Combine multiple notification XMLs in to one payload for pinned tiles

combineNotifications.cs

using DomXmlDocument = Windows.Data.Xml.Dom.XmlDocument;

private static DomXmlDocument CombineNotifications(List<XDocument> notificationXmlsToReturn)
{
    // Per https://msdn.microsoft.com/en-us/library/windows/apps/xaml/hh868253.aspx#include_both_a_square_and_wide_notification_in_the_payload
    // Make the 'binding' elements in each siblings in the new one
    var notificationXmlDocument = notificationXmlsToReturn.FirstOrDefault()?.ToDomXmlDocument();
    if (notificationXmlDocument != null)
    {
        var visualTag = notificationXmlDocument.GetElementsByTagName("visual").SingleOrDefault();
        if (visualTag != null)
        {
            foreach (var otherXmls in notificationXmlsToReturn.Skip(1).Select(n => n.ToDomXmlDocument()))
            {
                var nodeToAdd = notificationXmlDocument.ImportNode(
                    otherXmls.GetElementsByTagName("binding").Single(), true);
                visualTag.AppendChild(nodeToAdd);
            }
        }
    }

    return notificationXmlDocument;
}

public static DomXmlDocument ToDomXmlDocument(this XDocument xDocument)
{
    var xmlDocument = new DomXmlDocument();
    xmlDocument.LoadXml(xDocument.ToString());
    return xmlDocument;
}

public static XDocument ToXDocument(this DomXmlDocument xmlDocument)
{
    using (var memStream = new MemoryStream())
    {
        using (var w = XmlWriter.Create(memStream))
        {
            w.WriteRaw(xmlDocument.GetXml());
        }
        memStream.Seek(0, SeekOrigin.Begin);
        using (var r = XmlReader.Create(memStream))
        {
            return XDocument.Load(r);
        }
    }
}