Merge Docs from Bytes #311
Description
Resources
Examples proved in previous doc site used to work and match this method, new doc site does not have this example.
Reporting an Issue Here
Expected Behavior
Combined PDFs from Memory Stream output a concatenated / merged file.
Actual Behavior
Using this method, I get the a repeat of the first doc for every page in outputDoc. The imported files are stamped and flattened docs from memory streams. The imported files output correctly individually (although a much larger file size for some reason). This seems to be all versions 6 and above. I've tried variations of this method with doc.Pages[i].Clone(), etc. with variations in success.
/// <summary>
/// Merges multiple pdfs into a single document
/// </summary>
/// <param name="files">list of pdf documents as byte arrays</param>
/// <returns>byte array of the combined pdf</returns>
/// <remarks>Flattening will not work after merging</remarks>
public static byte[] MergePdfs(IEnumerable<byte[]> files)
{
byte[] merged;
PdfDocument outputDoc = new PdfDocument();
foreach (byte[] file in files)
{
using (MemoryStream output = new MemoryStream(file, 0, file.Length))
{
using (PdfDocument doc = PdfReader.Open(output, PdfDocumentOpenMode.Import))
{
outputDoc.Version = doc.Version;
for (int i = 0; i < doc.PageCount; i++)
{
PdfPage page = doc.Pages[i];
page.Size = PageSize.Letter;
outputDoc.AddPage(page);
}
}
}
}
using (MemoryStream output = new MemoryStream())
{
outputDoc.Save(output, false);
output.Seek(0, SeekOrigin.Begin);
merged = output.ToArray();
try
{
outputDoc.Close();
}
catch (Exception) { }
}
return merged;
}