public void Clear()
{
var itemsWhichCanNotBeRemoved = new List <T>();
var beforeHandler = Volatile.Read(ref ItemRemoving);
foreach (var item in this)
{
if (beforeHandler != null)
{
var eventArgs = new CancelableItemEventArgs <T>(item);
beforeHandler(this, eventArgs);
if (eventArgs.IsCanceled)
{
itemsWhichCanNotBeRemoved.Add(item);
}
}
}
if (itemsWhichCanNotBeRemoved.Count == 0)
{
var copy = new List <T>(this);
ClearImplementation();
var afterHandler = Volatile.Read(ref ItemRemoved);
foreach (var item in copy)
{
afterHandler?.Invoke(this, new ItemEventArgs <T>(item));
}
}
else
{
throw new ItemsCantBeRemovedException <T>(itemsWhichCanNotBeRemoved);
}
}
public void Add(T item)
{
var beforeHandler = Volatile.Read(ref ItemAdding);
if (beforeHandler != null)
{
var eventArgs = new CancelableItemEventArgs <T>(item);
beforeHandler(this, eventArgs);
if (eventArgs.IsCanceled)
{
return;
}
}
AddImplementation(item);
Volatile.Read(ref ItemAdded)?.Invoke(this, new ItemEventArgs <T>(item));
}
public Boolean Remove(T item)
{
var beforeHandler = Volatile.Read(ref ItemRemoving);
if (beforeHandler != null)
{
var eventArgs = new CancelableItemEventArgs <T>(item);
beforeHandler(this, eventArgs);
if (eventArgs.IsCanceled)
{
return(false);
}
}
Boolean result = RemoveImplementation(item);
Volatile.Read(ref ItemRemoved)?.Invoke(this, new ItemEventArgs <T>(item));
return(result);
}
