default.aspx.cs

AJAX入门２０例之２

using System;
using System.Data;
using System.Configuration;
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;

public partial class _Default : System.Web.UI.Page,ICallbackEventHandler 
{
    private string _data;
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    #region ICallbackEventHandler 成员

    public string GetCallbackResult()
    {
        //返回处理后的数据
        return _data;
    }

    public void RaiseCallbackEvent(string eventArgument)
    {
        //判断传递过来的参数
        switch (eventArgument)
        {
            case "北京":
                _data = "朝阳,海淀,东城,西城";
                break;
            case "上海":
                _data = "浦东,静安,徐汇,虹口";
                break;
            case "济南":
                _data = "历城,历下,市中,天桥";
                break;
        }
    }

    #endregion
}