ASP.Net中省市级联有关

 1 public partial class City : System.Web.UI.Page
 2 {
 3     protected void Page_Load(object sender, EventArgs e)
 4     {
 5         if(!IsPostBack)
 6         {
 7             BindProv();
 8             BindCity();
 9         }
10     }
11 
12     //绑定市
13     private void BindCity()
14     {
15         ddlcity.Items.Clear();
16         DataTable citydt = new CitySer().GetAllCityByProvId(int.Parse(ddlprov.SelectedValue.ToString()));
17         foreach (DataRow dr in citydt.Rows)
18         {
19             ddlcity.Items.Add(new ListItem(dr["cityName"].ToString(), dr["id"].ToString()));
20         }
21     }
22     //绑定省
23     private void BindProv()
24     {
25         ddlprov.Items.Clear();
26         DataTable dt = new CitySer().GetAllProv();
27         foreach(DataRow dr in dt.Rows)
28         {
29             ddlprov.Items.Add(new ListItem(dr["provinceName"].ToString(),dr["id"].ToString()));
30         }
31     }
32     //联动
33     protected void ddlprov_SelectedIndexChanged(object sender, EventArgs e)
34     {
35         if (ddlprov.Items.Count != 0)
36         {
37             ddlcity.Items.Clear();
38             DataTable citydt = new CitySer().GetAllCityByProvId(int.Parse(ddlprov.SelectedValue.ToString()));
39             foreach (DataRow dr in citydt.Rows)
40             {
41                 ddlcity.Items.Add(new ListItem(dr["cityName"].ToString(), dr["id"].ToString()));
42             }
43         }
44     }
45 }