How to consume a BlockingCollection<T> in batches

I've come up with some code to consume all wating items from a queue. Rather than processing the items 1 by 1, it makes sense to process all waiting items as a set.

I've declared my queue like this.

private BlockingCollection<Item> items = 
    new BlockingCollection<Item>(new ConcurrentQueue<Item>);

Then, on a consumer thread, I plan to read the items in batches like this,

Item nextItem;
while (this.items.TryTake(out nextItem, -1))
{
    var workToDo = new List<Item>();
    workToDo.Add(nextItem);

    while(this.items.TryTake(out nextItem))
    {
        workToDo.Add(nextItem);
    }

    // process workToDo, then go back to the queue.
}

This approach lacks the utility of GetConsumingEnumerable and I can't help wondering if I've missed a better way, or if my approach is flawed.

Is there a better way to consume a BlockingCollection<T> in batches?