当前文件： myAjaxDropdownlist/Handler.ashx[2K，2009-6-12 11:48:08]，打开代码结构图

		            
 1<%...@ WebHandler Language="C#" Class="Handler" %>
 2
 3using System;
 4using System.Web;
 5using System.Data.SqlClient;
 6using System.Data;
 7
 8public class Handler : IHttpHandler {
 9    
10    public void ProcessRequest (HttpContext context) {
11        string type = context.Request.QueryString["type"];
12        if (type.Equals("sheng"))
13        {
14            string id = context.Request.QueryString["id"];
15            context.Response.ContentType = "text/plain";
16            context.Response.Write(getSheng(id));//这个是从数据库中根据传来省的id 查询出来的。市的名字和主键，主键以便去查区的名字
17        }
18        else if (type.Equals("shi"))
19        {
20            string id = context.Request.QueryString["id"];
21            context.Response.ContentType = "text/plain";
22            context.Response.Write(getqu(id));    
23        }
24    }
25
26    public string getqu(string shi)
27    {
28        DataSet ds = SqlDataAccess.GetAreaInfo(shi);
29        string str = "";
30        for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
31        {
32            if (i == ds.Tables[0].Rows.Count - 1)
33            {
34                str += ds.Tables[0].Rows[i]["code"].ToString() + "," + ds.Tables[0].Rows[i]["name"].ToString();
35            }
36            else 
37            {
38                str += ds.Tables[0].Rows[i]["code"].ToString() + "," + ds.Tables[0].Rows[i]["name"].ToString() + "|"; 
39            }
40        }
41        return str.Trim(); 
42    }
43    public string getSheng(string sheng)
44    {
45        DataSet ds = SqlDataAccess.GetCityInfo(sheng);
46        string str = "";
47        for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
48        {
49            if (i == ds.Tables[0].Rows.Count - 1)
50            {
51                str += ds.Tables[0].Rows[i]["code"].ToString() + "," + ds.Tables[0].Rows[i]["name"].ToString();
52            }
53            else
54            {
55                str += ds.Tables[0].Rows[i]["code"].ToString() + "," + ds.Tables[0].Rows[i]["name"].ToString() + "|";
56            }
57        }
58        return str.Trim();
59    }
60    
61    
62    public bool IsReusable {
63        get {
64            return false;
65        }
66    }
67
68}