教你如何利用ajaxpro实现两级联动代码

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;



/**

* 写作说明：本文展示了如何利用AjaxPro与服务器交互，并且还展示了在Js中可以直接调用服务器返回的集合和直接调用服务器上class的属性

* 作者：周公

* 日期：2008-1-1

* 首发地址：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 stateList = new List(10);

stateList.Add(new State(0, "选择城市"));//默认选项

stateList.Add(new State(1,"北京"));

stateList.Add(new State(2, "天津"));

stateList.Add(new State(3, "上海"));

stateList.Add(new State(4, "湖北"));

stateList.Add(new State(5, "湖南"));

stateList.Add(new State(6, "山西"));

ddlStateList.DataSource = stateList;

ddlStateList.DataBind();

ddlStateList.Attributes["onchange"] = "ShowCity(this.options[selectedIndex].value)";

}

AjaxPro.Utility.RegisterTypeForAjax(typeof(Test));//注册

}

[AjaxPro.AjaxMethod]

public List GetCityList(int stateId)

{

//呵呵，都是我熟悉的城市或者区

List cityList = new List(12);

cityList.Add(new City(11, "海淀区", 1));

cityList.Add(new City(12, "朝阳区", 1));

cityList.Add(new City(13, "大港区", 2));

cityList.Add(new City(14, "南开区", 2));

cityList.Add(new City(15, "普陀区", 3));

cityList.Add(new City(16, "黄浦区", 3));

cityList.Add(new City(17, "黄冈市", 4));

cityList.Add(new City(18, "荆州市", 4));

cityList.Add(new City(19, "长沙市", 5));

cityList.Add(new City(20, "岳阳市", 5));

cityList.Add(new City(21, "太原市", 6));

cityList.Add(new City(22, "大同市", 6));

List tempList = new List();

for (int i = 0; i 
{

if (cityList[i].StateId == stateId)

{

tempList.Add(cityList[i]);

}

}

return tempList;

}

}

/// 


/// 省份信息

/// 


public class State

{

private int stateId;

private string stateName;

/// 


/// 省份名

/// 


public string StateName

{

get { return stateName; }

set { stateName = value; }

}


/// 


/// 省份编号

/// 


public int StateId

{

get { return stateId; }

set { stateId = value; }

}

public State(int stateId, string stateName)

{

this.stateId = stateId;

this.stateName = stateName;

}

}

/// 


/// 城市信息

/// 


public class City

{

private int cityId;

private int stateId;

private string cityName;

/// 


/// 城市名称

/// 


public string CityName

{

get { return cityName; }

set { cityName = value; }

}


/// 


/// 城市所在省份编号

/// 


public int StateId

{

get { return stateId; }

set { stateId = value; }

}


/// 


/// 城市编号

/// 


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;

}


}