private async void OnOpenDetailView(OpenDetailViewEventArgs args)
{
var detailViewModel = DetailViewModels.SingleOrDefault(vm => vm.Id == args.Id &&
vm.GetType().Name == args.ViewModelName);
if (detailViewModel == null)
{
detailViewModel = _detailViewModelCreator[args.ViewModelName];
try
{
await detailViewModel.LoadAsync(args.Id);
}
catch
{
await _messageDialogService.ShowInfoAsync("Could not load entity, " +
"maybe it was deleted in the meantime by another user, " +
"Navigation will be refreshed for you.");
await NavigationViewModel.LoadAsync();
return;
}
DetailViewModels.Add(detailViewModel);
}
SelectedDetailViewModel = detailViewModel;
}
protected async Task SaveWithOptimistcConcurencyAsync(Func <Task> saveFunc, Action afterSaveAction)
{
try
{
await saveFunc();
}
catch (DbUpdateConcurrencyException ex)
{
var databaseValues = ex.Entries.Single().GetDatabaseValues();
if (databaseValues == null)
{
await MessageDialogService.ShowInfoAsync("The entity has been deleted by someone else");
RaiseDetailDeletedEvent(Id);
return;
}
var result = await MessageDialogService.ShowOkCancelDialogAsync("The entity has been changed in" +
"the meantime by someone else. Click Ok to save your changes anyway, orclick Cancel " +
"to reload entity from database", "Question");
if (result == MessageDialogResult.OK)
{
//Update Original values with database values
var entry = ex.Entries.Single();
entry.OriginalValues.SetValues(entry.GetDatabaseValues());
await saveFunc();
}
else
{
await ex.Entries.Single().ReloadAsync();
await LoadAsync(Id);
}
}
afterSaveAction();
}
