XPS を画像形式に変換する

// The path to the documents directory.
string dataDir = RunExamples.GetDataDir_WorkingWithDocumentConversion();
// Input file
string inputFileName = dataDir + "input.xps";
//Outut file 
string outputFileName = dataDir + "XPStoImage_out.png";
// Initialize XPS input stream
using (Stream xpsStream = File.Open(inputFileName, FileMode.Open, FileAccess.Read))
{
    // Load XPS document form the stream
    XpsDocument document = new XpsDocument(xpsStream, new XpsLoadOptions());
    // or load XPS document directly from file. No xpsStream is needed then.
    // XpsDocument document = new XpsDocument(inputFileName, new XpsLoadOptions());

    // Initialize options object with necessary parameters.
    PngSaveOptions options = new PngSaveOptions()
    {
        SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality,
        Resolution = 300,
        PageNumbers = new int[] { 1, 2, 6 }
    };

    // Create rendering device for image
    ImageDevice device = new ImageDevice();

    document.Save(device, options);

    // Iterate through document partitions (fixed documents, in XPS terms)
    for (int i = 0; i < device.Result.Length; i++)
        // Iterate through partition pages
        for (int j = 0; j < device.Result[i].Length; j++)
        {
            // Initialize image output stream
            using (Stream imageStream = System.IO.File.Open(Path.GetDirectoryName(outputFileName) +
                Path.GetFileNameWithoutExtension(outputFileName) + "_" + (i + 1) + "_" + (j + 1) +
                Path.GetExtension(outputFileName), System.IO.FileMode.Create, System.IO.FileAccess.Write))
                // Write image
                imageStream.Write(device.Result[i][j], 0, device.Result[i][j].Length);
        }
}