Second-level interaction with AjaxPro

<% @ Page Language = "C #" AutoEventWireup = "true" CodeFile = "Test. aspx. cs" Inherits = "Test" %> <! DOCTYPE html PUBLIC "-// W3C // Dtd XHTML 1.0 Transitional // EN" "http://www.w3.org/tr/xhtml1/Dtd/xhtml1-transitional.dtd"> Using System; using System. data; using System. configuration; using System. collections; using System. collections. generic; using System. web; using System. web. security; using System. web. UI; using System. web. UI. webControls; using System. web. UI. webControls. webParts; using System. web. UI. htmlControls;/*** Description: This article shows how to use AjaxPro to interact with the server, in addition, it also shows the set that can be directly called by the server in Js and the attribute * Author: Zhou Gong * Date: * Starting address: http: // blog .Csdn.net/zhoufoxcn/ **/public partial class Test: System. Web. UI. Page {protected void Page_Load (object sender, EventArgs e) {if (! Page. isPostBack) {List <State> stateList = new List <State> (10); stateList. add (new State (0, "select city"); // default stateList. add (new State (1, "Beijing"); stateList. add (new State (2, "Tianjin"); stateList. add (new State (3, "Shanghai"); stateList. add (new State (4, "Hubei"); stateList. add (new State (5, "Hunan"); stateList. add (new State (6, "Shanxi"); ddlStateList. dataSource = stateList; ddlStateList. dataBind (); ddlStateList. attributes ["onchange"] = "ShowCity (this. options [selectedIndex]. value) ";} AjaxPro. utility. registerTypeForAjax (typeof (Test); // register} [AjaxPro. ajaxMethod] public List <City> GetCityList (int stateId) {// Haha, all of which are List of cities or areas I know <City> cityList = new List <City> (12 ); cityList. add (new City (11, "Haidian District", 1); cityList. add (new City (12, "Chaoyang District", 1); cityList. add (new City (13, "Dagang district", 2); cityList. add (new City (14, "Nankai district", 2); cityList. add (new City (15, "Putuo District", 3); cityList. add (new City (16, "Huangpu District", 3); cityList. add (new City (17, "Huanggang City", 4); cityList. add (new City (18, "Jingzhou", 4); cityList. add (new City (19, "Changsha City", 5); cityList. add (new City (20, "Yueyang City", 5); cityList. add (new City (21, "Taiyuan City", 6); cityList. add (new City (22, "Datong City", 6); List <City> tempList = new List <City> (); for (int I = 0; I <cityList. count; I ++) {if (cityList [I]. stateId = stateId) {tempList. add (cityList [I]) ;}} return tempList ;}} /// <summary> /// province information /// </summary> public class State {private int stateId; private string stateName; /// <summary> /// province name /// </summary> public string StateName {get {return stateName;} set {stateName = value ;}} /// <summary> /// province no. /// </summary> public int StateId {get {return stateId;} set {stateId = value ;}} public State (int stateId, string stateName) {this. stateId = stateId; this. stateName = stateName ;}/// <summary> // City information /// </summary> public class City {private int cityId; private int stateId; private string cityName; /// <summary> // city name // </summary> public string CityName {get {return cityName;} set {cityName = value ;}} /// <summary> /// province ID of the city /// </summary> public int StateId {get {return stateId;} set {stateId = value ;}} /// <summary> // city no. // </summary> public int CityId {get {return cityId;} set {cityId = value ;}} public City (int cityId, string cityName, int stateId) {this. cityId = cityId; this. cityName = cityName; this. stateId = stateId ;}}