ASP.NET2.0中用ICallbackEventHandler實現用戶端與伺服器端非同步互動

頁面代碼:
<script type="text/javascript">
      function ReceiveServerData(rValue)
      {
         alert(rValue);
      }
 </script>
<input id="Button1" type="button" value="button" onclick ="CallServer('Client')" />
服務端代碼:public partial class back2 : System.Web.UI.Page,System .Web .UI .ICallbackEventHandler 
{
    public string CallBackValue = null;
    protected void Page_Load(object sender, EventArgs e)
    {

    }
     // 註冊指令碼到前台頁面
    protected void Page_PreRender(object sender, EventArgs e)
    {
        RegClientScript();
    }
    // javascript函數(伺服器端事件的用戶端回調)
    protected void RegClientScript()
    {
       ClientScriptManager cs = Page.ClientScript;
       string jstxt=@" 
                  function CallServer(msgid)
                  {
                     " + cs.GetCallbackEventReference(this, "msgid", "ReceiveServerData", null) + @";
                  }";
       cs.RegisterStartupScript(this.GetType(), "callserver", jstxt, true);
    }
    //ICallbackEventHandler介面
    //把值傳到前台
    string ICallbackEventHandler.GetCallbackResult()
    {
        return CallBackValue + ",Server";
    }

    //按受前台的參數
    void ICallbackEventHandler.RaiseCallbackEvent(string eventArgument)
    {
        this.CallBackValue = eventArgument;
    }
}

運行結果: (實現非同步互動,頁面不重新整理)