Microsoft.AspNet.SignalR.Hubs.StateChangeTracker.this C# (CSharp) Method

        public object this[string key]
        {
            get
            {
                object result;
                _values.TryGetValue(key, out result);
                return DynamicDictionary.Wrap(result);
            }
            set
            {
                if (!_oldValues.ContainsKey(key))
                {
                    object oldValue;
                    _values.TryGetValue(key, out oldValue);
                    _oldValues[key] = oldValue;
                }

                _values[key] = value;
            }
        }