/// <summary> /// 通过字段名获取排序类型的索引器 /// </summary> /// <param name = "fieldName">字段名</param> /// <returns>排序类型</returns> public override sealed OrderByType this[string fieldName] { get { lock (syncRoot) { return(innerNoC.Get(fieldName)); } } set { lock (syncRoot) { innerNoC.Add(fieldName, value); } } }