/*获取指定用户在某区间内所有完成的病历*/
 public CaseHistory GetCaseHistory(string userID, string password, DateTime? startDate, DateTime? endDate) {
     UserService userService = new UserService();
     UserInfo userInfo = userService.Login(userID, password);
     if (userInfo.ErrorMessage == null) {
         /*不显示ICD-10编码*/
         return userService.GetCaseHistory(startDate, endDate, false);
     }
     else {
         CaseHistory    caseHistory =  new CaseHistory();
         caseHistory.ErrorMessage = userInfo.ErrorMessage;
         return caseHistory;
     }
 }