Professional SharePoint® 2010 Branding and User Interface Design

The Client Object Model

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query on the client context and execute it on the SharePoint server. The ExecuteQueryAsync

method executes all the queries that have been loaded onto the client context asynchro-

nously. Once the SharePoint server is fi nished, it calls back on one of the two callback meth-

ods passed depending on whether the request succeeded or failed. Add the follow code to the

ContactsViewModel.cs fi le to get the list data from SharePoint:

private void PopulateContacts()

{

//Get Data from SharePoint using the Client Object Model

//Get a reference to the current client context

ctx = ClientContext.Current;

//Specify the List and Listitems to return

List contactsList = ctx.Web.Lists.GetByTitle(“Contacts”);

contactsListItems =

contactsList.GetItems(CamlQuery.CreateAllItemsQuery());

//Add query to context and execute it on the server

ctx.Load(contactsListItems);

ctx.ExecuteQueryAsync(ContactsLoaded, ContactsLoadedFail);

}

Figure 14-16 shows what the Contacts list looks like in SharePoint. This is just a normal

SharePoint list that I created using sample data from the AdventureWorks database.

FIGURE 1416

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CHAPTER 14 SILVERLIGHT AND SHAREPOINT INTEGRATION

4. Handle the failed callback. In the ...