Push Notifications in Windows 8: Listing 2

The PushNotifier class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;
using System.Web;
 
namespace VSMWnsPushNotifier
{
    public class PushNotifier
    {
        public enum PushType
        {
            Badge,
            Tile,
            Toast
        };
 
        private string _uri;
        private string _accessToken;
   
        public PushNotifier(string uri, string accessToken)
        {
            _uri = uri;
            _accessToken = accessToken;
        }
 
        public bool SendNotification(PushType pushType, string text,string imageSource)
        {
            bool result = false;
 
            try
            {
                string rawType = "wns/";
                string notificationContent = String.Empty;
 
                switch (pushType)
                {
                    case PushType.Badge:
                        rawType += "badge";
                        notificationContent = String.Format("<?xml version='1.0' encoding='utf-8'?><badge value=\"{0}\"/>", text);
                        break;
                    case PushType.Tile:
                        rawType += "tile";
                        notificationContent = String.Format("<?xml version='1.0' encoding='utf-8'?><tile><visual lang=\"en-US\">
                        <binding template=\"TileWideSmallImageAndText03\"><image id=\"1\" src=\"{0}\"/><text id=\"1\">{1}</text>
                        </binding></visual></tile>", imageSource, text);
                        break;
                    case PushType.Toast:
                        rawType += "toast";
                        notificationContent = String.Format("<?xml version='1.0' encoding='utf-8'?><toast><visual>
                        <binding template=\"ToastImageAndText01\"><image id=\"1\" src=\"{0}\" alt=\"Placeholder image\"/>
                        <text id=\"1\">{1}</text></binding></visual></toast>", imageSource, text);
                        break;
                    default:
                        break;
                }
 
                var subscriptionUri = new Uri(_uri);
                var request = (HttpWebRequest)WebRequest.Create(subscriptionUri);
                request.Method = "POST";
                request.ContentType = "text/xml";
                request.Headers = new WebHeaderCollection();
                request.Headers.Add("X-WNS-Type", rawType);
                request.Headers.Add("Authorization", "Bearer " + _accessToken);
                byte[] notificationMessage = Encoding.Default.GetBytes(notificationContent);
                request.ContentLength = notificationMessage.Length;
 
                using (Stream requestStream = request.GetRequestStream())
                {
                    requestStream.Write(notificationMessage, 0, notificationMessage.Length);
                }
 
                var response = (HttpWebResponse)request.GetResponse();
 
                result = (response.StatusCode == HttpStatusCode.OK);
            }
            catch (Exception)
            {
                result = false;
            }
 
            return result;
        }
    }
}

About the Author

Eric Vogel is a Senior Software Developer for Red Cedar Solutions Group in Okemos, Michigan. He is the president of the Greater Lansing User Group for .NET. Eric enjoys learning about software architecture and craftsmanship, and is always looking for ways to create more robust and testable applications. Contact him at [email protected].

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