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}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
else</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Application["currentUser"] = Guid.Empty;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
return Guid.Empty;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=MsoNormal><span style='font-family:宋体'>如果使用了正确的用户名和密码，就会生成一个新的</span><span
lang=EN-US>Guid</span><span style='font-family:宋体'>，它存储在应用程序级的变量中，并返回给用户。如果身份验证失败，就返回一个空的</span><span
lang=EN-US>Guid</span><span style='font-family:宋体'>，该</span><span lang=EN-US>Guid</span><span
style='font-family:宋体'>存储在应用层。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>接着是一个接收标题的方法，标题用</span><span
lang=EN-US>SoapHeaderAttribute</span><span style='font-family:宋体'>属性指定：</span></p>
<p class=2 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span
lang=EN-US> [WebMethod]</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
[SoapHeaderAttribute("AuthenticationTokenHeader",</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Direction = SoapHeaderDirection.In]</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
public string DoSomething()</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
if (Application["currentUser"] = ! null &&</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:69.7pt'><span lang=EN-US>AuthenticationTokenHeader
= ! null && </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:69.7pt'><span lang=EN-US>(AuthenticationTokenHeader.InnerToken</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
== (Guid)Application["currentUser"]) </span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
return "Authentication OK.";</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
else</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
return "Authentication failed.";</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=2 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
}</span></p>
<p class=MsoNormal><span style='font-family:宋体'>这将根据</span><span lang=EN-US>AuthenticationTokenHeader</span><span
style='font-family:宋体'>标题是否存在，是否是空的</span><span lang=EN-US>Guid</span><span
style='font-family:宋体'>，返回两个字符串中的一个</span><span lang=EN-US>(</span><span
style='font-family:宋体'>此时存在</span><span lang=EN-US>Application</span><span
style='font-family:宋体'>变量</span><span lang=EN-US>)</span><span
style='font-family:宋体'>，并匹配存储在</span><span lang=EN-US>Application["currentUser"]</span><span
style='font-family:宋体'>中的一个字符串。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>为了使用上述代码，需要给</span><span
lang=EN-US>Service1.asmx.cs</span><span style='font-family:宋体'>添加一个</span><span
lang=EN-US>using</span><span style='font-family:宋体'>语句：</span></p>
<p class=2 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US> using
System.Web.Services.Protocols;</span></p>
<p class=MsoNormal><span style='font-family:宋体'>在</span><span lang=EN-US>AuthenticationToken.cs</span><span
style='font-family:宋体'>中也添加了这个</span><span lang=EN-US>using</span><span
style='font-family:宋体'>语句。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>接着需要创建一个简单的客户程序，测试该服务。创建一个新的</span><span
lang=EN-US>Web</span><span style='font-family:宋体'>应用程序</span><span lang=EN-US>PCSWebClient3</span><span
style='font-family:宋体'>，给用户界面使用下面的简单代码：</span></p>
<p class=2 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span
lang=EN-US><form id="Form1" method="post"
runat="server"></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
User Name:</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<asp:TextBox Runat="server" ID="userNameBox"
/><br></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Password:</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<asp:TextBox Runat="server" ID="passwordBox"
/><br></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<asp:Button Runat="server" ID="loginButton"
Text="Log in" /><br></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<asp:Label Runat="server" ID="tokenLabel"
/><br></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<asp:Button Runat="server" ID="invokeButton"
Text="Invoke DoSomething()" /><br></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<asp:Label Runat="server" ID="resultLabel"
/><br></span></p>
<p class=2 style='margin-top:0cm;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US></form></span></p>
<p class=MsoNormal><span style='font-family:宋体'>把</span><span lang=EN-US>PCSWebSrv3</span><span
style='font-family:宋体'>服务添加为一个</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>引用，名称为</span><span lang=EN-US>authenticateService</span><span
style='font-family:宋体'>，再把下面的</span><span lang=EN-US>using</span><span
style='font-family:宋体'>语句添加到</span><span lang=EN-US>WebForm1.aspx.cs</span><span
style='font-family:宋体'>中：</span></p>
<p class=2 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>using
PCSWebClient3.authenticateService;</span></p>
<p class=MsoNormal><span style='font-family:宋体'>下面将使用一个受保护的成员来存储</span><span
lang=EN-US>Web</span><span style='font-family:宋体'>引用代理，用另一个成员存储一个布尔值，表示用户是否通过了身份验证：</span></p>
<p class=a6 style='margin-top:8.15pt;margin-right:0cm;FTEL:0cm;
margin-left:21.45pt;FTEL:.0001pt;FTEL:18.45pt'><span
lang=EN-US> public class WebForm1 : System.Web.UI.Page</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
{</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
protected System.Web.UI.WebControls.TextBox userNameBox;</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
protected System.Web.UI.WebControls.TextBox passwordBox;</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
protected System.Web.UI.WebControls.Button loginButton;</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
protected System.Web.UI.WebControls.Label tokenLabel;</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
protected System.Web.UI.WebControls.Button invokeButton;</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
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