Silverlight 2.0

1. Silverlight 2.0 Dave Allen ISV Application Architect Developer and Platform Group Microsoft UK

2. Agenda Networking Web Services ADO.NET Data Services WebClient Sockets Isolated Storage File Open Dialog Background processing Host page interaction

3. Web Services Supports WCF or ASMX bascHttpBinding only HTTP or HTTPS GET or POST only 200 and 404 only status codes supported SOAP, POX, JSON, or RSS serialization X-Domain calls require a Policy file All communications have to be asynchronous

4. Demo Silverlight 2.0 Web Services

5. ADO.NET Data Services Data publishing service using a RESTful interface Just uses HTTP Therefore is able to use existing authentication mechanisms, and other infrastructure components such as caching and proxies Uniform URL Syntax Every piece of information is addressable Predictable and flexible URL syntax Multiple representations ATOM JSON POX

6. ADO.NET Data Services (2) Exposes an object model (not a database) over the web Entity Data Model – ADO.NET DS designed to work with EDM LINQ To SQL model, read-only Custom IQueryable<T> provider Operation semantics, mapping of HTTP verbs for CRUD operations GET – retrieve resource POST – create a resource PUT – update a resource DELETE – delete a resource

7. URL Conventions Addressing entities and sets Presentation options

8. Demo Silverlight & ADO.NET Data Services

9. Isolated Storage Ability to interact with local file system Virtual file system supporting single files or a directory of files Limited size based on quota, default to 1Mb Per user, per application or per site/domain Can check quota size or available space Can be increased through user prompt

10. File Open Dialog Prompt users for file names Similar to OpenFileDialog in WinForms Supports file filters, *.jpg, etc. Supports multiple file seclection Only have access to file name, not the path File is read only

11. Demo Isolated Storage and File Open Dialog

12. Background processing Keeps the user interface interactive Useful when operation length is unknown E.g. any outbound network call Fits well with Silverlightasync programming model Spawn a new thread using BackgroundWorker

13. Demo Background processing

14. Host page interaction Two-way communication Call .NET Silverlight methods from JavaScript Call JavaScript funcrtions from Silverlight Pass complex structures between them .NET Code needs to be attributed [ScriptableType] for the class [ScriptableMember] for methods and properties Scriptable code needs to be registered HtmlPage.RegisterScriptableObject(id,this)

15. Host page interaction (2) Types in System.Windows.Browser Start with an HtmlPage Grab an HtmlDocument or HtmlWindow Work with HtmlElement instances Work with DOM and JavaScript types Invoke methods GetProperty and SetProperty types On an HtmlElement GetAttribute and SetAttribute AttachEvent and DetachEvent handlers

16. Demo Host page interaction