Linq分頁

       public void GetCollegeList(HttpContext context)
        {
            try
            {
                int pageSize = CF.ToInt(context.Request.QueryString["pageSize"], 0);
                int pageIndex = CF.ToInt(context.Request.QueryString["pageIndex"], 0); 
                string keywords = context.Request.QueryString["k"];
                IQueryable<DLX_CollegeInfo> msgQuery;
                if (!string.IsNullOrEmpty(keywords))
                {
                    msgQuery = from e in _dataContext.DLX_CollegeInfo
                               where e.Title.Contains(keywords)
                               select e;
                }
                else
                {
                    msgQuery = from e in _dataContext.DLX_CollegeInfo
                               select e;
                }
                int totalCount = msgQuery.Count();
                List<DLX_CollegeInfo> msgList;
                msgList = msgQuery.OrderByDescending(e => e.CreateTime).Skip(pageSize * pageIndex).Take(pageSize).ToList();

                if (msgList != null && msgList.Count > 0)
                {
                    object[] msgObj = new object[msgList.Count];
                    for (int i = 0; i < msgList.Count; i++)
                    {
                        DLX_CollegeInfo msgEntity = msgList[i];
                        msgObj[i] = new
                        {
                            Id = msgEntity.Id,
                            Title = msgEntity.Title,
                            Content =CF.SubHtmlContentByLength(Convert.ToString( msgEntity.Content), 20),
                            ImageUrl = msgEntity.ImageUrl,
                            CreateUser = msgEntity.CreateUser,
                            CreateTime = msgEntity.CreateTime.ToString("yyyy/MM/dd")
                        };
                    }
                    var resJsonObj = new
                    {
                        status = "S",
                        TotalCount = totalCount,
                        CollegeList = msgObj
                    };

                    context.Response.Write(JsonConvert.SerializeObject(resJsonObj));
                }
                else
                {
                    var resJsonObjE = new
                    {
                        status = "E"
                    };
                    context.Response.Write(JsonConvert.SerializeObject(resJsonObjE));
                }
            }
            catch (Exception ex)
            {
                LogHelper.Fatal("GetCollegeList Error", ex);
                var resJsonObjE = new
                {
                    status = "F",
                    message = ex.Message
                };
                context.Response.Write(JsonConvert.SerializeObject(resJsonObjE));
            }
        }