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If more items could be returned by the query than are present in the result set, continuation tokens will be provided to allow you to retrieve the next set of data in the query. This method of using continuation tokens effectively provides a method of paging. If you wanted to return all items in the Shirts partition of the Products table, but it potentially contains more than 1,000 items, you could run the following REST API query:

[EditorBrowsable(EditorBrowsableState.Advanced)] protected virtual void OnChildChanged( object source, PropertyChangedEventArgs propertyArgs, ListChangedEventArgs listArgs) { Csla.Core.ChildChangedEventArgs args = new Csla.Core.ChildChangedEventArgs(source, propertyArgs, listArgs); if (_childChangedHandlers != null) _childChangedHandlers.Invoke(this, args); } This method uses the provided parameter values to create an instance of ChildChangedEventArgs, which is then used to raise the ChildChanged event. The event itself is declared using the custom event declaration form: [NonSerialized] [NotUndoable] private EventHandler<Csla.Core.ChildChangedEventArgs> _childChangedHandlers; public event EventHandler<Csla.Core.ChildChangedEventArgs> ChildChanged { add { _childChangedHandlers = (EventHandler<Csla.Core.ChildChangedEventArgs>) System.Delegate.Combine(_childChangedHandlers, value); } remove { _childChangedHandlers = (EventHandler<Csla.Core.ChildChangedEventArgs>) System.Delegate.Remove(_childChangedHandlers, value); } } This is substantially more code than a simple event declaration such as this: public event EventHandler<Csla.Core.ChildChangedEventArgs> ChildChanged; The reason for all the extra code is that the backing field for the event needs to be marked as NonSerialized and NotUndoable. All events on a Serializable object must be marked with NonSerialized. Failure to do this will result in serialization errors if the event is being handled by a nonserializable object such as a WPF Form or a Windows Forms Form or a Web Forms Page object. Similarly, any event declared in an undoable object (one that inherits from UndoableBase or implements IUndoableObject as discussed in 13) must mark the backing field as NotUndoable. Failure to do this will result in undo errors during data binding. This long form for declaring events allows explicit declaration of the backing field (which is otherwise autogenerated by the compiler): [NonSerialized] [NotUndoable] private EventHandler<Csla.Core.ChildChangedEventArgs> _childChangedHandlers;

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The ICloneable interface is implemented as well. The Clone() method for the interface itself is accessible only via the interface. There s also a public strongly typed method that returns an object of type T. Both of these methods delegate to a virtual method named GetClone(), which in turn delegates to Csla.Core.ObjectCloner to do the actual work. Again, this is the same code as in BusinessBase and BusinessListBase, so I won t repeat it here. This completes the ReadOnlyBase class. The chapter will wrap up by covering ReadOnlyListBase.

http://silverlightukstorage.table.core.windows.net/Products $filter =PartitionKey%20eq %20'Shirts'

Like the ReadOnlyBase class, ReadOnlyListBase is quite simple to create. It is designed to make it easy for a business developer to create a business collection that doesn t allow items to be added or removed. Presumably, it will be used to contain read-only child objects, but any type of child object is allowed. The Csla.Core.ReadOnlyBindingList class implemented earlier in the chapter already handles all the details, except for implementing ICloneable and data access. The data access code will be added in 4, so only the ICloneable functionality will be added here. The ReadOnlyListBase class is defined like this: [Serializable()] public abstract class ReadOnlyListBase<T, C> : Core.ReadOnlyBindingList<C>, Csla.Core.IReadOnlyCollection, ICloneable where T : ReadOnlyListBase<T, C> { } Like BusinessListBase, it accepts two generic type parameters. Type T is constrained to be a subclass of this base class and refers to the type of the collection being created. Type C is the type of the child object to be contained within the collection, and it can be any type. Again, it would make the most sense for the child type to be some form of read-only object, but that s not required by the collection class. A business collection would be declared like this:

Because more than 1,000 items would normally be returned in the query, you ll receive the following continuation tokens in the response:

This declares a delegate field to manage the event handler references and is normally done by the compiler. However, since this code is explicit, the declaration can be decorated with the NonSerialized and NotUndoable attributes. The result is that the ChildChanged event won t cause problems during serialization, n-level undo, or data binding. You should now understand how BusinessBase handles all child PropertyChanged and ListChanged events and raises a ChildChanged event in response.

x-ms-continuation-NextPartitionKey: Shirts x-ms-continuation-NextRowKey: 1001

[Serializable()] public class CustomerList : Csla.ReadOnlyListBase<CustomerList, CustomerInfo> { } This indicates that the collection will be containing child objects of type CustomerInfo.

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