Services用来管理对WebService的调用，通过<asp:ServiceReference>标签可以在Services中注册一个WebService，在运行时ScriptManager将为每一个ServiceReference对象生成一个客户端代理，<asp:ServiceReference>标签一个很重要的属性是Path，用来指定WebService的路径，如下所示：
<asp:ScriptManager ID="SM1" runat="server"> <Services> <asp:ServiceReference Path="Service.asmx"/> </Services></asp:ScriptManager>看一个简单的调用WebService的例子：
WebService如下，注意在WebServiceSample上加ScriptService特性：
[ScriptService]
public class WebServiceSample : System.Web.Services.WebService {
public WebServiceSample()
{
//Uncomment the following line if using designed components //InitializeComponent(); 
} [WebMethod] public string EchoString(String s) { return "Hello " + s; }
}ASPX页面：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><script type="text/javascript" language="JavaScript"> function OnbuttonGo_click() { requestSimpleService = WebServiceSample.EchoString( document.getElementById('inputName').value, //params OnRequestComplete //Complete event ); return false; } function OnRequestComplete(result) { alert(result); }</script><body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> <Services> <asp:ServiceReference Path="WebServiceSample.asmx"/> </Services> </asp:ScriptManager> <div> <input type="text" id="inputName" size=20/> <input id="button" type="button" value="调 用" onclick="return OnbuttonGo_click()" /></div> </form></body></html>运行后效果如下：
当然了也可以在运行时动态的在Services中加入ServiceReference，下面看一个运行时动态加入ServiceReference的例子：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %><script runat="server"> void Page_Load(object sender, EventArgs e) { ServiceReference sr = new ServiceReference(); sr.Path = "WebServiceSample.asmx"; ScriptManager1.Services.Add(sr); }</script><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title></head><script type="text/javascript" language="JavaScript"> function OnbuttonGo_click() { requestSimpleService = WebServiceSample.EchoString( document.getElementById('inputName').value, //params OnRequestComplete //Complete event ); return false; } function OnRequestComplete(result) { alert(result); }</script> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <div> <input type="text" id="inputName" size=20/> <input id="button" type="button" value="调 用" onclick="return OnbuttonGo_click()" /></div> </form></body></html>可以看到运行后和在ScriptManager中直接加入的效果是一样的。
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