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Introduction To: Client Object Model Development

Introduction To: Client Object Model Development. March 20, 2009 SharePoint Saturday Neil Iversen. http ://justaddcode.com/blog. The Plan. Introduction  You are here SharePoint 2010 Developer Overview. What is the Client Object Model Working with the COM .NET Silverlight

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Introduction To: Client Object Model Development

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  1. Introduction To: Client Object Model Development March 20, 2009 SharePoint Saturday Neil Iversen http://justaddcode.com/blog

  2. The Plan • Introduction  You are here • SharePoint 2010 Developer Overview

  3. What is the Client Object Model • Working with the COM • .NET • Silverlight • Javascript • Questions

  4. What’s a Client Object Model? • Run code against SharePoint…only remotely • Its like a Web Service call, only prettier • Why use it? • ‘No Code’ solutions • Fancy AJAX • Rich Internet Applications (RIA) • Integrate with WinForm/WPF Apps • (Potentially) Get around Solution Limits

  5. So, how’s it work? • You use its .dll/.js • It bundles your calls • It calls a web service • You get pretty objects back

  6. Client Object ModelRuns on Remote Machine • Simple API to Add, Retrieve, Updateand Manage Data in SharePoint • Commands batched for Performance SharePoint Data Consistent Efficient Client Application .NET CLR Silverlight CLR JavaScript

  7. What’s the big advantage? • Uses calls similar to the Server Object Model (aka ‘The Object Model’ • Compared to the eye-blinding XML for the web services

  8. Getting Started – Where Am I? • ClientContext • Sets up the Environment your calls will be in • The Web you’ll be working with • Web and SilverLight have a Current context • .NET Requires you to specify a location • AuthenticationMode • Uses currently logged in User by default • Set to FormsAuth • Example: clientContext= new ClientContext(“http://myurl”); • web = clientContext.Web;

  9. Retrieving Items • Item Collections can be retrieved by ‘calling’ them • web.Lists • LINQ is available for some objects • var query = from l in web.Lists where l.Title = “Tasks” • Not everything is Enumerable • There is no list.Items • CAML is preferred for ListItems • CamlQuery object

  10. Nothing Happened! • Everything is async • Nothing happens until you clientContext.ExecuteQuery • But first you need to tell it the objects to Load • clientContext.Load(lists)

  11. Know when to Load them • Two methods for getting data: Load and LoadQuery • Load • Loads an instance of an object • LoadQuery • Returns a collection of objects • Can return multiple levels of objects (parent.child.child) • Can be more memory efficient

  12. Why can’t I see all my fields? • SharePoint is trying to conserve resources • It only brings back what it has to • Use Include to override this behavior • Load(myLists, lists=>lists.Include(list =>list.Title,list=>list.Author) • Or • Load(myLists, “Include(Title,Author)”)

  13. Demo - .NET Client Object Model

  14. Adding a new Item • ListItemCreationInformation • Sets the context for the Add • collection.Add(listItemCreationInformation) • Returns Item • Ex: ListItem item = list.Add(lici) • Then • item.Update() • clientContext.ExecuteQuery()

  15. Updating an Item • Item.Update! • clientContext.ExecuteQuery()

  16. Deleteing an Item • Item.DeleteObject • clientContext.ExecuteQuery()

  17. Demo - .NET CRUD

  18. ECMAScript Object Model • Commonly called ‘javascript’ by humans • Requires: • MSIE 7+ • Firefox 3.5+ • Safari 4.0+ • Needs SP.js to be loaded • <SharePoint:ScriptLinkrunat="server" Name="sp.js" Localizable="false" LoadAfterUI="true" /> • Stored in /LAYOUTS • SP.js – SP.debug.js

  19. Async what? • Javascript and SilverLight only have async web calls • This means you’ll get your results…sometime • Line 1 • WS Call • Line 3 • Line 1 • WS Call • Line 3

  20. Demo – Javascript Demo

  21. SilverLight • Probably the funnest of the options • Give you rich visualization options • Has Client Object Model like JS/.NET

  22. Demo – SilverLight Demo

  23. How about something you can use? • Auto Complete a list item • We’ll use jQuery and a plugin conveniently called ‘autocomplete’ • 3 Components • Get the Context, List and run the ‘All Item’s query • Bind the Autocomplete Data • Bind the Result Action

  24. Demo – Autocomplete Demo

  25. A Note about WP7 • Currently the SilverLight Client Object Model doesn’t run against WP7 • WP7 currently doesn’t support Active Directory authentication with Web services • Forms Authentication is currently the only way to access SP content from the phone

  26. Questions?

  27. Thanks! Neil Iversen Inetium http://justaddcode.com

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