GraphLibrary/DrawGraph/Export.cs

using System.IO;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Xml;
using System.Windows.Media.Imaging;
using Microsoft.Win32;

namespace DrawGraph
{
    public class Export
    {
        public static void ToPng(Canvas canvas, string path)
        {
            RenderTargetBitmap renderBitmap = new RenderTargetBitmap(
                (int)canvas.Width, (int)canvas.Height,
                96d, 96d, PixelFormats.Pbgra32);
            canvas.Measure(new Size((int)canvas.Width, (int)canvas.Height));
            canvas.Arrange(new Rect(new Size((int)canvas.Width, (int)canvas.Height)));

            renderBitmap.Render(canvas);

            //JpegBitmapEncoder encoder = new JpegBitmapEncoder();
            PngBitmapEncoder encoder = new PngBitmapEncoder();
            encoder.Frames.Add(BitmapFrame.Create(renderBitmap));

            using (FileStream fs = new FileStream(path, FileMode.Create))
            {
                encoder.Save(fs);
            }
        }

        public static void ToJpeg(Canvas canvas, string path)
        {
            RenderTargetBitmap renderBitmap = new RenderTargetBitmap(
                (int)canvas.Width, (int)canvas.Height,
                96d, 96d, PixelFormats.Pbgra32);
            canvas.Measure(new Size((int)canvas.Width, (int)canvas.Height));
            canvas.Arrange(new Rect(new Size((int)canvas.Width, (int)canvas.Height)));

            renderBitmap.Render(canvas);

            JpegBitmapEncoder encoder = new JpegBitmapEncoder();
            encoder.Frames.Add(BitmapFrame.Create(renderBitmap));

            using (FileStream fs = new FileStream(path, FileMode.Create))
            {
                encoder.Save(fs);
            }
        }

        public static void Print(Canvas canvas)
        {
            PrintDialog pd = new PrintDialog();
            if (pd.ShowDialog() == true)
            {
                pd.PrintVisual(canvas, "Printed with DrawGraph");
            }
        }

        public static void ToGraphML(Node[] nodes)
        {
            //<? xml version = "1.0" encoding = "UTF-8" ?>
            //    < graphml xmlns = "http://graphml.graphdrawing.org/xmlns"
            //xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance"
            //xsi: schemaLocation = "http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd" >
            XmlDocument doc = new XmlDocument();
            XmlDeclaration declaration = doc.CreateXmlDeclaration("1.0", "UTF-8", null);
            doc.AppendChild(declaration);
            XmlProcessingInstruction pi =
                doc.CreateProcessingInstruction("graphml", "xmlns=\"http://graphml.graphdrawing.org/xmlns \" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance \" xsi: schemaLocation = \"http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd \"");
            SaveFileDialog sfd = new SaveFileDialog();
            var root = doc.CreateElement("graph");
            foreach (var node in nodes)
            {
                var XNode = doc.CreateElement("node");
            }
            sfd.Filter = "GraphML files (*.graphml)|*.graphml";
            if (sfd.ShowDialog() == true)
            {
                doc.Save(sfd.FileName);
            }
        }
    }
}