// Starts 'chaining' load of customers, orders, orderdetails.
private void LoadCustomers(string name = null)
{
Customers.Clear();
// Either get all customers or filter by name.
if (string.IsNullOrEmpty(name))
{
context.Load(context.GetCustomersQuery(), GetCustomersQueryCallback, true);
}
else
{
context.Load(context.FindCustomersQuery(name), GetCustomersQueryCallback, true);
}
}
/// <summary>
/// Gets order statistics. Asynch call.
/// </summary>
/// <param name="callback">Callback function.</param>
/// <param name="year"></param>
public void GetOrderStatistics(Action <List <OrderStatistics> > callback, int year)
{
var context = new ActionDomainContext();
_orders = context.Orders;
_callback = callback;
context.Load(context.GetOrdersByYearQuery(year), GetOrdersByYearCallback, true);
}
/// <summary>
/// Constructor of Customer ViewModel
/// </summary>
public CustomerViewModel()
{
if (DesignerProperties.IsInDesignTool)
{
return;
}
// init commands.
_addCommand = new RelayCommand(OnAdd);
_editCommand = new RelayCommand(OnEdit);
_deleteCommand = new RelayCommand(OnDelete);
_saveCommand = new RelayCommand(OnSave);
_cancelCommand = new RelayCommand(OnCancel);
UpdateState(false);
RaiseEvent(Loading);
// Load customers from database
context = new ActionDomainContext();
Customers = context.Customers; // important.
context.Load(context.GetCustomersQuery(), GetCustomersQueryCallback, true);
}
