How to: Display a List of Non-Persistent Objects with an Intermediate Container Class and Its Detail View

This example stores a list of books. When a user clicks the Show Duplicate Books action, a popup dialog displays a list of duplicated books and their copy counts. This list is shown with a detail view.

Note: This example uses an intermediate container class to display a list non-persistent objects. In this case, the ObjectsGetting method cannot be applied. If your application logic does not require complex operations to create non-persistent objects, use the ObjectsGetting method. Refer to the following help topic for implementation details: How to: Display a Non-Persistent Object's List View from the Navigation.

Implementation Details

1. Declare the Book persistent class. Objects of this class denote books in a collection.
2. Declare two non-persistent classes—Duplicate to store unique book titles and the total number of books with these titles, and DuplicatesList to aggregate the Duplicate objects.
3. In a controller, implement a method that iterates through persistent Book objects, counts the number of copies of each book, and saves this information in a dictionary.
4. Implement a method that iterates through dictionary items and creates Duplicate objects for items with a value greater than one (books with more than one copy). Add Duplicate objects to a DuplicatesList collection.
5. Add the PopupWindowShowAction to display a popup dialog when a user clicks the Show Duplicate Books action. Handle the CustomizePopupWindowParams event and call the CreateDetailView method to create a Detail View for the DuplicatesList object.

See the following help topic for more detailed information: How to: Display a List of Non-Persistent Objects in a Popup Dialog

Files to Review

• Book.cs
• Duplicate.cs
• ShowDuplicateBooksController.cs

Documentation

• Non-Persistent Objects
• How to: Display a List of Non-Persistent Objects with an Intermediate Container Class and Its Detail View

More Examples

• XAF - How to Implement CRUD Operations for Non-Persistent Objects Stored Remotely
• XAF - How to edit non-persistent objects nested in a persistent object
• XAF - How to filter and sort non-persistent objects
• XAF - How to refresh non-persistent objects and reload nested persistent objects
• XAF - How to edit a collection of persistent objects linked to a non-persistent object

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