = new Document();
 var writer = new PdfCopy(outputDocument, ms);
 outputDocument.Open();

 foreach (var doc in documents)
 {
 var reader = new PdfReader(doc);
 for (var i = 1; i &lt;= reader.NumberOfPages; i++)
 {
 writer.AddPage(writer.GetImportedPage(reader, i));
 }
 writer.FreeReader(reader);
 reader.Close();
 }

 writer.Close();
 outputDocument.Close();
 var allPagesContent = ms.GetBuffer();
 ms.Flush();

 return allPagesContent;
 }
 }
</code></pre>

blocks|key|1914807|text|****/*For+Multiple+PDF+Print..!!*/****

<button+type="button"+id="btnPrintMultiplePdf"+runat="server"+class="btn+btn-primary+btn-border+btn-sm"
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++onserverclick="btnPrintMultiplePdf_click">
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++<i+class="fa+fa-file-pdf-o">Print+Multiple+pdf</button>

protected+void+btnPrintMultiplePdf_click(object+sender,+EventArgs+e)
++++{
++++++++if+(ValidateForMultiplePDF()+==+true)
++++++++{
++++++++++++#region+Declare+Temp+Variables..!!
++++++++++++CheckBox+chkList+=+new+CheckBox();
++++++++++++HiddenField+HidNo+=+new+HiddenField();

++++++++++++string+Multi_fofile,+Multi_listfile;
++++++++++++Multi_fofile+=+Multi_listfile+=+"";
++++++++++++Multi_fofile+=+Server.MapPath("PDFRNew");
++++++++++++#endregion

++++++++++++for+(int+i+=+0;+i+<+grdRnew.Rows.Count;+i%2B%2B)
++++++++++++{
++++++++++++++++#region+Find+Grd+Controls..!!
++++++++++++++++CheckBox+Chk_One+=+(CheckBox)grdRnew.Rows[i].FindControl("chkOne");
++++++++++++++++Label+lbl_Year+=+(Label)grdRnew.Rows[i].FindControl("lblYear");
++++++++++++++++Label+lbl_No+=+(Label)grdRnew.Rows[i].FindControl("lblCode");
++++++++++++++++#endregion

++++++++++++++++if+(Chk_One.Checked+==+true)
++++++++++++++++{
++++++++++++++++++++HidNo+.Value+=+llbl_No+.Text.Trim()%2B+lbl_Year+.Text;

++++++++++++++++++++if+(File.Exists(Multi_fofile+%2B+"\\"+%2B+HidNo.Value.ToString()+%2B+".pdf"))
++++++++++++++++++++{
++++++++++++++++++++++++#region+Get+Multiple+Files+Name+And+Paths..!!
++++++++++++++++++++++++if+(Multi_listfile+!=+"")
++++++++++++++++++++++++{
++++++++++++++++++++++++++++Multi_listfile+=+Multi_listfile+%2B+",";
++++++++++++++++++++++++}
++++++++++++++++++++++++Multi_listfile+=+Multi_listfile+%2B+Multi_fofile+%2B+"\\"+%2B+HidNo.Value.ToString()+%2B+".pdf";

++++++++++++++++++++++++#endregion
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}

++++++++++++#region+For+Generate+Multiple+Pdf..!!
++++++++++++if+(Multi_listfile+!=+"")
++++++++++++{
++++++++++++++++String[]+Multifiles+=+Multi_listfile.Split(',');
++++++++++++++++string+DestinationFile+=+Server.MapPath("PDFRNew")+%2B+"\\Multiple.Pdf";
++++++++++++++++MergeFiles(DestinationFile,+Multifiles);

++++++++++++++++Response.ContentType+=+"pdf";
++++++++++++++++Response.AddHeader("Content-Disposition",+"attachment;filename=\""+%2B+DestinationFile+%2B+"\"");
++++++++++++++++Response.TransmitFile(DestinationFile);
++++++++++++++++Response.End();
++++++++++++}
++++++++++++else
++++++++++++{

++++++++++++}
++++++++++++#endregion
++++++++}
++++}

++++private+void+MergeFiles(string+DestinationFile,+string[]+SourceFiles)
++++{
++++++++try
++++++++{
++++++++++++int+f+=+0;
++++++++++++/**we+create+a+reader+for+a+certain+Document**/
++++++++++++PdfReader+reader+=+new+PdfReader(SourceFiles[f]);
++++++++++++/**we+retrieve+the+total+number+of+pages**/
++++++++++++int+n+=+reader.NumberOfPages;
++++++++++++/**Console.WriteLine("There+are+"+%2B+n+%2B+"+pages+in+the+original+file.")**/
++++++++++++/**Step+1:+creation+of+a+document-object**/
++++++++++++Document+document+=+new+Document(reader.GetPageSizeWithRotation(1));
++++++++++++/**Step+2:+we+create+a+writer+that+listens+to+the+Document**/
++++++++++++PdfWriter+writer+=+PdfWriter.GetInstance(document,+new+FileStream(DestinationFile,+FileMode.Create));
++++++++++++/**Step+3:+we+open+the+Document**/
++++++++++++document.Open();
++++++++++++PdfContentByte+cb+=+writer.DirectContent;
++++++++++++PdfImportedPage+page;
++++++++++++int+rotation;
++++++++++++/**Step+4:+We+Add+Content**/
++++++++++++while+(f+<+SourceFiles.Length)
++++++++++++{
++++++++++++++++int+i+=+0;
++++++++++++++++while+(i+<+n)
++++++++++++++++{
++++++++++++++++++++i%2B%2B;
++++++++++++++++++++document.SetPageSize(reader.GetPageSizeWithRotation(i));
++++++++++++++++++++document.NewPage();
++++++++++++++++++++page+=+writer.GetImportedPage(reader,+i);
++++++++++++++++++++rotation+=+reader.GetPageRotation(i);
++++++++++++++++++++if+(rotation+==+90+%7C%7C+rotation+==+270)
++++++++++++++++++++{
++++++++++++++++++++++++cb.AddTemplate(page,+0,+-1f,+1f,+0,+0,+reader.GetPageSizeWithRotation(i).Height);
++++++++++++++++++++}
++++++++++++++++++++else
++++++++++++++++++++{
++++++++++++++++++++++++cb.AddTemplate(page,+1f,+0,+0,+1f,+0,+0);
++++++++++++++++++++}
++++++++++++++++++++/**Console.WriteLine("Processed+page+"+%2B+i)**/
++++++++++++++++}
++++++++++++++++f%2B%2B;
++++++++++++++++if+(f+<+SourceFiles.Length)
++++++++++++++++{
++++++++++++++++++++reader+=+new+PdfReader(SourceFiles[f]);
++++++++++++++++++++/**we+retrieve+the+total+number+of+pages**/
++++++++++++++++++++n+=+reader.NumberOfPages;
++++++++++++++++++++/**Console.WriteLine("There+are"%2Bn%2B"pages+in+the+original+file.")**/
++++++++++++++++}
++++++++++++}
++++++++++++/**Step+5:+we+Close+the+Document**/
++++++++++++document.Close();
++++++++}
++++++++catch+(Exception+e)
++++++++{
++++++++++++string+strOb+=+e.Message;
++++++++}
++++}

++++private+bool+ValidateForMultiplePDF()
++++{
++++++++bool+chkList+=+false;

++++++++foreach+(GridViewRow+gvr+in+grdRnew.Rows)
++++++++{
++++++++++++CheckBox+Chk_One+=+(CheckBox)gvr.FindControl("ChkSelectOne");
++++++++++++if+(Chk_One.Checked+==+true)
++++++++++++{
++++++++++++++++chkList+=+true;
++++++++++++}
++++++++}
++++++++if+(chkList+==+false)
++++++++{
++++++++++++divStatusMsg.Style.Add("display",+"");
++++++++++++divStatusMsg.Attributes.Add("class",+"alert+alert-danger+alert-dismissable");
++++++++++++divStatusMsg.InnerText+=+"ERROR+!!...Please+Check+At+Least+On+CheckBox.";
++++++++++++grdRnew.Focus();
++++++++++++set_timeout();
++++++++++++return+false;
++++++++}
++++++++return+true;
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1914808|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>****/*For Multiple PDF Print..!!*/****

&lt;button type="button" id="btnPrintMultiplePdf" runat="server" class="btn btn-primary btn-border btn-sm"
 onserverclick="btnPrintMultiplePdf_click"&gt;
 &lt;i class="fa fa-file-pdf-o"&gt;&lt;/i&gt;Print Multiple pdf&lt;/button&gt;

protected void btnPrintMultiplePdf_click(object sender, EventArgs e)
 {
 if (ValidateForMultiplePDF() == true)
 {
 #region Declare Temp Variables..!!
 CheckBox chkList = new CheckBox();
 HiddenField HidNo = new HiddenField();

 string Multi_fofile, Multi_listfile;
 Multi_fofile = Multi_listfile = "";
 Multi_fofile = Server.MapPath("PDFRNew");
 #endregion

 for (int i = 0; i &lt; grdRnew.Rows.Count; i++)
 {
 #region Find Grd Controls..!!
 CheckBox Chk_One = (CheckBox)grdRnew.Rows[i].FindControl("chkOne");
 Label lbl_Year = (Label)grdRnew.Rows[i].FindControl("lblYear");
 Label lbl_No = (Label)grdRnew.Rows[i].FindControl("lblCode");
 #endregion

 if (Chk_One.Checked == true)
 {
 HidNo .Value = llbl_No .Text.Trim()+ lbl_Year .Text;

 if (File.Exists(Multi_fofile + "\\" + HidNo.Value.ToString() + ".pdf"))
 {
 #region Get Multiple Files Name And Paths..!!
 if (Multi_listfile != "")
 {
 Multi_listfile = Multi_listfile + ",";
 }
 Multi_listfile = Multi_listfile + Multi_fofile + "\\" + HidNo.Value.ToString() + ".pdf";

 #endregion
 }
 }
 }

 #region For Generate Multiple Pdf..!!
 if (Multi_listfile != "")
 {
 String[] Multifiles = Multi_listfile.Split(',');
 string DestinationFile = Server.MapPath("PDFRNew") + "\\Multiple.Pdf";
 MergeFiles(DestinationFile, Multifiles);

 Response.ContentType = "pdf";
 Response.AddHeader("Content-Disposition", "attachment;filename=\"" + DestinationFile + "\"");
 Response.TransmitFile(DestinationFile);
 Response.End();
 }
 else
 {

 }
 #endregion
 }
 }

 private void MergeFiles(string DestinationFile, string[] SourceFiles)
 {
 try
 {
 int f = 0;
 /**we create a reader for a certain Document**/
 PdfReader reader = new PdfReader(SourceFiles[f]);
 /**we retrieve the total number of pages**/
 int n = reader.NumberOfPages;
 /**Console.WriteLine("There are " + n + " pages in the original file.")**/
 /**Step 1: creation of a document-object**/
 Document document = new Document(reader.GetPageSizeWithRotation(1));
 /**Step 2: we create a writer that listens to the Document**/
 PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(DestinationFile, FileMode.Create));
 /**Step 3: we open the Document**/
 document.Open();
 PdfContentByte cb = writer.DirectContent;
 PdfImportedPage page;
 int rotation;
 /**Step 4: We Add Content**/
 while (f &lt; SourceFiles.Length)
 {
 int i = 0;
 while (i &lt; n)
 {
 i++;
 document.SetPageSize(reader.GetPageSizeWithRotation(i));
 document.NewPage();
 page = writer.GetImportedPage(reader, i);
 rotation = reader.GetPageRotation(i);
 if (rotation == 90 || rotation == 270)
 {
 cb.AddTemplate(page, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(i).Height);
 }
 else
 {
 cb.AddTemplate(page, 1f, 0, 0, 1f, 0, 0);
 }
 /**Console.WriteLine("Processed page " + i)**/
 }
 f++;
 if (f &lt; SourceFiles.Length)
 {
 reader = new PdfReader(SourceFiles[f]);
 /**we retrieve the total number of pages**/
 n = reader.NumberOfPages;
 /**Console.WriteLine("There are"+n+"pages in the original file.")**/
 }
 }
 /**Step 5: we Close the Document**/
 document.Close();
 }
 catch (Exception e)
 {
 string strOb = e.Message;
 }
 }

 private bool ValidateForMultiplePDF()
 {
 bool chkList = false;

 foreach (GridViewRow gvr in grdRnew.Rows)
 {
 CheckBox Chk_One = (CheckBox)gvr.FindControl("ChkSelectOne");
 if (Chk_One.Checked == true)
 {
 chkList = true;
 }
 }
 if (chkList == false)
 {
 divStatusMsg.Style.Add("display", "");
 divStatusMsg.Attributes.Add("class", "alert alert-danger alert-dismissable");
 divStatusMsg.InnerText = "ERROR !!...Please Check At Least On CheckBox.";
 grdRnew.Focus();
 set_timeout();
 return false;
 }
 return true;
 }
</code></pre>

How to merge multiple pdf files (generated on run time) through <code>ItextSharp</code> then printing them.

I found the following <a href="https://stackoverflow.com/questions/6029142/merging-multiple-pdfs-using-itextsharp-in-c-net">link</a> but that method requires the pdf names considering that the pdf files stored and this is not my case .

<hr>

I have multiple reports i'll convert them to <code>pdf files</code> through this method :

<pre><code>private void AddReportToResponse(LocalReport followsReport)
{
 string mimeType;
 string encoding;
 string extension;
 string[] streams = new string[100];
 Warning[] warnings = new Warning[100];
 byte[] pdfStream = followsReport.Render("PDF", "", out mimeType, out encoding, out extension, out streams, out warnings);
 //Response.Clear();
 //Response.ContentType = mimeType;
 //Response.AddHeader("content-disposition", "attachment; filename=Application." + extension);
 //Response.BinaryWrite(pdfStream);
 //Response.End();
}
</code></pre>

Now i want to merge all those generated files (<code>Bytes</code>) in one pdf file to print it

How to merge multiple pdf files (generated in run time)?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何通过ItextSharp合并多个pdf文件(在运行时生成)，然后打印它们。我找到了以下，但考虑到存储的是pdf文件，该方法需要pdf名称，而这不是我的情况。我有多个报告，我将通过以下方法将它们转换为pdf files：private void AddReportToResponse(LocalReport foll...

问如何合并多个pdf文件(在运行时生成)？
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