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Devexpress xamarin form designer8/9/2023 ![]() ![]() ![]() You can validate input data at the level of the DataFormView used to build detail forms. Var itemsSource = (ObservableCollection)collectionView.ItemsSource ![]() Void OnValidateAndSave(object sender, ValidateItemEventArgs e) Ĭontext.Entry(issue).State = EntityState.Deleted Īwait ("Error when saving changes", exception.Message, "OK") The following example shows an alert message if a user did not fill out the Name and Phone text boxes on the form: ![]() You can also set IsValid to false manually to prevent committing source item values to the source. If the CollectionView does not manage to commit item changes to the data source, the ValidateItemEventArgs.IsValid property is set to false. The CollectionView runs validation mechanisms after a user taps the Save button in the edit form of a built-in detail form, or after you call the DetailEditFormViewModel.Save() method for a custom form. Handle the ValidateAndSave event to validate input values and commit them to the data source. This allows you to keep database constraints and ensure that the database update does not fail because of a bad internet connection. Validate Data at the Source LevelĬollectionView exposes APIs to help you validate data before it is locally saved at the database level. This topic explains different techniques you can use to validate input data values. ![]()
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