public bool Contains(CollectionItem <T> item)
{
if (InnerDict.TryGetValue(item.Item, out List <int> indexes))
{
foreach (int index in indexes)
{
CollectionItem <T>?value = InnerList[index];
if (value is not null && value.Equals(item))
{
return(true);
}
}
}
return(false);
}
public CollectionItem <T>?this[int index]
{
get
{
return(InnerList[index]);
}
set
{
CollectionItem <T>?oldValue = InnerList[index];
CollectionItem <T>?newValue = value;
if (oldValue is null && newValue is null)
{
return;
}
if (oldValue is null || newValue is null || !oldValue.Equals(newValue))
{
if (!Contains(newValue !))
{
NotifyChangedEventArgs <CollectionItem <T>?> eventArgs = new NotifyChangedEventArgs <CollectionItem <T>?>(NotifyCollectionChangedAction.Replace, newValue, oldValue, index);
BeforeCollectionChanged?.Invoke(this, eventArgs);
if (oldValue is not null)
{
RemoveAt(oldValue, index);
}
InnerList[index] = newValue;
if (newValue is not null)
{
AddIndex(newValue.Item, index);
}
CollectionChanged?.Invoke(this, eventArgs);
}
}
}
}
