ajax简单应用代码

ajax简单应用代码

@ webhandler language="c#" class="handler"  %>

    using system;
    using system.web;
    using system.collections.generic;
    using system.data;

    public class handler : ihttphandler
    {
        public void getpage( httpcontext context)
        {
            int pagenum = convert.toint32(context.request["pagenum"]);

pagenum++;
            if (pagenum <= 3)
            {
                dataset1.productdatatable cachedata =

(dataset1.productdatatable)context.cache["cachekey"];
                if (cachedata == null)
                {
                    cachedata = new

dataset1tableadapters.producttableadapter().getdatabypriceasc(1, 15);
                    context.cache.insert("cachekey", cachedata, null,

system.web.caching.cache.noabsoluteexpiration, timespan.fromseconds

(80));
                }
                list news = new list();
                for (int i = (pagenum * 5) - 4; i <= pagenum * 5; i++)
                {
                    dataset1.productrow row = cachedata[i - 1];
                    string s = link.toproduct(row.productid.tostring());
                    news.add(new product()
                    {
                        name = row.name,
                        description = row.description,
                        price = row.price.tostring(),
                        thumbnail = row.thumbnail,
                        path = s
                    });

                }
                system.web.script.serialization.网页特效serializer jss =

new system.web.script.serialization.网页特效serializer();
                context.response.write(jss.serialize(news));
            }

            else
            {

                var data = new

dataset1tableadapters.producttableadapter().getdatabypriceasc((pagenum *

5) - 4, pagenum * 5);
              
                list news = new list();
                for (int i =0; i <5; i++)
                {
                    dataset1.productrow row = data[i];
                    string s = link.toproduct(row.productid.tostring());
                    news.add(new product()
                    {
                        name = row.name,
                        description = row.description,
                        price = row.price.tostring(),
                        thumbnail = row.thumbnail,
                        path = s
                    });

                }
                system.web.script.serialization.javascriptserializer jss

= new system.web.script.serialization.javascriptserializer();
                context.response.write(jss.serialize(news));
          
            }

         }
        public void processrequest (httpcontext context)
        {
            context.response.contenttype = "text/plain";
            string action = context.request["action"];
            if (action == "getpage")
            {
                int allcount = new

dataset1tableadapters.producttableadapter().getcount().value;
                context.response.write(allcount);
             
            }
            else if (action == "getpagedateasc")
            {
              
                getpage("getpagedateasc", context);
            }
            else if (action == "getpagedatedesc")
            {
                getpage("getpagedatedesc", context);
            }
          
        }
    
    
        public bool isreusable
        {
            get
            {
                return false;
            }
        }
      
      

    }
    public class product
    {
        public string name { set; get; }
        public string description { set; get; }
        public string price { set; get; }
        public string thumbnail { set; get; }
        public string path { set; get; }

    }     

html代码//http://www.3ppt.com/design/asp教程x/38279.html

"http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">

    http://www.w3.org/1999/xhtml">
   
       
       

rel="stylesheet" type="text/css" />