WPF Data Grid - Implement an Edit Cell Confirmation

This example demonstrates how to invoke a confirmation dialog that allows users to apply or discard changes made in a cell.

Handle the GridViewBase.ValidateCell event (raised before the modified value is posted to the cell) and display a MessageBox with a confirmation message. If a user clicks No, call the DataViewBase.HideEditor method to discard changes.

Implementation Details

You can implement a custom attached behavior to interact with events and methods of a UI element (TableView in this example) according to the MVVM pattern:

<dxg:GridControl.View>
    <dxg:TableView>
        <dxmvvm:Interaction.Behaviors>
            <local:EditCellConfirmationBehavior/>
        </dxmvvm:Interaction.Behaviors>
    </dxg:TableView>
</dxg:GridControl.View>

public class EditCellConfirmationBehavior : Behavior<TableView> {
    protected override void OnAttached() {
        base.OnAttached();
        AssociatedObject.ValidateCell += AssociatedObject_ValidateCell;
    }
    private void AssociatedObject_ValidateCell(object sender, GridCellValidationEventArgs e) {
        if (e.Column.FieldName == nameof(Item.Growth) &&
            MessageBox.Show("Do you wish to update the value?", "Confirmation", MessageBoxButton.YesNo) ==
            MessageBoxResult.No) {
            AssociatedObject.HideEditor();
        }
    }
    protected override void OnDetaching() {
        AssociatedObject.ValidateCell -= AssociatedObject_ValidateCell;
        base.OnDetaching();
    }
}

Files to Review

• MainWindow.xaml (VB: MainWindow.xaml)
• MainViewModel.cs (VB: MainViewModel.vb)
• EditCellConfirmationBehavior.cs (VB: EditCellConfirmationBehavior.vb)

Documentation

• ValidateCell
• HideEditor()
• Cell Validation
• Create a Custom Behavior

More Examples

• WPF Data Grid - Validate Cell Editors

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