可绑定的集合，该集合在顶部插入并从底部删除

Question

I am using an ObservableCollection to which 25 items will be added per second in a background thread. The items are added using Insert to 0th position. After a time period, old items are being removed in a background thread. The items at the end are being removed using RemoveAt . This collection is binded to a datagrid. CPU usage is increasing and the UI is not responsive since these operations are being done.

I have tried creating a custom stack and it won't satisfy the complete requirement as the items cannot be removed from bottom in an efficient way.

I need to create a bindable custom collection which inserts item to the top and removes from bottom in a very efficient manner.

Looking forward to any kind of input/suggestions. Thanks.

Answer 1

How about deriving your custom collection from ObservableCollection and just adding the bare minimum of needed extra functionality? Something along the lines of

class ExtendedObservableCollection<T> : ObservableCollection<T>
{
    public void AddRange(int startingIndex, IEnumerable<T> items)
    {
        var notifier = new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, items.ToList(), startingIndex);

        foreach (var item in items)
        {
            // insert to the underlying collection to avoid change events
            Items.Insert(startingIndex++, item);
        }

        OnCollectionChanged(notifier);
    }

    public void RemoveRange(int startingIndex, int count)
    {
        // Do it yourself
    }
}