Exception:解析表达式出错。 内部错误：给定关键字不在字典中。 原始表达式： string indexName = {索引}; if(!string.IsNullOrWhiteSpace(indexName)){ Dictionary<string,object> dict = (Dictionary<string,object>){indexDict}; Dictionary<string,object> subDict = (Dictionary<string,object>)dict[indexName]; MessageBox.show(subDict.ToJson()); //return subDict["fieldsList"]; }