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客户端回调实现 (C#) 示例

2008-04-20 16:22 330 查看
演示实现客户端回调的 ASP.NET 网页

说明

下面的代码示例分为两部分。示例的第一部分演示一个 ASP.NET 网页（.aspx 页）。第二部分演示相应的代码隐藏文件（.aspx.cs 文件）。




<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>




<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">




<html xmlns="http://www.w3.org/1999/xhtml" >


<head id="Head1" runat="server">


<script type="text/javascript">




Function LookUpStock()function LookUpStock()


{


var lb = document.forms[0].ListBox1;


var product = lb.options[lb.selectedIndex].text


CallServer(product, "");


}







Function ReceiveServerData()function ReceiveServerData(rValue)


{


Results.innerText = rValue;


}


</script>


</head>


<body>


<form id="form1" runat="server">


<div>


<asp:ListBox ID="ListBox1" Runat="server"></asp:ListBox>


<br />


<br />


<button onclick="LookUpStock()">Look Up Stock</button>


<br />


<br />


Items in stock: <span ID="Results"></span>


<br />


</div>


</form>


</body>


</html>








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 Default3 : System.Web.UI.Page, System.Web.UI.ICallbackEventHandler




...{


protected System.Collections.Specialized.ListDictionary catalog;


private 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();


}




public void RaiseCallbackEvent(String eventArgument)




...{


if (catalog[eventArgument] == null)




...{


returnValue = "-1";


}


else




...{


returnValue = catalog[eventArgument].ToString();


}


}






public string GetCallbackResult()




...{


return returnValue;


}




}

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