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CHAPTER 6 WORKING WITH DATA
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Notifies the DataServiceContext to start tracking the specified resource and supplies the location of the resource within the specified resource set. Asynchronously sends the request so that this call does not block processing while waiting for the results from the service.
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BeginSaveChanges Asynchronously submits the pending changes to the data service collected by the DataServiceContext since the last time changes were saved. DeleteLink Changes the state of the link to Deleted in the list of links being tracked by the DataServiceContext. Changes the state of the specified object to Deleted in the DataServiceContext. Removes the entity from the list of entities that the DataServiceContext is tracking. Removes the specified link from the list of links being tracked by DataServiceContext. It is called to complete the BeginExecute(T) async call. It is called to complete the BeginSaveChanges operation. This method notifies DataServiceContext that a new link exists between the objects specified and that the link is represented by the property specified by the sourceProperty parameter. Sets a new data stream as the binary property of an entity. This is a new method in Silverlight 4. This method changes the state of the specified object in DataServiceContext to Modified.
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Table 6-8. Key Properties of the System.Data.Services.Client.DataServiceContext Class
Property
ApplyingChanges
Type
bool
Description
Gets a value that indicates whether DataServiceContext is currently applying changes to tracked objects. This is a new property in Silverlight 4. Gets the absolute URI identifying the root of the target WCF Data Service.
BaseUri
CHAPTER 6 WORKING WITH DATA
Credentials
ICredentials
Provides a base authentication interface to retrieve credentials for Web client authentication. This is a new property in Silverlight 4. Defines the XML namespace for data items of a payload in the Atom format. The default value is the default WCF Data Services namespace, http://schemas.microsoft.com/ado/2007/08/dataservices.
DataNamespace
string
Entities
ReadOnlyCollection Gets a list of all the resources currently being tracked by (EntityDescriptor) DataServiceContext. HttpStack Gets a value that indicates the type of HTTP implementation to use when accessing the data service. The default value is Auto, which is used for the HTTP implementation. You can also set to ClientHttp to use Silverlight client HTTP implementation and set to XmlHttp to use XMLHTTP implementation. This is a new property in Silverlight 4. Gets or sets the synchronization option for receiving entities from a data service. Gets or sets the SaveChangesOptions values used by the BeginSaveChanges method. Defines whether to use default credentials of the currently logged-in user (true value) or not (false value).
HttpStack
MergeOption
MergeOption
SaveChanges DefaultOptions
SaveChanges DefaultOptions
UseDefaultCredentials bool
The DataServiceQuery Class
The DataServiceQuery class represents a single query request to a data service. The query can be a LINQ query. As Silverlight allows only asynchronous Web requests, we need to cast this query into a DataServiceQuery<T> object and then explicitly call the BeginExecute method to start the asynchronous execution of the query. You call the EndExecute method to complete the asynchronous operation of executing the query. Table 6-9 shows the properties of this class: Table 6-9. Properties of the System.Data.Services.Client.DataServiceQuery Class
Property
Expression
Type
Expression
Description
Defines an expression that contains the query to the data service. Defines the query provider instance.
Provider
System.Linq.IQueryProvider
CHAPTER 6 WORKING WITH DATA
The DataServiceCollection (T) Class
To support data binding with Silverlight controls using WCF Data Services is a new functionality introduced in Silverlight 4, which can be achieved using the DataServiceCollection(T) class. It represents a dynamic entity collection that provides notifications when items get added or removed, or when the list is refreshed. This class inherits from the ObservableCollection class to automatically update bound data when there are changes to data in bound controls. Using this class you can enable rich two-way data binding by implementing automatic change tracking on client-side objects created using the WCF Data Services client library. Table 6-10 defines the methods of this class: Table 6-10. Methods of the System.Data.Services.Client.DataServiceCollection Class
Method
Add Clear(bool)
Description
Adds a new item to the end of the Collection (T). Removes all elements from the Collection (T) and detaches all items from the DataServiceContext when true is passed. Disables DataServiceContext tracking of all items in the root collection. Loads a single entity object or a collection of entity objects into the collection. Asynchronously loads items into the collection. Loads the next page of data into the collection.
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