Silverlight 2 has rich networking support SOAP/XML Web services via WCF proxies Untyped HTTP services (REST, RSS, ATOM) via HttpWebRequest and WebClient.

Silverlight, RIA & Interop

Les communications en Silverlight

Stève SfartzArchitecte Microsoft France

http://blog.sfartz.comhttp://blogs.msdn.com/ssfartz http://blogs.msdn.com/cloud_computing http://blogs.msdn.com/silverlight_plus_java

Networking

• Silverlight 2 has rich networking support• SOAP/XML Web services via WCF

proxies• Untyped HTTP services (REST, RSS,

ATOM) via HttpWebRequest and WebClient

• Socket support, asset downloads over HTTP, syndication classes, and more

• Also supports WCF duplex services and ADO.NET data services ("Astoria")

Downloading Binary Assets

WebClient wc = new WebClient(); wc.DownloadProgressChanged += new DownloadProgressChangedEventHandler(OnProgressChanged); wc.OpenReadCompleted += new OpenReadCompletedEventHandler(OnDownloadCompleted); wc.OpenReadAsync(new Uri("Assets/Flight.wmv", UriKind.Relative)); ... void OnDownloadCompleted(object sender, OpenReadCompletedEventArgs e) { Stream result = e.Result; // TODO: Use result }

Downloading RSS

WebClient wc = new WebClient(); wc.OpenReadCompleted += new OpenReadCompletedEventHandler(OnDownloadCompleted); wc.OpenReadAsync(new Uri ("http://feeds.feedburner.com/AbcNews_TopStories")); ... void OnDownloadCompleted(object sender, OpenReadCompletedEventArgs e) { using (XmlReader reader = XmlReader.Create(e.Result)) { SyndicationFeed feed = SyndicationFeed.Load(reader); RssLB.ItemsSource = feed.Items; // Bind to ListBox } }

Calling a REST Service

HttpWebRequest request = (HttpWebRequest) HttpWebRequest.Create (new Uri("http://contoso.com/weather/98052")); request.BeginGetResponse (new AsyncCallback(OnGetResponseCompleted), request); ... private void OnGetResponseCompleted(IAsyncResult ar) { HttpWebRequest request = (HttpWebRequest)ar.AsyncState; HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(ar);

using (StreamReader reader = new StreamReader(response.GetResponseStream())) { string result = reader.ReadToEnd(); ... } }

WCF Duplex Services

• Silverlight can integrate with WCF duplex services to implement push model for data• Client transmits Net Duplex request

to initiate connection• Server uses WS-Make Connection to

open callback channel for transmitting data

• Client "listens" on callback channelhttp://petermcg.wordpress.com/2008/09/03/silverlight-polling-duplex-part-1-architecture/

Sockets

• Silverlight supports socket connections• System.Net.Sockets.Socket class• Policy file required even for same domain• Connection must be made from client

• Restrictions• Ports 4502-4532 only• Host identified by host name, not IP• TCP only (no UDP)

O’Reilly – Janvier 2009

Data binding controls, LINQ data querying, RESTful and WCF

interfaces, Cross-domain data, ADO.NET Data Services

and the ADO.NET Entity Framework.

Chapitre 8 en teaserConsuming Amazon's RESTful Services with Silverlight 2

Ressources

A Cup of Silverlight http://blogs.msdn.com/silverlight_plus_java

Silverlight & Java Interop http://www.infoq.com/articles/silverlight-java-interop

HTTP Communication and Security with Silverlight http://msdn.microsoft.com/en-us/library/cc838250(VS

.95).aspx

Data-Driven Services with Silverlight 2 http://silverlight2data.com/

Questions ?