DynamicRest.RestOperation.Callback C# (CSharp) Method

        public void Callback(RestCallback callback)
        {
            if (callback == null) {
                throw new ArgumentNullException("callback");
            }

            if (_completed) {
                callback();
            }

            if (_callbacks == null) {
                _callbacks = new List<RestCallback>();
            }
            _callbacks.Add(callback);
        }