maui-devexpress-dot-maui-dot-collectionview-dot-dxcollectionview-f8a18f99.md
Allows you to validate data item values before they are committed to the data source.
Namespace : DevExpress.Maui.CollectionView
Assembly : DevExpress.Maui.CollectionView.dll
NuGet Package : DevExpress.Maui.CollectionView
public event EventHandler<ValidateItemEventArgs> ValidateAndSave
The ValidateAndSave event's data class is ValidateItemEventArgs. The following properties provide information specific to this event:
| Property | Description |
|---|---|
| AutoUpdateItemsSource | Gets or sets whether the data source associated with the validation context updates automatically when the validation is successful. This is a bindable property. |
| Context | Gets the context or metadata associated with the validation event. |
| DataChangeType | Gets the type of changed data. |
| IsValid | Gets or sets whether the item is valid. This is a bindable property. |
| IsValidAsync | Gets or sets whether the validated item meets the criteria. This is a bindable property. |
| Item | Gets the item validated in the event. |
| SourceIndex | Gets the index of the validated item in the data source. |
The event data class exposes the following methods:
| Method | Description |
|---|---|
| ForceUpdateItemsSource() | Updates the item data source to reflect any changes during validation. |
The DXCollectionView runs validation mechanisms after a user taps the Save button in the edit form in a built-in detail form or after you call the DetailEditFormViewModel.SaveAsync() method for a custom form.
See Also