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margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>

<p class=MsoNormal><span style='font-family:宋体'>这里使用</span><span lang=EN-US>Controls</span><span
style='font-family:宋体'>的</span><span lang=EN-US>Add()</span><span
style='font-family:宋体'>方法进行合理的设置。此外，也为按钮添加了一个事件处理程序，以使它循环颜色。处理程序如下：</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>&nbsp;&nbsp; protected void cycleButton_Click(object sender,
System.EventArgs e)</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;
{</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
rainbowLabel.Cycle();</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>&nbsp;&nbsp; }</span></p>

<p class=MsoNormal><span style='font-family:宋体'>这个调用可以使标签颜色循环发生变化。</span></p>

<p class=MsoNormal><span style='font-family:宋体'>为了让合成控件的用户可以访问</span><span
lang=EN-US>RainbowLabel</span><span style='font-family:宋体'>子控件中的文本，可以添加一个属性，使它映射到子控件的</span><span
lang=EN-US>Text</span><span style='font-family:宋体'>属性上：</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>&nbsp;&nbsp; public string Text</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;
{</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
get</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
{</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return rainbowLabel.Text;</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
set</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
{</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
rainbowLabel.Text = value;</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</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>&nbsp;&nbsp; }</span></p>

<p class=MsoNormal><span style='font-family:宋体'>最后需要执行</span><span lang=EN-US>Render()</span><span
style='font-family:宋体'>。这个方法的基本实现需要类的</span><span lang=EN-US>Controls</span><span
style='font-family:宋体'>集合中的每个控件，让它们显示出来。因为</span><span lang=EN-US>Render()</span><span
style='font-family:宋体'>是一个受保护的方法，所以不能调用每个控件的</span><span lang=EN-US>Render()</span><span
style='font-family:宋体'>方法，而是调用公共方法</span><span lang=EN-US>RenderControl()</span><span
style='font-family:宋体'>，这会得到相同的效果，因为</span><span lang=EN-US>RenderControl()</span><span
style='font-family:宋体'>调用</span><span lang=EN-US>Render()</span><span
style='font-family:宋体'>方法，所以不必再修改</span><span lang=EN-US>RainbowLabel</span><span
style='font-family:宋体'>类中的任何代码。为了对此进行更多的控制</span><span lang=EN-US>(</span><span
style='font-family:宋体'>例如控制合成控件输出由子控件生成的</span><span lang=EN-US>HTML)</span><span
style='font-family:宋体'>，可以自己调用这些方法：</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>&nbsp;&nbsp; protected override void Render(HtmlTextWriter output)</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;
{</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
rainbowLabel.RenderControl(output);</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
cycleButton.RenderControl(output);</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>&nbsp;&nbsp; }</span></p>

<p class=MsoNormal><span style='font-family:宋体'>只需要把接收到的</span><span
lang=EN-US>HtmlText Writer</span><span style='font-family:宋体'>实例传递给子控件的</span><span
lang=EN-US>RenderControl()</span><span style='font-family:宋体'>方法，子控件生成的</span><span
lang=EN-US>HTML</span><span style='font-family:宋体'>就会显示出来。</span></p>

<p class=MsoNormal><span style='font-family:宋体'>这个控件的使用方法与</span><span
lang=EN-US>RainbowLabel</span><span style='font-family:宋体'>的使用方法大致相同：</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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;form method=&quot;post&quot;
runat=&quot;server&quot; ID=&quot;Form1&quot;&gt;</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&lt;PCS:RainbowLabel2 Runat=&quot;server&quot;</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Text=&quot;Multicolored label composite&quot;</span></p>

<p class=2 style='margin-left:21.45pt;FTEL:18.45pt'><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
ID=&quot;rainbowLabel2&quot;/&gt;</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>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&lt;/form&gt;</span></p>

<p class=MsoNormal><span style='font-family:宋体'>这次包含循环颜色的按钮。</span></p>

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