本文共 1517 字，大约阅读时间需要 5 分钟。

webform1.aspx

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace test13_2{    public partial class WebForm1 : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {            List
   
     dataM = new List
    
                 {                new News { title="冬奥会开幕了！",id=4888,categories="国际新闻"},                new News { title="中国第一艘航母下水！",id=4580,categories="中国新闻"},                new News { title="IPHONE 5S上市了！",id=4688,categories="国际新闻"},                new News { title="发行新股将实行注册制度！",id=3888,categories="中国新闻"},                new News { title="美国政府暂时停止工作！",id=2888,categories="国际新闻"},                new News { title="新兴市场股票大涨！",id=4568,categories="国际新闻"}            };            var query1 = from str in dataM                         where str.categories == "国际新闻"                         orderby str.id descending                         select str.title;  // select str;            Response.Write("
     热点新闻包括：
     
");            foreach (var news in query1)            {                Response.Write(news + "
     
");                //Response.Write(news.title + "
     
");            }        }    }}
    
   

news.cs  类

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace test13_2{    class News    {        public int id { get; set; }        public string title { get; set; }        public string categories { get; set; }    }}