public static string GetDataList(string UserGroup_ParentId, string GroupName, int PageSize, int PageIndex)
        {
            try
            {
                BLL_UserGroup_Member bll = new BLL_UserGroup_Member();
                UserGroup_ParentId = UserGroup_ParentId.Filter();
                GroupName          = GroupName.Filter();

                DataTable     dt         = new DataTable();
                List <object> listReturn = new List <object>();
                string        strWhere   = "User_ApplicationStatus='passed' and UserGroup_Id='" + UserGroup_ParentId + "' ";
                if (!string.IsNullOrEmpty(GroupName))
                {
                    strWhere += " and (UserName like '%" + GroupName + "%' or TrueName like '%" + GroupName + "%') ";
                }
                string orderBy = string.Format("UserStatus,charindex(MembershipEnum,'{0},{1},{2}'),TrueName,User_ApplicationPassTime desc",
                                               MembershipEnum.headmaster, MembershipEnum.teacher, MembershipEnum.student);
                dt = bll.GetClassMemberListByPageEX(strWhere, orderBy, ((PageIndex - 1) * PageSize + 1), (PageIndex * PageSize)).Tables[0];
                int rCount = bll.GetRecordCount(strWhere);

                int inum = 0;
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    string userName = dt.Rows[i]["TrueName"].ToString();
                    if (string.IsNullOrEmpty(userName))
                    {
                        userName = dt.Rows[i]["UserName"].ToString();
                    }
                    userName += "(" + dt.Rows[i]["UserName"].ToString() + ")";
                    inum++;
                    listReturn.Add(new
                    {
                        inum                     = (i + 1),
                        Row                      = dt.Rows[i]["Row"],
                        User_Id                  = dt.Rows[i]["User_Id"],
                        UserGroup_Member_Id      = dt.Rows[i]["UserGroup_Member_Id"],
                        UserName                 = userName,
                        User_ApplicationPassTime = pfunction.ConvertToLongDateTime(dt.Rows[i]["User_ApplicationPassTime"].ToString()),
                        UserStatus               = dt.Rows[i]["UserStatus"].ToString(),
                        Email                    = dt.Rows[i]["Email"].ToString(),
                        MembershipEnum           = dt.Rows[i]["MembershipEnum"],
                        ClassName                = dt.Rows[i]["ClassName"],
                        MembershipEnumName       = (dt.Rows[i]["MembershipEnum"].ToString() == MembershipEnum.teacher.ToString()) ? dt.Rows[i]["SubjectName"].ToString() + "老师" : Rc.Common.EnumService.GetDescription <MembershipEnum>(dt.Rows[i]["MembershipEnum"].ToString())
                    });
                }

                if (inum > 0)
                {
                    return(JsonConvert.SerializeObject(new
                    {
                        err = "null",
                        PageIndex = PageIndex,
                        PageSize = PageSize,
                        TotalCount = rCount,
                        list = listReturn
                    }));
                }
                else
                {
                    return(JsonConvert.SerializeObject(new
                    {
                        err = "暂无数据"
                    }));
                }
            }
            catch (Exception ex)
            {
                return(JsonConvert.SerializeObject(new
                {
                    err = "error"//ex.Message.ToString()
                }));
            }
        }