Creating a blocking Queue in .NET?

Question

I have a scenario where I have multiple threads adding to a queue and multiple threads reading from the same queue. If the queue reaches a specific size all threads<

Answer 1

I just knocked this up using the Reactive Extensions and remembered this question:

public class BlockingQueue
{
    private readonly Subject _queue;
    private readonly IEnumerator _enumerator;
    private readonly object _sync = new object();

    public BlockingQueue()
    {
        _queue = new Subject();
        _enumerator = _queue.GetEnumerator();
    }

    public void Enqueue(T item)
    {
        lock (_sync)
        {
            _queue.OnNext(item);
        }
    }

    public T Dequeue()
    {
        _enumerator.MoveNext();
        return _enumerator.Current;
    }
}

Not necessarily entirely safe, but very simple.