More Saving Options
If the provider implements IUpdatable, ADO.NET Data Services also
supports adding and deleting single objects or object graphs. You add an
object by creating an instance of the entity and using the context’s
AddTo[EntitySetName] method for the corresponding entity set.
Then you can execute the context’s BeginSaveChanges method to apply the changes
and add the new entities to the underlying data source through ADO.NET
Data Services. You can handle deletes by passing the object to delete to
the context’s DeleteObject method.
Then you can execute the context’s BeginSaveChanges method to apply the deletions
through ADO.NET Data Services.
Inserts and Object Graphs
The DeepInsert user control
in the sample code in the EFDataServices solution creates a series of
related objects, links them together in an object graph, and adds them
to the context. Then the object graph is saved via the data service.
The DeepInsertTest method shown in
Example 11-26 creates two Product instances and creates a new Category and Supplier instance for the new Product instances. The new Category and Supplier instances are linked to the new products
using the context’s SetLink method.
Finally, the object graph is passed to the data service through the
context’s BeginSaveChanges
method.
Example 11-26. Deep insert of an object graph
C# private void DeepInsertTest() { Supplier sockSupplier = new Supplier { Address = "1 Lois Lane", City = "Somewhere", CompanyName = "Socks R Us", ContactName = "Ella", ...Get Data-Driven Services with Silverlight 2 now with the O’Reilly learning platform.
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