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19.2.6 类层次结构
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19.2.6 类层次结构
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165530.htm'>19.2.3 用户交互操作</a></div><div style='float:right;width:49%'>·<a href='100165531.htm'>19.2.4 Windows功能</a></div><div style='float:left;width:49%'>·<a href='100165532.htm'>19.2.5 杂项功能</a></div><div style='float:right;width:49%'>·<a href='100165534.htm'>19.3 标准控件和组件</a></div><div style='float:left;width:49%'>·<a href='100165535.htm'>19.3.1 Button控件</a></div><div style='float:right;width:49%'>·<a href='100165536.htm'>19.3.2 CheckBox控件</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt"><span lang="EN-US">19.2.6 </span><span style="FONT-FAMILY: 黑体">类层次结构</span></h3>
<p class="MsoNormal" style="LINE-HEIGHT: 17.6pt"><span style="FONT-FAMILY: 宋体">在本节的开头提到，</span><span lang="EN-US">Control</span><span style="FONT-FAMILY: 宋体">类是</span><span lang="EN-US">System.Windows.Forms</span><span style="FONT-FAMILY: 宋体">命名空间中大多数类的基类。还有一些类给</span><span lang="EN-US">Control</span><span style="FONT-FAMILY: 宋体">类添加了功能，以满足一些控件的需要。其中一个是</span><span lang="EN-US">System.Windows. Forms.ScrollableControl</span><span style="FONT-FAMILY: 宋体">类。顾名思义，</span><span lang="EN-US">ScrollableControl</span><span style="FONT-FAMILY: 宋体">添加了自动滚动的功能。这个类还增加了一些属性，例如</span><span lang="EN-US">AutoScroll</span><span style="FONT-FAMILY: 宋体">，如果把它设置为</span><span lang="EN-US">true</span><span style="FONT-FAMILY: 宋体">，而控件又包含看不到的其他控件，该控件就会自动添加滚动条。</span><span lang="EN-US">HScroll</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">VScroll</span><span style="FONT-FAMILY: 宋体">都是布尔值，确定是否显示水平滚动条或垂直滚</span><span lang="EN-US"> </span><span style="FONT-FAMILY: 宋体">动条。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17.6pt"><span lang="EN-US">ContainerControl</span><span style="FONT-FAMILY: 宋体">类派生于</span><span lang="EN-US">ScrollableControl</span><span style="FONT-FAMILY: 宋体">类，基于这个类的控件可以是其他控件的容器。</span><span lang="EN-US">Form</span><span style="FONT-FAMILY: 宋体">类派生于</span><span lang="EN-US">ContainerControl</span><span style="FONT-FAMILY: 宋体">类，</span><span lang="EN-US">UserControl</span><span style="FONT-FAMILY: 宋体">类也派生于</span><span lang="EN-US">ContainerControl</span><span style="FONT-FAMILY: 宋体">类。本章后面将介绍这两个类。</span></p>
<p class="MsoNormal" style="LINE-HEIGHT: 17.6pt"><span style="FONT-FAMILY: 宋体">图</span><span lang="EN-US">19-1</span><span style="FONT-FAMILY: 宋体">显示了</span><span lang="EN-US">Control</span><span style="FONT-FAMILY: 宋体">类的层次结构、它的超类和子类。</span></p>
<p align="center"><span lang="EN-US"><img height="595" src="19/image001.jpg" width="357" alt="" /></span></p>
<p style="FTEL: 8.15pt" align="center"><span style="FONT-FAMILY: 宋体">图</span><span lang="EN-US"> 19-1</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在设计和构造定制控件的过程中，理解该层次结构是非常重要的。如果定制控件派生于当前控件，例如要创建一个文本框，并添加一些属性和方法，就应从文本框控件中继承，再重写和添加属性和方法，以满足自己的要求。但是，如果创建的控件不匹配</span><span lang="EN-US">.NET Framework</span><span style="FONT-FAMILY: 宋体">提供的任何控件，就必须从</span><span lang="EN-US">3</span><span style="FONT-FAMILY: 宋体">个基类中派生：如果需要自动滚动功能，就从</span><span lang="EN-US">Control</span><span style="FONT-FAMILY: 宋体">或</span><span lang="EN-US">ScrollableControl</span><span style="FONT-FAMILY: 宋体">中派生，如果控件应是其他控件的容器，就应从</span><span lang="EN-US">ContainerControl</span><span style="FONT-FAMILY: 宋体">类中派生。</span></p></div>
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<div style='float:left;width:49%'>·<a href='100165530.htm'>19.2.3 用户交互操作</a></div><div style='float:right;width:49%'>·<a href='100165531.htm'>19.2.4 Windows功能</a></div><div style='float:left;width:49%'>·<a href='100165532.htm'>19.2.5 杂项功能</a></div><div style='float:right;width:49%'>·<a href='100165534.htm'>19.3 标准控件和组件</a></div><div style='float:left;width:49%'>·<a href='100165535.htm'>19.3.1 Button控件</a></div><div style='float:right;width:49%'>·<a href='100165536.htm'>19.3.2 CheckBox控件</a></div></div>
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