多条件分页存储过程控制器写法

public PageList<StudentsInfo> Page(string Name, string Start_Time, string End_Time, int Grade_TypeId, int id = 0)
        {
            ViewBag.Grade_Id = new SelectList(studentsbll.Grade_TypeList(), "Grade_Id", "Grade_Name");

            StringBuilder strb = new StringBuilder();
            strb.Append(" 1=1 ");
            if (!string.IsNullOrEmpty(Name))
            {
                strb.Append(" and Name like '%" + Name + "%'");
            }
            if (!string.IsNullOrEmpty(Start_Time) && !string.IsNullOrEmpty(End_Time))
            {
                strb.Append(" and(Start_Time between'" + Start_Time + "'and'" + End_Time + "')");
            }
            if (Grade_TypeId != 0)
            {
                strb.Append(" and a.Grade_Id=" + Grade_TypeId);
            }
            ParamModel parammodel = new ParamModel()
            {
                TableName = "StudentsInfo a inner join Grade_Type b on a.Grade_Id=b.Grade_Id",
                IndexCol = "Id",
                PageSize = 3,
                PageIndex = id,
                OrderCol = "Id desc",
                StrWhere = strb.ToString(),
                Columns = "*"
            };
            var list = studentsbll.GetStudentInfos(parammodel);
            ViewBag.PageIndex = id;
            ViewBag.TotalPage = list.TotalCount % parammodel.PageSize != 0 ? list.TotalCount / parammodel.PageSize + 1 : parammodel.PageSize;
            return list;
        }