public async Task EventHoldsWeakReference()
{
var eventFirer = new EventFirer();
WeakReference reference;
{
var handler = new Handler <EventArgs <string> >();
reference = new WeakReference(handler);
eventFirer.MyEvent += handler.HandleEvent;
eventFirer.OnMyEvent("FooBar");
}
var pos = 0;
while (reference.Target != null && pos < 10)
{
await Task.Delay(1000);
GC.Collect();
GC.WaitForPendingFinalizers();
eventFirer.OnMyEvent("HelloWorld");
pos++;
}
reference.Target.Should().BeNull();
GC.KeepAlive(eventFirer);
}
public void FiringEventFiresToHandler()
{
string result = null;
var eventFirer = new EventFirer();
eventFirer.MyEvent += (s, e) => { result = e.Value; };
eventFirer.OnMyEvent("FooBar");
result.Should().Be("FooBar");
}
public void FiringRemovedSimpleEventDoesntFireToHandler()
{
var fired = false;
var eventFirer = new EventFirer();
EventHandler handler = (sender, args) => fired = true;
eventFirer.MySimpleEvent += handler;
eventFirer.MySimpleEvent -= handler;
eventFirer.OnMyEvent("FooBar");
fired.Should().BeFalse();
}
public void FiringRemovedEventDoesntFireToHandler()
{
string result = null;
var eventFirer = new EventFirer();
EventHandler <EventArgs <string> > handler = (sender, args) => result = args.Value;
eventFirer.MyEvent += handler;
eventFirer.MyEvent -= handler;
eventFirer.OnMyEvent("FooBar");
result.Should().BeNull();
}
public void FiringEventFiresToMultipleHandlers()
{
string result1 = null;
string result2 = null;
var eventFirer = new EventFirer();
eventFirer.MyEvent += (s, e) => { result1 = e.Value; };
eventFirer.MyEvent += (s, e) => { result2 = e.Value; };
eventFirer.OnMyEvent("FooBar");
result1.Should().Be("FooBar");
result2.Should().Be("FooBar");
}