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27.3.4 测试民意的投票控件
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C#高级编程（第3版）
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27.3.4 测试民意的投票控件
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2006-10-13 14:41:00
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<h1 id="divCurrentNode" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165708.htm'><font color='red'>27.3.4 测试民意的投票控件</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165705.htm'>27.3.1 Candidate 控件</a></div><div style='float:right;width:49%'>·<a href='100165706.htm'>27.3.2 StrawPoll控件构建器</a></div><div style='float:left;width:49%'>·<a href='100165707.htm'>27.3.3 测试民意的投票类型</a></div><div style='float:right;width:49%'>·<a href='100165709.htm'>27.4 小结</a></div></div>
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<link href="css.css" rel="stylesheet" type="text/css" /><h3 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;margin-left:
0cm'><span lang=EN-US>27.3.4 </span><span style='font-family:黑体'>测试民意的投票控件</span></h3>
<p class=MsoNormal style='line-height:18.0pt'><span style='font-family:宋体'>现在可以把上面所进行的讨论综合起来。首先，定义两个属性</span><span
lang=EN-US>Title</span><span style='font-family:宋体'>和</span><span lang=EN-US>PollStyle</span><span
style='font-family:宋体'>，其中</span><span lang=EN-US>Title</span><span
style='font-family:宋体'>用于显示控件的标题，</span><span lang=EN-US>PollStyle</span><span
style='font-family:宋体'>用于保存枚举的显示类型。为了保持永久性，这两个属性都使用</span><span lang=EN-US>ViewState</span><span
style='font-family:宋体'>：</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> [
ControlBuilderAttribute(typeof(StrawPollControlBuilder)) ]</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> [ ParseChildren(false) ]</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> public class StrawPoll :
System.Web.UI.WebControls.WebControl,</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US>
INamingContainer</span></p>
<p class=a6 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> public string Title</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> get</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US>
object rawTitle = ViewState["_title"];</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US>
if (rawTitle != null)</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US>
return (string)rawTitle;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> }</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US>
else</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> {</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US>
ViewState["_title"] = "Straw Poll";</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US>
return "Straw Poll";</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> }</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> }</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt;line-height:14.5pt'><span
lang=EN-US> set</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>
ViewState["_title"] = value;</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>
}</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>
public pollStyle PollStyle</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>
get</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>
object rawPollStyle = ViewState["_pollStyle"];</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
if (rawPollStyle != 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>
return (pollStyle)rawPollStyle;</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>
ViewState["_pollStyle"] = pollStyle.voteandvalues;</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
return pollStyle.voteandvalues;</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>
}</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
set</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>
ViewState["_pollStyle"] = value;</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>
}</span></p>
<p class=a6 style='margin-top:0cm;margin-right:0cm;FTEL:11.4pt;
margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US> }</span></p>
<p class=MsoNormal style='line-height:18.0pt'><span style='font-family:宋体'>这个类的其余部分为</span><span
lang=EN-US>Render()</span><span style='font-family:宋体'>方法。</span><span
lang=EN-US>Render()</span><span style='font-family:宋体'>方法通过考虑所使用的投票类型，将显示整个测试民意的投票控件和它的所有选项。调用</span><span
lang=EN-US>Candidate</span><span style='font-family:宋体'>子控件的</span><span
lang=EN-US>RenderControl()</span><span style='font-family:宋体'>方法可以显示投票按钮，使用</span><span
lang=EN-US>Candidate</span><span style='font-family:宋体'>子控件的</span><span
lang=EN-US>Votes</span><span style='font-family:宋体'>属性生成简单的</span><span
lang=EN-US>HTML</span><span style='font-family:宋体'>，可以以图形和数字的方式显示投票的情况。代码</span><span
lang=EN-US>(</span><span style='font-family:宋体'>包含清楚的注释</span><span lang=EN-US>)</span><span
style='font-family:宋体'>如下：</span></p>
<p class=2 style='margin-top:9.8pt;margin-right:0cm;FTEL:0cm;
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