private void GetSymbol(Dictionary<string, string> rDict) { if (rDict == null) throw new ArgumentNullException(nameof(rDict)); rDict.Add("symbol_no", MiApi.mitab_c_get_symbol_no(this.Handle).ToString()); rDict.Add("symbol_size", MiApi.mitab_c_get_symbol_size(this.Handle).ToString()); rDict.Add("symbol_color", MiApi.mitab_c_get_symbol_color(this.Handle).ToString()); }