动态创建分页 LINQ+EF

  
  public class Message
    {
        public int MessageId { get; set; }
        public string MessageTitle { get; set; }
        public string MessageContent { get; set; }
        public DateTime? MessageDate { get; set; }
        public string MessageType { get; set; }
        public int? MessageAuthorId { get; set; }
        public int MessageStart { get; set; }
        public int? ParentID { get; set; }
        public string remark { get; set; }
    }


    //总条数+数据
    public class MessageCount
    {
        public int count { get; set; }
        public List<Message> MessageList { get; set; }
    }

　　　　　/// <summary>
        /// 分页查询
        /// </summary>
        public MessageCount getMessaggePage(string MessageId, string MessageTitle, string MessageContent, string MessageType, string MessageAuthorId, string MessageStart, string ParentID, string remark, int min, int max)
        {

            ZQSDWEBEntities2 ZQSDWEBEntities2 = new ZQSDWEBEntities2();
            MessageCount messageCount = new MessageCount();

            messageCount.count = ZQSDWEBEntities2.MessageDetail.Count<MessageDetail>();

            //IEnumerable<Message> messageList = (from h in ZQSDWEBEntities2.MessageDetail
            //                                    where h.ParentID == ParentID && h.MessageStart == MessageStart &&
            //                                    h.MessageAuthorId == MessageAuthorId && h.MessageContent == MessageContent&&
            //                                 h.MessageId == MessageId&&
            //                                    h.MessageTitle == MessageTitle && h.MessageType == MessageType&&
            //                                    h.remark == remark
            //                                    select new mode.Message()
            //                                    {

            //                                        MessageId = h.MessageId,
            //                                        MessageAuthorId = h.MessageAuthorId,
            //                                        MessageContent = h.MessageContent,
            //                                        MessageDate = h.MessageDate,
            //                                        MessageStart = h.MessageStart,
            //                                        MessageTitle = h.MessageTitle,
            //                                        MessageType = h.MessageType,
            //                                        ParentID = h.ParentID,
            //                                        remark = h.remark
            //                                    }).OrderBy(h=>h.MessageId).Skip<Message>(min).Take<Message>(max);

             IQueryable<MessageDetail> odj = ZQSDWEBEntities2.MessageDetail;

            try
            {
               
                if (MessageId != null)
                {
                    int tem = Convert.ToInt32(MessageId);
                    odj = odj.Where(M => M.MessageId == tem);
                }
                if (MessageTitle != null)
                {
                    odj = odj.Where(M => M.MessageTitle.StartsWith(MessageTitle));
                }
                if (MessageContent != null)
                {
                    odj = odj.Where(M => M.MessageContent.StartsWith(MessageContent));
                }
                if (MessageType != null)
                {
                    odj = odj.Where(M => M.MessageType == MessageType);
                }
                if (MessageAuthorId != null)
                {
                    int tem = Convert.ToInt32(MessageAuthorId);
                    odj = odj.Where(M => M.MessageAuthorId == tem);
                }
                if (MessageStart != null)
                {
                    int tem = Convert.ToInt32(MessageStart);
                    odj = odj.Where(M => M.MessageStart == tem);

                }
                if (ParentID != null)
                {
                    int tem = Convert.ToInt32(ParentID);
                    odj = odj.Where(M => M.ParentID == tem);

                }
                if (remark != null)
                {
                    odj = odj.Where(M => M.remark == remark);
                }
                odj = odj.OrderBy(Math => Math.MessageId).Skip(min).Take(max);
            }
            catch (Exception ex)
            {

                throw ex;
            }

            messageCount.MessageList = (from h in odj
                                       select new Message()
                                       {
                                           MessageId = h.MessageId,
                                           MessageAuthorId = h.MessageAuthorId,
                                           MessageContent = h.MessageContent,
                                           MessageDate = h.MessageDate,
                                           MessageStart = h.MessageStart,
                                           MessageTitle = h.MessageTitle,
                                           MessageType = h.MessageType,
                                           ParentID = h.ParentID,
                                           remark = h.remark

                                       }).ToList();
            return messageCount;

            // 拉姆达表达式
            //  adapter.GetData().Select(d=>new Customer(){ID=d.ID,...})

            //List<MessageDetail> MessageDetails = ZQSDWEBEntities2.MessageDetail.Where<MessageDetail>(M => M.ParentID == PrentId && M.MessageStart == 1).ToList<MessageDetail>();
            //   return JsonConvert.SerializeObject(MessageDetails, Formatting.None);

        }