AzureStorageAnalyticsViewer.IsolatedStorageSettings.this C# (CSharp) Метод

        public string this[string idx]
        {
            get
            {
                return _dict[idx];
            }
            set
            {
                if (_dict.ContainsKey(idx))
                    _dict[idx] = value;
                else
                    _dict.Add(idx, value);
            }
        }