/// <summary>
/// 全班单道题的结果统揽，echart图部分接口
/// </summary>
/// <param name="practiceRecordId">练习卷Id</param>
/// <param name="questionId">习题Id</param>
/// <returns></returns>
public string oneQuestionClassStatistics()
{
AllStudentQuestionStatisticsService allStudentQuestionStatisticsService = new AllStudentQuestionStatisticsService();
Dictionary <string, object> dic = allStudentQuestionStatisticsService.oneQuestionRecordStatistics(mUCPractice.exerciseRecordId, mUCPractice.questionId);
return(MLPen.Helpers.JsonHelper.ToJSON(dic));
}