public async Task Update(Customer customer, int customerId)
{
await Task.Factory.StartNew(() =>
{
try
{
BeginProcessing(customerId);
}
catch (InvalidOperationException ex)
{
GenerateMessage(ex.Message);
return;
}
GenerateMessage("Connecting to server . . .");
Thread.Sleep(500);
GenerateMessage("Updating customer . . .");
Thread.Sleep(4000);
var customerToUpdate = Customers.FirstOrDefault(c => c.Id == customerId);
if (customerToUpdate == null)
{
GenerateMessage($"Customer ID = {customerId} not found");
}
else
{
customerToUpdate.FirstName = customer.FirstName;
customerToUpdate.LastName = customer.LastName;
customerToUpdate.Age = customer.Age;
DatasourceChanged?.Invoke(this, Customers);
GenerateMessage($"Customer ID = {customerId} has been updated");
}
EndProcessing(customerId);
});
}
private void _customers_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
DatasourceChanged?.Invoke(this, Customers);
}
protected virtual void OnDatasourceChanged()
{
DatasourceChanged?.Invoke(this, EventArgs.Empty);
}