public void CanExecuteHandlerBasicTest()
{
using (var dispatcher = new TestDispatcherContext())
{
DispatcherHelper.UIDispatcher = dispatcher.Dispatcher;
var handlerResultList = new List<string>();
var command = new ViewModelCommand(() => { }, () => true);
EventHandler handler1 = (sender, e) => handlerResultList.Add("Handler1");
EventHandler handler2 = (sender, e) => handlerResultList.Add("Handler2");
EventHandler handler3 = (sender, e) => handlerResultList.Add("Handler3");
command.CanExecuteChanged += handler1;
command.CanExecuteChanged += handler2;
command.CanExecuteChanged += handler3;
command.RaiseCanExecuteChanged();
System.Threading.Thread.Sleep(1000);
handlerResultList.Count.Is(3);
handlerResultList[0].Is("Handler1");
handlerResultList[1].Is("Handler2");
handlerResultList[2].Is("Handler3");
handlerResultList.Clear();
command.CanExecuteChanged -= handler2;
command.RaiseCanExecuteChanged();
System.Threading.Thread.Sleep(1000);
handlerResultList.Count.Is(2);
handlerResultList[0].Is("Handler1");
handlerResultList[1].Is("Handler3");
}
}
public void WeakHandlerTest()
{
using (var dispatcher = new TestDispatcherContext())
{
int eventReceivedCount = 0;
DispatcherHelper.UIDispatcher = dispatcher.Dispatcher;
var handlerResultList = new List<string>();
var command = new ViewModelCommand(() => { }, () => true);
var realReceiver1 = new EventReceiver(command,() => eventReceivedCount++);
var realReceiver2 = new EventReceiver(command, () => eventReceivedCount++);
var receiver1 = new WeakReference(realReceiver1);
var receiver2 = new WeakReference(realReceiver2);
var receiver3 = new EventReceiver(command, () => eventReceivedCount++);
command.RaiseCanExecuteChanged();
System.Threading.Thread.Sleep(1000);
eventReceivedCount.Is(3);
realReceiver1 = null;
realReceiver2 = null;
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
receiver1.IsAlive.Is(false);
receiver2.IsAlive.Is(false);
receiver3.IsNot(null);
command.RaiseCanExecuteChanged();
System.Threading.Thread.Sleep(1000);
eventReceivedCount.Is(4);
}
}
