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来自「C#高级编程(第三版),顶死你们。。 。up」· HTM 代码 · 共 540 行 · 第 1/3 页
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protected System.Web.UI.WebControls.Label resultLabel;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
protected Service1 myService;</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>
protected bool authenticated;</span></p>
<p class=MsoNormal><span style='font-family:宋体'>现在在</span><span lang=EN-US>Page_Load()</span><span
style='font-family:宋体'>中初始化这个成员。有了一个标题和这个</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>服务后，就把它存储在窗体的</span><span lang=EN-US>ViewState</span><span
style='font-family:宋体'>集合中</span><span lang=EN-US>(</span><span
style='font-family:宋体'>这是在回调之间保存信息的一种有效方式，其工作方式类似于在应用程序或会话层存储信息</span><span
lang=EN-US>)</span><span style='font-family:宋体'>。</span><span lang=EN-US>Page_Load()</span><span
style='font-family:宋体'>确定是否有一个已存储的标题，并把该标题赋予代理</span><span lang=EN-US>(</span><span
style='font-family:宋体'>以这种方式赋予标题是把要发送的数据作为</span><span lang=EN-US>SOAP</span><span
style='font-family:宋体'>标题的惟一一步</span><span lang=EN-US>)</span><span
style='font-family:宋体'>。这样，调用的任何事件处理程序</span><span lang=EN-US>(</span><span
style='font-family:宋体'>例如</span><span lang=EN-US>Web</span><span
style='font-family:宋体'>方法调用按钮的事件处理程序</span><span lang=EN-US>)</span><span
style='font-family:宋体'>就不需要担心赋予标题的问题了<span style='letter-spacing:-1.0pt'>——</span></span><span
style='letter-spacing:-1.0pt'> </span><span style='font-family:宋体'>这一步已经完成了：</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> private void Page_Load(object sender,
System.EventArgs e)</span></p>
<p class=a6 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>
myService = new Service1();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
AuthenticationToken header = new AuthenticationToken();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
if (ViewState["AuthenticationTokenHeader"] != null)</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>
header.InnerToken = (Guid)ViewState["AuthenticationTokenHeader"];</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>
header.InnerToken = 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-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
myService.AuthenticationTokenValue = header;</span></p>
<p class=a6 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'>接着在设计器中双击</span><span
lang=EN-US>Log in</span><span style='font-family:宋体'>按钮，添加一个事件处理程序：</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> private void loginButton_Click(object
sender, System.EventArgs e)</span></p>
<p class=a6 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>
Guid authenticationTokenHeader = myService.Login(userNameBox.Text,</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
passwordBox.Text);</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
tokenLabel.Text = authenticationTokenHeader.ToString();</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
ViewState.Add("AuthenticationTokenHeader",
authenticationTokenHeader);</span></p>
<p class=a6 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'>这个处理程序使用在两个文本框中输入的数据调用</span><span
lang=EN-US>Login()</span><span style='font-family:宋体'>，显示返回的</span><span
lang=EN-US>Guid</span><span style='font-family:宋体'>，并把该</span><span lang=EN-US>Guid</span><span
style='font-family:宋体'>存储在</span><span lang=EN-US>ViewState</span><span
style='font-family:宋体'>集合中。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>最后，必须以相同的方式为</span><span
lang=EN-US>Invoke DoSomething()</span><span style='font-family:宋体'>按钮添加一个处理程序：</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> private void
invokeButton_Click(object sender, System.EventArgs e)</span></p>
<p class=a6 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>
resultLabel.Text = myService.DoSomething();</span></p>
<p class=a6 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'>这个处理程序仅输出由</span><span
lang=EN-US>DoSomething()</span><span style='font-family:宋体'>返回的文本。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>在运行这个应用程序时，可以直接按下</span><span
lang=EN-US>Invoke DoSomething()</span><span style='font-family:宋体'>按钮，因为</span><span
lang=EN-US>Page_Load()</span><span style='font-family:宋体'>已经赋予了正确的标题</span><span
lang=EN-US>(</span><span style='font-family:宋体'>如果没有赋予标题，就会产生一个异常，因为已经指定这个方法必须有一个标题</span><span
lang=EN-US>)</span><span style='font-family:宋体'>。这会使</span><span lang=EN-US>DoSomething()</span><span
style='font-family:宋体'>返回一个失败消息，如图</span><span lang=EN-US>26-4</span><span
style='font-family:宋体'>所示。</span></p>
<p align=center style='margin-top:3.25pt'><span lang=EN-US><img border=0 width=296
height=212 src="26/image004.jpg"></span></p>
<p align=center style='FTEL:8.15pt'><span style='font-family:宋体'>图</span><span
lang=EN-US> 26-4</span></p>
<p class=MsoNormal><span style='font-family:宋体'>如果试着用除</span><span lang=EN-US>Karli</span><span
style='font-family:宋体'>和</span><span lang=EN-US>Cheese</span><span
style='font-family:宋体'>之外的任何用户名和密码登录，就会得到相同的结果。但如果使用这些证书进行登录，接着调用</span><span
lang=EN-US>DoSomething()</span><span style='font-family:宋体'>，就会获得成功的消息。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>此外，还可以看到</span><span
lang=EN-US>Guid</span><span style='font-family:宋体'>用于验证有效性的字符串表示。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>当然，使用这种技术通过</span><span
lang=EN-US>SOAP</span><span style='font-family:宋体'>标题交换数据的应用程序可能会复杂得多。它们需要以比应用层变量更敏感的方式存储登录标识，例如存储在数据库中。为了完整起见，也可以在到达某个时刻时使这些标识过期，给用户提供注销功能，即删除标识。甚至可以对用户使用的</span><span
lang=EN-US>IP</span><span style='font-family:宋体'>地址验证标识，获得进一步的安全性。但此处的关键是用户的用户名和密码只发送一次，然后使用</span><span
lang=EN-US>SOAP</span><span style='font-family:宋体'>标题简化以后的方法调用。</span></p>
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<h1 id="divCurrentNode2" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165697.htm'><font color='red'>26.5 使用SOAP标题交换数据</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165694.htm'>26.4 扩充会议登记示例</a></div><div style='float:right;width:49%'>·<a href='100165695.htm'>26.4.1 会议登记 Web服务</a></div><div style='float:left;width:49%'>·<a href='100165696.htm'>26.4.2 会议登记客户程序</a></div><div style='float:right;width:49%'>·<a href='100165698.htm'>26.6 小结</a></div><div style='float:left;width:49%'>·<a href='100165699.htm'>27.1 用户控件</a></div><div style='float:right;width:49%'>·<a href='100165700.htm'>27.2 定制控件</a></div></div>
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