private async void OnSave(object sender, EventArgs e)
{
var eve = BindingContext as Event;
if (String.IsNullOrWhiteSpace(eve.Label))
{
await DisplayAlert("Error", "Please enter the label.", "OK");
return;
}
if (eve.StartDate > eve.EndDate)
{
await DisplayAlert("Error", "Please enter correct dates.", "OK");
return;
}
if (eve.Id == 0)
{
await _connection.InsertAsync(eve);
EventAdded?.Invoke(this, eve);
}
else
{
EventUpdated?.Invoke(this, eve);
}
await Navigation.PopAsync();
}
/// <summary>
/// Store the given event
/// </summary>
internal static async Task StoreEvent(CounterEvent counterEvent)
{
using (var conn = new SqlConnection("Server=localhost;Database=EventStore;Trusted_Connection=True;"))
{
using (var comm = conn.CreateCommand())
{
comm.CommandText = "INSERT INTO EventLog (EntityType, EntityId, Version, EventType, Payload) VALUES ('Counter', @EntityId, @Version, @EventType, @Payload)";
comm.Parameters.AddWithValue("@EntityID", counterEvent.Id.ToGuid());
comm.Parameters.AddWithValue("@Version", Convert.ToInt64(counterEvent.Version));
comm.Parameters.AddWithValue("@EventType", counterEvent.EventCase.ToString());
comm.Parameters.AddWithValue("@Payload", counterEvent.GetEventPayload().ToByteArray());
await conn.OpenAsync().ConfigureAwait(false);
try
{
await comm.ExecuteNonQueryAsync().ConfigureAwait(false);
EventAdded?.Invoke(new object(), EventArgs.Empty);
}
catch (SqlException ex) when(ex.Number == 2627)
{
throw new CounterOutOfDateException();
}
}
}
}
private void AddEvent(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter)
{
EventAdded.Focus();
MemberAdded(sender, null);
}
}
private void EventsContexChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
EventAdded?.Invoke(this, new EventArgs());
}
else if (e.Action == NotifyCollectionChangedAction.Remove)
{
EventDeleted?.Invoke(this, new EventArgs());
}
}
private void CollectionEventsChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
EventAdded?.Invoke(this, e);
}
if (e.Action == NotifyCollectionChangedAction.Remove)
{
EventRemoved?.Invoke(this, e);
}
}
protected virtual void EventAddedToQueue()
{
EventAdded?.Invoke(this, EventArgs.Empty);
}
private void TriggerEventAdded(EventData eventData)
{
EventAdded?.Invoke(this, null);
}
private void OnEventAdded(object sender) => EventAdded?.Invoke(sender, EventArgs.Empty);
protected virtual void OnEventAdded(EventSourcingArgs <T, TKey> e)
{
EventAdded?.Invoke(this, e);
}
