Merge or Combine XPS Files Programmatically in C# .NET

readme.md

You can find more details at: Merge XPS Files Programmatically in C#

Merge XPS Advanced.cs

// Initialize PDF output stream
using (Stream pdfStream = File.Open("mergedXPSfiles.pdf", FileMode.Create, FileAccess.Write))
// Initialize XPS input stream
using (Stream xpsStream = File.Open("input.xps", FileMode.Open, FileAccess.Read))
{
    // Load the first XPS document from the stream
    XpsDocument document = new XpsDocument(xpsStream, new XpsLoadOptions());

    // Initialize options object with necessary parameters.
    PdfSaveOptions options = new PdfSaveOptions()
    {
        JpegQualityLevel = 100,
        ImageCompression = Aspose.Page.XPS.Presentation.Pdf.PdfImageCompression.Jpeg,
        TextCompression = Aspose.Page.XPS.Presentation.Pdf.PdfTextCompression.Flate
    };

    // Create rendering device for PDF format
    PdfDevice device = new PdfDevice(pdfStream);

    // Create an array of XPS files that will be merged with the first one
    string[] filesToMerge = new string[] { "input2.xps", "input3.xps" };

    // Merge XPS files to output PDF document
    document.Merge(filesToMerge, device, options);
}

Merge XPS into XPS.cs

// Initialize XPS output stream
using (System.IO.Stream outStream = System.IO.File.Open("mergedXPSfiles.xps", System.IO.FileMode.Create, System.IO.FileAccess.Write))
{
    // Load XPS document
    XpsDocument document = new XpsDocument("input.xps", new XpsLoadOptions());

    // Create an array of XPS files that will be merged with the first one
    string[] filesToMerge = new string[] { "input2.xps", "input3.xps" };

    // Merge XPS files to output XPS document
    document.Merge(filesToMerge, outStream);
}

Merge XPS.cs

// Initialize PDF output stream
using (Stream pdfStream = File.Open("mergedXPSfiles.pdf", FileMode.Create, FileAccess.Write))
// Initialize XPS input stream
using (Stream xpsStream = File.Open("input.xps", FileMode.Open, FileAccess.Read))
{
    // Load the first XPS document from the stream
    XpsDocument document = new XpsDocument(xpsStream, new XpsLoadOptions());

    // Create rendering device for PDF format
    PdfDevice device = new PdfDevice(pdfStream);

    // Create an array of XPS files that will be merged with the first one
    string[] filesToMerge = new string[] { "input2.xps", "input3.xps" };

    // Merge XPS files to output PDF document
    document.Merge(filesToMerge, device, new PdfSaveOptions());
}