Объединение нескольких PDF файлов с помощью iTextSharp в С#.net

Ответ 1

Я нашел ответ:

Вместо второго метода добавьте больше файлов в первый массив входных файлов.

public static void CombineMultiplePDFs(string[] fileNames, string outFile)
{
    // step 1: creation of a document-object
    Document document = new Document();

    // step 2: we create a writer that listens to the document
    PdfCopy writer = new PdfCopy(document, new FileStream(outFile, FileMode.Create));
    if (writer == null)
    {
        return;
    }

    // step 3: we open the document
    document.Open();

    foreach (string fileName in fileNames)
    {
        // we create a reader for a certain document
        PdfReader reader = new PdfReader(fileName);
        reader.ConsolidateNamedDestinations();

        // step 4: we add content
        for (int i = 1; i <= reader.NumberOfPages; i++)
        {                
            PdfImportedPage page = writer.GetImportedPage(reader, i);
            writer.AddPage(page);
        }

        PRAcroForm form = reader.AcroForm;
        if (form != null)
        {
            writer.CopyAcroForm(reader);
        }

        reader.Close();
    }

    // step 5: we close the document and writer
    writer.Close();
    document.Close();
}

Ответ 2

Я нашел очень приятное решение на этом сайте: http://weblogs.sqlteam.com/mladenp/archive/2014/01/10/simple-merging-of-pdf-documents-with-itextsharp-5-4-5.aspx

Я обновляю метод в этом режиме:

    public static bool MergePDFs(IEnumerable<string> fileNames, string targetPdf)
    {
        bool merged = true;
        using (FileStream stream = new FileStream(targetPdf, FileMode.Create))
        {
            Document document = new Document();
            PdfCopy pdf = new PdfCopy(document, stream);
            PdfReader reader = null;
            try
            {
                document.Open();
                foreach (string file in fileNames)
                {
                    reader = new PdfReader(file);
                    pdf.AddDocument(reader);
                    reader.Close();
                }
            }
            catch (Exception)
            {
                merged = false;
                if (reader != null)
                {
                    reader.Close();
                }
            }
            finally
            {
                if (document != null)
                {
                    document.Close();
                }
            }
        }
        return merged;
    }

Ответ 3

Код для слияния PDF в Itextsharp

 public static void Merge(List<String> InFiles, String OutFile)
    {

        using (FileStream stream = new FileStream(OutFile, FileMode.Create))
        using (Document doc = new Document())
        using (PdfCopy pdf = new PdfCopy(doc, stream))
        {
            doc.Open();

            PdfReader reader = null;
            PdfImportedPage page = null;

            //fixed typo
            InFiles.ForEach(file =>
            {
                reader = new PdfReader(file);

                for (int i = 0; i < reader.NumberOfPages; i++)
                {
                    page = pdf.GetImportedPage(reader, i + 1);
                    pdf.AddPage(page);
                }

                pdf.FreeReader(reader);
                reader.Close();
                File.Delete(file);
            });
        }

Ответ 4

Использование iTextSharp.dll

protected void Page_Load(object sender, EventArgs e)
{
    String[] files = @"C:\ENROLLDOCS\A1.pdf,C:\ENROLLDOCS\A2.pdf".Split(',');
    MergeFiles(@"C:\ENROLLDOCS\New1.pdf", files);
}
public void MergeFiles(string destinationFile, string[] sourceFiles)
{
    if (System.IO.File.Exists(destinationFile))
        System.IO.File.Delete(destinationFile);

    string[] sSrcFile;
    sSrcFile = new string[2];

    string[] arr = new string[2];
    for (int i = 0; i <= sourceFiles.Length - 1; i++)
    {
        if (sourceFiles[i] != null)
        {
            if (sourceFiles[i].Trim() != "")
                arr[i] = sourceFiles[i].ToString();
        }
    }

    if (arr != null)
    {
        sSrcFile = new string[2];

        for (int ic = 0; ic <= arr.Length - 1; ic++)
        {
            sSrcFile[ic] = arr[ic].ToString();
        }
    }
    try
    {
        int f = 0;

        PdfReader reader = new PdfReader(sSrcFile[f]);
        int n = reader.NumberOfPages;
        Response.Write("There are " + n + " pages in the original file.");
        Document document = new Document(PageSize.A4);

        PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(destinationFile, FileMode.Create));

        document.Open();
        PdfContentByte cb = writer.DirectContent;
        PdfImportedPage page;

        int rotation;
        while (f < sSrcFile.Length)
        {
            int i = 0;
            while (i < n)
            {
                i++;

                document.SetPageSize(PageSize.A4);
                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);
                }
                Response.Write("\n Processed page " + i);
            }

            f++;
            if (f < sSrcFile.Length)
            {
                reader = new PdfReader(sSrcFile[f]);
                n = reader.NumberOfPages;
                Response.Write("There are " + n + " pages in the original file.");
            }
        }
        Response.Write("Success");
        document.Close();
    }
    catch (Exception e)
    {
        Response.Write(e.Message);
    }


}