// When Delete button is pressed
private async void OnDeleteEntity() {
var messageDialog = new MessageDialog("Delete this Entity?", "Delete confirmation");
messageDialog.Commands.Add(new UICommand("Cancel", (command) =>
{
}));
messageDialog.Commands.Add(new UICommand("Delete", async (command) =>
{
try {
LoadingData = true;
CrudResult = await _entityRepository.DeleteEntityAsync(SelectedEntity.Id);
_eventAggregator.GetEvent<EntityDeletedEvent>().Publish(SelectedEntity);
}
catch (HttpRequestException ex) {
ErrorMessageTitle = ErrorMessagesHelper.DeleteEntityFailedError;
ErrorMessage = ex.Message;
}
finally {
LoadingData = false;
RunAllCanExecute();
_navService.GoBack();
}
}));
messageDialog.DefaultCommandIndex = 0;
await messageDialog.ShowAsync();
if (ErrorMessage != null && ErrorMessage != string.Empty) {
messageDialog = new MessageDialog(ErrorMessage, ErrorMessageTitle);
await messageDialog.ShowAsync();
_navService.GoBack();
}
}
public async override void OnNavigatedTo(object navigationParameter, Windows.UI.Xaml.Navigation.NavigationMode navigationMode, Dictionary<string, object> viewModelState) {
base.OnNavigatedTo(navigationParameter, navigationMode, viewModelState);
// Note: Each time app selects from main page (EntityListPage) detail page (EntityDetailPage) is recreated.
// Meaning that constructor is run and SelectedEntity is null.
// If SuspendAndTerminate (e.g. debug mode) SelectedEntity is saved to SessionState (because of [RestorableState] attribute).
// Therefore, if SelectedEntity has been saved, use it instead of doing GetEntityAsync.
if (SelectedEntity == null) {
string errorMessage = string.Empty;
int entityId = (int)navigationParameter;
if (entityId == 0) {
SelectedEntity = new Entity();
SelectedEntity.ValidateProperties();
RunAllCanExecute();
}
else {
try {
LoadingData = true;
CrudResult = await _entityRepository.GetEntityAsync(entityId);
SelectedEntity = JsonConvert.DeserializeObject<List<Entity>>(CrudResult.Content.ToString()).FirstOrDefault<Entity>();
}
catch (HttpRequestException ex) {
ErrorMessageTitle = ErrorMessagesHelper.HttpRequestExceptionError;
//TODO: Log stack trace to database here
ErrorMessage = string.Format("{0}", ex.Message);
}
finally {
LoadingData = false;
}
if (ErrorMessage != null && ErrorMessage != string.Empty) {
MessageDialog messageDialog = new MessageDialog(ErrorMessage, ErrorMessageTitle);
await messageDialog.ShowAsync();
_navService.GoBack();
}
}
}
RunAllCanExecute();
}
// When Update button is pressed
private async void OnUpdateEntity() {
string errorMessage = string.Empty;
bool isCreating = false;
SelectedEntity.ValidateProperties();
var updateErrors = SelectedEntity.GetAllErrors().Values.SelectMany(pc => pc).ToList();
if (updateErrors.Count == 0) {
try {
LoadingData = true;
if (SelectedEntity.Id == 0) {
isCreating = true;
CrudResult = await _entityRepository.CreateEntityAsync(SelectedEntity);
SelectedEntity = JsonConvert.DeserializeObject<List<Entity>>(CrudResult.Content.ToString()).FirstOrDefault<Entity>();
}
else {
CrudResult = await _entityRepository.UpdateEntityAsync(SelectedEntity);
}
}
catch (ModelValidationException mvex) {
// there were server-side validation errors
DisplayEntityErrorMessages(mvex.ValidationResult);
}
catch (HttpRequestException ex) {
ErrorMessageTitle = isCreating ? ErrorMessagesHelper.CreateEntityFailedError : ErrorMessagesHelper.UpdateEntityFailedError;
ErrorMessage = ex.Message;
}
finally {
LoadingData = false;
RunAllCanExecute();
}
if (ErrorMessage != null && ErrorMessage != string.Empty) {
MessageDialog messageDialog = new MessageDialog(ErrorMessage, ErrorMessageTitle);
await messageDialog.ShowAsync();
_navService.GoBack();
}
}
else {
RunAllCanExecute();
}
}