Linq 多条件组合拼接排序

<%@ WebHandler Language="C#" Class="Huifang" %>using System;using System.Web;using Uzai.Shop.Entity.comment;using System.Collections.Generic;using Uzai.Shop.BLL.comment;using System.Linq;using System.Web.Script.Serialization;/// <summary>/// tanyong 2013-09-18/// </summary>public class Huifang : IHttpHandler {    #region 自定义变量    TalkBackBLL talkbll = new TalkBackBLL();    #endregion    public void ProcessRequest (HttpContext context) {        context.Response.ContentType = "text/plain";        string startDate = context.Request.QueryString["sDate"];        string endDate = context.Request.QueryString["eDate"];        string index = context.Request.QueryString["act"];        List<ProTalkBackEntity> list = talkbll.GetProTalkBack(Convert.ToDateTime(startDate), Convert.ToDateTime(endDate));        List<ProTalkBackEntity> proList = new List<ProTalkBackEntity>();        var query = list.GroupBy(t => t.ProductName).Select(p => new        {            ProductName = p.Key,            hascomment = p.Sum(x => x.hascomment),            Ding = p.Sum(x => x.Ding),            Zan = p.Sum(x => x.Zan)        });        if (index == "0")//点评            query = query.OrderByDescending(t => t.hascomment);        else if (index == "1")//顶            query = query.OrderByDescending(t => t.Ding);        else//赞            query = query.OrderByDescending(t=>t.Zan);        query = query.Take(10).ToList();// 赞，顶，点评最大的前10条数据                foreach (var item in query)        {            proList.Add(new ProTalkBackEntity() { ProductName = item.ProductName, hascomment = item.hascomment, Ding = item.Ding, Zan = item.Zan });        }        JavaScriptSerializer json = new JavaScriptSerializer();        string result = json.Serialize(proList);        context.Response.Write(result);    }     public bool IsReusable {        get {            return false;        }    }}