public void EventAddRemoveAnonymousFunction()
{
var x = new EventThing();
x.MyEvent += (object sender, EventArgs args) => { HandlerToRemove(sender, args); };
x.MyEvent -= (object sender, EventArgs args) => { HandlerToRemove(sender, args); };
x.OnMyEvent();
}
public void EventAddRemoveMethod()
{
var x = new EventThing();
x.MyEvent += HandlerToRemove;
x.MyEvent -= HandlerToRemove;
x.OnMyEvent();
}
public void EventAddRemoveLambda()
{
var x = new EventThing();
x.MyEvent += (sender, args) => HandlerToRemove(sender, args);
x.MyEvent -= (sender, args) => HandlerToRemove(sender, args);
x.OnMyEvent();
}
public void EventAddRemoveMethodRef()
{
var x = new EventThing();
EventHandler handlerToRemove = HandlerToRemove;
x.MyEvent += handlerToRemove;
x.MyEvent -= handlerToRemove;
x.OnMyEvent();
}
public void EventAddRemoveLocalFunction()
{
var x = new EventThing();
void handler(object sender, EventArgs args)
{
HandlerToRemove(sender, args);
}
x.MyEvent += handler;
x.MyEvent -= handler;
x.OnMyEvent();
}
public void TestEventNotNull()
{
EventThing thing = new EventThing();
DoStuff(thing);
Assert.AreEqual(EventSubscriber.Count, 1);
GC.Collect();
GC.WaitForPendingFinalizers();
Assert.AreEqual(EventSubscriber.Count, 1, "Event sub list should still hold a subscriber reference");
thing.OnMyEvent();
}
public void TestEventNull()
{
EventThing thing = new EventThing();
DoStuff(thing);
Assert.AreEqual(EventSubscriber.Count, 1);
thing.SetEventNull(); // Should clear out the list, removing all refs to subscribers
GC.Collect();
GC.WaitForPendingFinalizers();
Assert.AreEqual(EventSubscriber.Count, 0, "Setting event to null should have cleared sub list");
thing.OnMyEvent();
}
public void NoObjectInitializersWithEvents()
{
bool firstHappened = false;
bool secondHappened = false;
var x = new EventThing();
// With Events, we required two statements to initialize
x.MyEvent += (sender, args) => { firstHappened = true; };
// And still do multiple handlers, like this:
x.MyEvent += (sender, args) => { secondHappened = true; };
x.OnMyEvent();
Assert.True(firstHappened);
Assert.True(secondHappened);
}
static void DoStuff(EventThing thing)
{
new EventSubscriber(thing);
thing.OnMyEvent();
}