public void ActionAddRemoveMethod()
{
var x = new PublicAction();
x.MyEvent += ActionToRemove2;
x.MyEvent -= ActionToRemove2;
x.OnMyEvent();
}
public void ActionAddRemoveAnonymousFunction()
{
var x = new PublicAction();
x.MyEvent += (PublicAction a) => { ActionToRemove2(a); };
x.MyEvent -= (PublicAction a) => { ActionToRemove2(a); };
x.OnMyEvent();
}
public void ActionAddRemoveLambda()
{
var x = new PublicAction();
x.MyEvent += (a) => ActionToRemove2(a);
x.MyEvent -= (a) => ActionToRemove2(a);
x.OnMyEvent();
}
public void ActionAddRemoveMethodRef()
{
var x = new PublicAction();
Action <PublicAction> actionToRemove = ActionToRemove2;
x.MyEvent += actionToRemove;
x.MyEvent -= actionToRemove;
x.OnMyEvent();
}
public void ActionAddRemoveLocalFunction()
{
var x = new PublicAction();
void actionToRemove(PublicAction a)
{
ActionToRemove2(a);
}
x.MyEvent += actionToRemove;
x.MyEvent -= actionToRemove;
x.OnMyEvent();
}
public void ObjectInitializers()
{
bool firstHappened = false;
bool secondHappened = false;
var x = new PublicAction()
{
// So if we use a publicly accessible Action (without the event keyword),
// we can do this, which is cool
MyEvent = (a) => { firstHappened = true; }
};
// And still do multiple handlers, like this:
x.MyEvent += (a) => { secondHappened = true; };
x.OnMyEvent();
Assert.True(firstHappened);
Assert.True(secondHappened);
}
public void BadEncapsulation()
{
bool firstHappened = false;
bool secondHappened = false;
var x = new PublicAction()
{
MyEvent = (a) => { firstHappened = true; }
};
// And the syntax folks are familiar with still works
x.MyEvent += (a) => { secondHappened = true; };
// But if we use a publicly accessible Action (without the event keyword), that means
// that anyone could nuke our event handlers, like this:
x.MyEvent = null;
x.OnMyEvent();
Assert.False(firstHappened);
Assert.False(secondHappened);
}
private void ActionToRemove2(PublicAction action)
{
Assert.Fail("This should not be called");
}