callback.aspx.cs

《圣殿祭司的ASP.NET 2.0开发详解——使用C#》光盘内容.包含了书籍所含的源代码.非常经典的一本asp.net2.0的书籍

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 ClientCallback : System.Web.UI.Page,System.Web.UI.ICallbackEventHandler
{
	protected System.Collections.Specialized.ListDictionary catalog;
	protected string returnValue;

	protected void Page_Load(object sender, EventArgs e)
	{
		String cbReference =Page.ClientScript.GetCallbackEventReference(this,"arg", "ReceiveServerData", "context");
		String callbackScript;
		callbackScript = "function CallServer(arg, context)" +"{ " + cbReference + "} ;";
		Page.ClientScript.RegisterClientScriptBlock(this.GetType(),"CallServer", callbackScript, true);

		catalog = new System.Collections.Specialized.ListDictionary();
		catalog.Add("monitor", 12);
		catalog.Add("laptop", 10);
		catalog.Add("keyboard", 23);
		catalog.Add("mouse", 17);

		ListBox1.DataSource = catalog;
		ListBox1.DataTextField = "key";
		ListBox1.DataBind();
	}

	//引发Callback事件
	public void RaiseCallbackEvent(String eventArgument)
	{
		if (catalog[eventArgument] == null)
		{
			returnValue = "-1";
		}
		else
		{
			returnValue = catalog[eventArgument].ToString();
		}
	}

	//返回Callback结果
	public string GetCallbackResult()
	{
		return returnValue;
	}
}