/// <summary>
 /// 获取所有数据
 /// </summary>
 /// <typeparam name="T"></typeparam>
 /// <param name="output"></param>
 /// <returns></returns>
 public static IEnumerable <T> GetAllData <T>(this ExcelSheetDataOutput <T> output) where T : class, new()
 {
     return(output?.GetData(null));
 }
 /// <summary>
 /// 获取有效数据
 /// </summary>
 /// <typeparam name="T"></typeparam>
 /// <param name="output"></param>
 /// <returns></returns>
 public static IEnumerable <T> GetValidData <T>(this ExcelSheetDataOutput <T> output) where T : class, new()
 {
     return(output?.GetData(true));
 }