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27.3.1 Candidate 控件
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C#高级编程（第3版）
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27.3.1 Candidate 控件
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165702.htm'>27.2.2 基本的定制控件</a></div><div style='float:right;width:49%'>·<a href='100165703.htm'>27.2.3 创建合成的定制控件</a></div><div style='float:left;width:49%'>·<a href='100165704.htm'>27.3 测验民意的投票控件</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='100165708.htm'>27.3.4 测试民意的投票控件</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>27.3.1 Candidate </span><span style='font-family:
黑体'>控件</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>首先，创建一些</span><span lang=EN-US>Candidate</span><span
style='font-family:宋体'>控件，每个</span><span lang=EN-US>Candidate</span><span
style='font-family:宋体'>控件都存储候选人名和投给该候选人的选票数。此外，这些控件维护投票按钮，并且处理对按钮的单击。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>对于这个项目，需要：</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></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</span><span lang=EN-US>(</span><span
style='font-family:宋体'>保存在</span><span lang=EN-US>ViewState</span><span
style='font-family:宋体'>中</span><span lang=EN-US>)</span><span style='font-family:
宋体'>的代码</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
lang=EN-US>CreateChildControls()</span><span style='font-family:宋体'>中的初始化代码</span></p>
<p class=1 style='margin-left:37.55pt;FTEL:-16.1pt'><span lang=EN-US>●<span
style='font:7.0pt "Times New Roman"'> </span></span><span
style='font-family:宋体'>按钮单击处理程序的代码</span></p>
<p class=MsoNormal><span style='font-family:宋体'>此外，还包括一个实用方法</span><span
lang=EN-US>Increment()</span><span style='font-family:宋体'>，它用于给</span><span
lang=EN-US>Candidate</span><span style='font-family:宋体'>实例的当前选票数增加选票。按钮单击处理程序会调用这个方法。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>我们还需要支持</span><span lang=EN-US>INamingContainer</span><span
style='font-family:宋体'>，因为会有</span><span lang=EN-US>Candidate</span><span
style='font-family:宋体'>控件和其子控件的多个实例。</span></p>
<p class=MsoNormal><span style='font-family:宋体'>类</span><span lang=EN-US>Candidate</span><span
style='font-family:宋体'>的代码将放入到</span><span lang=EN-US>Candidate.cs</span><span
style='font-family:宋体'>文件中。在每次使用前面介绍过的</span><span lang=EN-US>RainbowLabel</span><span
style='font-family:宋体'>控件时，除了应该把标准的命名空间和</span><span lang=EN-US>using</span><span
style='font-family:宋体'>语句添加给项目外，还应该把</span><span lang=EN-US>Candidate.cs</span><span
style='font-family:宋体'>文件添加给项目。代码如下：</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> public class Candidate :
System.Web.UI.WebControls.WebControl,</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
INamingContainer</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 string Name</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 rawName =
ViewState["_name"];</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
if (rawName != 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 (string)rawName;</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["_name"] = "Candidate";</span></p>
<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>
return "Candidate";</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["_name"] = 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>
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