Migrating from Version 2.x

Although every attempt was made to prevent breaking interface changes between versions 2.x and 3.0, some were inevitable. This topic lists the most notable changes as well as provides a list of the members that were rendered obsolete.

Behavior Changes

The AutoCreateItemProperties property was added to the DataGridCollectionView and DataGridCollectionViewSource properties with a default value of true; therefore, as of version 3.0, all item properties (i.e., columns) will be added to the grid and not only the ones defined in the ItemProperties collection. Setting the AutoCreateItemProperties to false will revert back to the expected 2.0 behavior.
Because the ValidationMode property was made obsolete and a major overhaul of the validation behavior was done for version 3.0, some validation behaviors may have changed. These can include:
1. The focus no longer remains in a cell when it is in error when the ValidationMode was set to CellEndingEdit.
2. UI validation rules (CellValidationRules) are always validated when a cell exits edit mode or when the new value is updated in the source (see UpdateSourceTrigger property).
3. Errors reported by IDataErrorInfo will now be caught.

Breaking Interface Changes

The AutoFilterValues property is now read-only on the DataGridCollectionView, DataGridContext, and DataGridDetailDescription classes.
The BeginEdit, EndEdit, and CancelEdit methods on the Row and Cell classes are no longer virtual and have been replaced by their virtual BeginEditCore, EndEditCore, and CancelEditCore counterparts.
The Initialize method on the Cell class is no longer virtual and has been replaced by its virtual InitializeCore counterpart.
The Width property on the Column class is now a ColumnWidth value rather than a double.
The EndNew implementation of the ICancelAddNew interface on the DataGridCollectionView is now explicit rather than implicit.
The ICustomItemContainerGenerator interface contains new members that need to be implemented on any classes that implement this interface.
The DropMarkOrientation enumeration has been moved from the Xceed.Wpf.DataGrid namespace to the Xceed.Wpf.DataGrid.Views namespace.
The attached versions of the CardView.CardTitleBackground, CardTitleForeground, CardTitleTemplate, HideEmptyCells, InsertionCardTitleTemplate, and StatCardTitleTemplate properties have been removed as they were not supported.

Obsolete Members

The following table provides a list of the members that were rendered obsolete and their replacement.

Obsolete member	Replacement member	Type
RowSelectorPane.ItemsPlacementReference property	None	Error
RowSelectorPane.RowSelectorStyle attached property	RowSelector.RowSelectorStyle attached property	Error
RowSelectorPane.ScrollViewer property	None	Error
DataGridControl.AddingNewDataItem event	DataGridCollectionView.CreatingNewItem and InitializingNewItem events	Warning
DataGridControl.ItemsPanel property	DataGridItemsHost class	Warning
DataGridControl.ValidationMode property	See Editing and Validating topic	Warning
Column.DisplayMemberBinding property	Column.DisplayMemberBindingInfo property	Warning

Inheritance Changes

The CellCollection class now derives from Collection rather than ObservableCollection.
The GroupConfiguration class now derives from Freezable rather than directly from DependencyObject.
The RowSelectorPane class now derives from Panel rather than Canvas.

What Happened to ActualContent?

The ActualContent property was an internal property. Although binding to it in XAML worked (as long as the application has full trust), it was only a temporary workaround. It was one of our goals for version 3.0 to get rid of ActualContent and to make it so that the Cell's Content property was always "live" with the business object. From now on, the Cell's Content property will always return the current content of the cell.

Let's take the following scenario: If a business object's "quantity" property is set to 10 and you enter edit on a DataGridControl's DataRow to change the "quantity" cell to 20: In version 2.0, the Cell's Content property would still be set to 10 and the internal ActualContent property would be set to 20. With version 3.0, the Cell's Content would now be equal to 20, even if the cell and/or the row is still in edit mode. The business object's "quantity" property will still be equal to 10 until the binding between the cell's Content property and the business object is updated. The moment when this binding updates the source is controlled via the DataGridControl's UpdateSourceTrigger property. Its default value is RowEndingEdit, meaning that each of the row's cells Content will be sequentially pushed to the business object as soon as the row tries to end its edit process.

The other UpdateSourceTriggers are : CellEndingEdit, which means that the cell will push its content to the source as soon as it tries to end its edit process, even if the row is still being edited. CellContentChanged, which means that the cell will push its content to the source as soon as its Content property changes... this could very well mean that it could update your business object at each key stroke made in a cell editor. Therefore, as of version 3.0, all bindings to the ActualContent property must be changed to the Content property instead.

Known Issues

Implicit DataTemplates are no longer detected and must be explicitly assigned to the appropriate column's CellContentTemplate property.