public void Test_MemoryLeak_WeakPropertyBinding_Getter_Setter()
{
var viewModel = new TestViewModel();
var viewModel2 = new TestViewModel2();
var viewModel1 = new TestViewModel();
var viewModel21 = new TestViewModel2();
var reference = new WeakReference(viewModel1);
var reference2 = new WeakReference(viewModel21);
WeakBinding binding = new WeakPropertyBinding(viewModel2, null, viewModel, null)
.Initialize<WeakPropertyBinding>()
.SetMode<WeakPropertyBinding>(BindMode.TwoWay)
.SetTargetPropertyGetter(arg => viewModel1.Name)
.SetSourcePropertyGetter(arg => viewModel21.Name)
.SetTargetPropertySetter((data, value) => viewModel1.Name = value.ToStringWithoutException())
.SetSourcePropertySetter((data, value) => viewModel21.Name = value.ToStringWithoutException())
.AttachTargetEvent("TestViewModelEvent")
.AttachSourceEvent("TestViewModelEvent");
viewModel21.Name = Name1;
viewModel.RaiseTestViewModelEvent();
Assert.AreEqual(viewModel1.Name, Name1);
viewModel1.Name = Name2;
viewModel2.RaiseTestViewModelEvent();
Assert.AreEqual(viewModel21.Name, Name2);
viewModel1 = null;
GC.Collect();
Assert.IsFalse(reference.IsAlive);
viewModel21 = null;
GC.Collect();
Assert.IsFalse(reference2.IsAlive);
GC.KeepAlive(binding);
}
public void Test_WeakBinding_AttachSourceEvent()
{
var viewModel = new TestViewModel();
var view = new TestView();
new WeakPropertyBinding(view, "Text1", viewModel, "Name")
.Initialize<WeakPropertyBinding>()
.AttachSourceEvent("TestViewModelEvent");
viewModel.Name = Name1;
Assert.AreNotEqual(view.Text1, Name1);
viewModel.RaiseTestViewModelEvent();
Assert.AreEqual(view.Text1, Name1);
}
public void Test_MemoryLeak_WeakEvent()
{
// 1. Normal Event will hold the strong reference which prevent the GC collect.
var view = new TestView();
var viewModel = new TestViewModel();
var reference = new WeakReference(view);
viewModel.TestViewModelEvent += view.OnEventOccured;
viewModel.RaiseTestViewModelEvent();
Assert.AreEqual(1, view.EventCount);
Assert.AreEqual(1, viewModel.GetTestViewModelEventInvocationCount());
view = null;
GC.Collect();
Assert.IsTrue(reference.IsAlive); // Still live
viewModel.TestViewModelEvent -= reference.GetTarget<TestView>().OnEventOccured;
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
Assert.IsFalse(reference.IsAlive);
reference = null;
Assert.IsNull(reference.GetTarget<TestView>());
// 2. WeakEvent hold the weak reference which will not prevent GC collect.
var view2 = new TestView();
var viewModel2 = new TestViewModel();
var reference2 = new WeakReference(view2);
var weakEvent = new WeakEvent(view2);
weakEvent.AttachEvent(viewModel2, null, "TestViewModelEvent", "OnEventOccured");
viewModel2.RaiseTestViewModelEvent();
Assert.AreEqual(1, view2.EventCount);
view2 = null;
GC.Collect();
Assert.IsFalse(reference2.IsAlive);
viewModel2.RaiseTestViewModelEvent();
Assert.AreEqual(0, viewModel2.GetTestViewModelEventInvocationCount());
}