private async Task <Statistics> SynchronizeInternalAsync(IAppointmentSource source, IAppointmentDestination destination, bool force)
{
var sourceAppointments = await source
.LoadAllAppointments()
.ToArrayAsync()
.ConfigureAwait(false);
var destAppointments = await destination
.LoadAllAppointments()
.ToArrayAsync()
.ConfigureAwait(false);
var newAppointments = sourceAppointments.Except(destAppointments, LoadedAppointmentIdComparer.Default);
var deletedAppointments = destAppointments.Except(sourceAppointments, LoadedAppointmentIdComparer.Default);
var modifiedAppointments = sourceAppointments.SmartZip(destAppointments, LoadedAppointmentIdComparer.Default,
(src, dest) => new { Source = src, Destination = dest });
if (!force)
{
modifiedAppointments = modifiedAppointments.Where(pair => pair.Source.LastModifiedDateTime > pair.Destination.LastModifiedDateTime);
}
int created = 0, deleted = 0, updated = 0;
foreach (var appointment in newAppointments)
{
await destination
.CreateAppointmentAsync(appointment.UniqueId, appointment)
.ConfigureAwait(false);
created++;
}
foreach (var appointment in deletedAppointments)
{
await destination
.DeleteAppointmentAsync(appointment)
.ConfigureAwait(false);
deleted++;
}
foreach (var pair in modifiedAppointments)
{
await destination
.UpdateAppointmentAsync(pair.Destination, pair.Source, force)
.ConfigureAwait(false);
updated++;
}
return(new Statistics(created, deleted, updated));
}
private async void ButtonClick(object sender, EventArgs e)
{
_btnLoad.Enabled = false;
try
{
listBox1.Items.Clear();
if (!(_cmbCalendars.SelectedItem is IAppointmentSourceFactory factory))
{
return;
}
using (IAppointmentSource source = await factory.ConnectSourceAsync())
{
await source.LoadAllAppointments()
.ForEachAsync(a => BeginInvoke((Action)(() => listBox1.Items.Add(a))));
}
}
finally
{
_btnLoad.Enabled = true;
}
}