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2015-03-08

Merge documents into single PDF file using Apitron PDF Kit library (С# sample)

Introduction


Merging several PDF documents to single PDF file is very common task performed by many applications and Apitron PDF Kit provides very simple and clean API for it. See the code provided in next section in order to quickly get the idea and use it in your own app.


The code


void MergeDocuments()
{
        FixedDocument resultingDocument = new FixedDocument();         

        // let's assume that we have a folder with files which should be merged
        foreach (string fileName in Directory.EnumerateFiles("Documents","*.pdf"))
        {
            // open found document and copy its pages to resulting doc
            using (Stream file = File.OpenRead(fileName))
            {
                FixedDocument pdfDocument = new FixedDocument(file);
                // enumerate pages and save each page as separate PDF file
                for (int i = 0; i < pdfDocument.Pages.Count; i++)
                {
                    // Export page before inserting it into the new document,
                    // it preserves resources used by this page.
                    resultingDocument.Pages.Add(Page.Export(resultingDocument, pdfDocument.Pages[i]));                        
                }
            }
        }
        // save resulting document
        using (Stream outputStream = File.Create("resultingDocument.pdf"))
        {
            resultingDocument.Save(outputStream);
        }               
}

This code searches for pdf files in subdirectory “Documents” and processes each PDF file found by append its pages to the resulting document.

The article describing document splitting can be found in our blog or in Documentation section on our website. You can also find there a complete book with very detailed explanation of many PDF related aspects (see Apitron PDF Kit in Action). Feel free to ask questions, we are always ready to help.

Downloadable version of this article can be found by the following link [PDF].

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