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Microsoft Asp.Net Ajax框架入门(12) 了解异步通信层

發布時間：2023/12/31 asp.net 38 豆豆

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VS 2008

本文通過兩個簡單的例子，了解Asp.Net Ajax Asynchronous Communication Layer

Asp.Net Ajax異步通信層提供了一系列客戶端的類，用于客戶端請求服務端

第一個例子：請求服務端頁面
1）被請求頁 Ajax_GetUserName.aspx
????html代碼僅留頁面聲明，其余全部清楚：
<%@?Page?Language="C#"?AutoEventWireup="true"?CodeFile="Ajax_GetUserName.aspx.cs"?Inherits="Ajax_GetUserName"?%>
????Ajax_GetUserName.aspx.cs頁面寫處理邏輯：
public?partial?class?Ajax_GetUserName?:?System.Web.UI.Page
{
????protected?void?Page_Load(object?sender,?EventArgs?e)
????{
????????if?(Request.QueryString["userId"]?==?"1")?{
????????????Response.Write("guozhijian");
????????}
????????else?{
????????????Response.Write(string.Empty);
????????}
????}
}
2）客戶端請求

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

<!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?runat="server">
????<title>Untitled?Page</title>
????<script?type="text/javascript">
????????function?btnGetNameClickHandler()?{
????????????var?req?=?new?Sys.Net.WebRequest();
????????????req.set_url("Ajax_GetUserName.aspx?userId=1");
????????????req.add_completed(requestCompleted);
????????????req.invoke();
????????}
????????function?requestCompleted(executor,?eventArgs)?{
????????????if(executor.get_statusCode()?==?200)?{
????????????????alert(executor.get_responseData());
????????????}
????????}
????</script>
</head>
<body>
????<form?id="form1"?runat="server">
????<asp:ScriptManager?ID="smgr"?runat="server"></asp:ScriptManager>
????<div>
????????<input?type="button"?id="btnGetName"?onclick="btnGetNameClickHandler()"?value="get?name"?/>
????</div>
????</form>
</body>
</html>
第二個例子：請求XML文檔
1）新建UserInfos.xml

<?xml?version="1.0"?encoding="utf-8"??>
<userInfos>
??<userInfo>
????<userId>1</userId>
????<userName>guozhijian</userName>
??</userInfo>
??<userInfo>
????<userId>2</userId>
????<userName>zhenglanzhen</userName>
??</userInfo>
</userInfos>
2）客戶端請求

function?btnGetXmlClickHandler()?{
????????????var?req?=?new?Sys.Net.WebRequest();
????????????req.set_url("UserInfos.xml");
????????????req.add_completed(getXmlCompleted);
????????????req.invoke();????
????????}
????????function?getXmlCompleted(executor,?eventArgs)?{
????????????if(executor.get_statusCode()?==?200)?{
????????????????alert(executor.get_xml().xml);
????????????}
????????}

轉載于:https://www.cnblogs.com/guozhijian/archive/2008/02/17/1071469.html

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