public List<fuction> Getlist(string School)

        {

            Db_Jst_ChatgroupDataContext S_Info = new Db_Jst_ChatgroupDataContext();

            IQueryable<fuction> item = from G_info in S_Info.Group_Info1

                                       from G_School in S_Info.Group_SchoolInfo

                                       where G_info.Gschool.Equals(School)

                                       select new fuction

                                       {

                                           省份 = G_info.Gprovince,

                                           学校 = G_info.Gschool,

                                           班级 = G_info.GroupName,

                                           联系人 = G_School.Contact,

                                           联系邮箱 = G_School.Email,

                                           联系电话 = G_School.Tel

                                       };

            return item.ToList();

        }

public class FuctionComparer : IEqualityComparer<fuction>