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27.3 测验民意的投票控件
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C#高级编程（第3版）
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27.3 测验民意的投票控件
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165701.htm'>27.2.1 定制控件的项目配置</a></div><div style='float:right;width:49%'>·<a href='100165702.htm'>27.2.2 基本的定制控件</a></div><div style='float:left;width:49%'>·<a href='100165703.htm'>27.2.3 创建合成的定制控件</a></div><div style='float:right;width:49%'>·<a href='100165705.htm'>27.3.1 Candidate 控件</a></div><div style='float:left;width:49%'>·<a href='100165706.htm'>27.3.2 StrawPoll控件构建器</a></div><div style='float:right;width:49%'>·<a href='100165707.htm'>27.3.3 测试民意的投票类型</a></div></div>
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<link href="css.css" rel="stylesheet" type="text/css" /><h3 style='margin-top:11.4pt;margin-right:0cm;FTEL:11.4pt;margin-left:
0cm'><span lang=EN-US>27.3 </span><span style='font-family:楷体_GB2312'>测验民意的投票控件</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>接下来就使用前面讨论的技术开发一个比较复杂的定制控件。其结果将启用下面的</span><span
lang=EN-US>ASP.NET</span><span style='font-family:宋体'>代码，得到如图</span><span
lang=EN-US>27-11</span><span style='font-family:宋体'>所示的结果：</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> <form method="post"
runat="server" ID="Form1"></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<PCS:StrawPoll Runat="server" ID="strawPoll1"</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
PollStyle="voteonly"</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
Title="Who is your favorite James Bond?"></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<PCS:Candidate FTEL="Sean Connery" Votes="101"/></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<PCS:Candidate FTEL="Roger Moore" Votes="83"/></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<PCS:Candidate FTEL="George Lazenby" Votes="32"/></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<PCS:Candidate FTEL="Timothy Dalton" Votes="28"/></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
<PCS:Candidate FTEL="Pierce Brosnan" Votes="95"/></span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
</PCS:StrawPoll></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>
</form></span></p>
<p align=center><span lang=EN-US><img width=340 height=236
src="27/image011.jpg"></span></p>
<p align=center style='FTEL:8.15pt'><span style='font-family:宋体'>图</span><span
lang=EN-US> 27-11</span></p>
<p class=MsoNormal><span style='font-family:宋体'>当单击</span><span lang=EN-US>Vote</span><span
style='font-family:宋体'>按钮时，界面会改为显示测验民意的投票控件，如图</span><span lang=EN-US>27-12</span><span
style='font-family:宋体'>所示。</span></p>
<p align=center><span lang=EN-US><img width=340 height=300
src="27/image012.jpg"></span></p>
<p align=center style='FTEL:8.15pt'><span style='font-family:宋体'>图</span><span
lang=EN-US> 27-12</span></p>
<p class=MsoNormal><span style='font-family:宋体;letter-spacing:.1pt'>另外，可以同时看到结果和投票按钮，并且允许多次投票，这主要是为了测试。</span></p>
<p class=MsoNormal><span lang=EN-US>ASP.NET</span><span style='font-family:
宋体'>代码设置每个</span><span lang=EN-US>Candidate</span><span style='font-family:
宋体'>的</span><span lang=EN-US>Name</span><span style='font-family:宋体'>和</span><span
lang=EN-US>Votes</span><span style='font-family:宋体'>属性。虽然可以预知这个控件的更高级版本将以数据绑定的方式得到这些结果，但是，对于这个示例来说，这样做还是很好的。本章不讨论这方面的内容，因为它们比较复杂。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>在分析</span><span lang=EN-US>ASP.NET</span><span
style='font-family:宋体'>代码时，将以一致的方式解释与这个结构类似的结构：即在与父控件相关的控件构建器类中以指定的方式解释每个子元素。这个控件构建器处理所有嵌套在控件中的内容，包括文字正文。下面将会介绍这个构建器的代码。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>需要创建的两个控件是</span><span
lang=EN-US>Candidate</span><span style='font-family:宋体'>和</span><span
lang=EN-US>StrawPoll</span><span style='font-family:宋体'>，其中</span><span
lang=EN-US>Candidate</span><span style='font-family:宋体'>用于容纳各个候选人，</span><span
lang=EN-US>StrawPoll</span><span style='font-family:宋体'>用于包含和显示测试民意的投票控件。这两个控件都放在新的源文件</span><span
lang=EN-US>Candidate.cs</span><span style='font-family:宋体'>和</span><span
lang=EN-US>StrawPoll.cs</span><span style='font-family:宋体'>中。</span></p>
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<div style='float:left;width:49%'>·<a href='100165701.htm'>27.2.1 定制控件的项目配置</a></div><div style='float:right;width:49%'>·<a href='100165702.htm'>27.2.2 基本的定制控件</a></div><div style='float:left;width:49%'>·<a href='100165703.htm'>27.2.3 创建合成的定制控件</a></div><div style='float:right;width:49%'>·<a href='100165705.htm'>27.3.1 Candidate 控件</a></div><div style='float:left;width:49%'>·<a href='100165706.htm'>27.3.2 StrawPoll控件构建器</a></div><div style='float:right;width:49%'>·<a href='100165707.htm'>27.3.3 测试民意的投票类型</a></div></div>
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