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Add, Edit and Delete Operations

This article explains when the add, edit and remove operations of RadDataForm are available. We will cover the operations in the following order:

Overview

To better understand how these operations work, we need to first examine how RadDataForm's source collection is set. RadDataForm’s Source property accepts IEnumerable values and manages them as follows:

  • If the underlying value implements IEditableCollectionView, the current implementation of its methods is used.
  • Otherwise, a new instance of Telerik’s QueryableCollectionView (which implements both aforementioned interfaces) is initialized, using the Source value as its source collection.

Add

RadDataForm's Add operation will be available when one of the following conditions is met:

  • The collection implements the IEditableCollectionView interface

  • The collection is an IList without a fixed size and with a public default constructor

  • The collection implements an Add method and has a public default constructor. The Add method needs to have a single parameter - the object you want to add to your collection.

In any other case, RadDataForm will not be able to add an item and the respective Add button will be disabled.

Figure 1: RadDataForm with disabled Add and Remove buttons

raddataform-crud-operations-1

Remove

Similar to the Add operation, you will be able to remove items in any of the following cases:

  • The collection implements the IEditableCollectionView interface

  • The collection is an IList without a fixed size

  • The collection implements a Remove method with a single parameter - the object to remove from the collection.

Figure 2: RadDataForm with enabled Add and Remove buttons

raddataform-crud-operations-2

Edit

If the current item is not null and RadDataForm is not in editing mode, the Edit button will be enabled and editing functionality will be available.

If the items of the data source implement the IEditableObject or the INotifyPropertyChanged interface, you will be able to revert any pending changes with the Cancel button.

Note that in the latter case, the EnablePropertyChangedBasedCancel property of RadDataForm needs to be set to True.

EnablePropertyChangedBasedCancel is not supported when using custom data templates.

Please note that when an Edit is started, the Navigation and AddNew commands get disabled until the editing operation is committed or cancelled.

For more information on the behaviour of the OK and Cancel buttons, you could check the article on AutoCommit Settings.

RadDataForm supports editing of types that do not implement the IEditableObject or INotifyPropertyChanged interfaces. Still, please note that in this case you cannot take advantage of the cancel edit feature and the Cancel button will not be enabled.

You can find a detailed explanation of how to implement the IEditableObject in this MSDN article.

AutoEdit

The AutoEdit property indicates whether RadDataForm should automatically enter Edit mode when loading or navigating items. The default value is False. If you need to have RadDataForm in Edit mode by default, instead of having to click the Edit button every time you need to edit a record, you can set AutoEdit to True.

Please note that setting AutoEdit to True will disable the Add button and you won't be able to add new entries.

See Also