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4.2 实现的继承
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C#高级编程（第3版）【全文连载】
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4.2 实现的继承
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2006-10-13 14:50:00
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<div style='float:left;width:49%'>·<a href='100165814.htm'>32.7 电源事件</a></div><div style='float:right;width:49%'>·<a href='100165815.htm'>32.8 小结</a></div><div style='float:left;width:49%'>·<a href='100165816.htm'>4.1 继承的类型</a></div><div style='float:right;width:49%'>·<a href='100165818.htm'>4.3 修饰符</a></div><div style='float:left;width:49%'>·<a href='100165819.htm'>4.4 接口</a></div><div style='float:right;width:49%'>·<a href='100165826.htm'>4.5 小结</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><p class="MsoNormal"><span style="FONT-FAMILY: 宋体">如果要声明一个类派生于另一个类，可以使用下面的语法：</span></p>
<p class="2" style="MARGIN: 8.15pt 0cm 0pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">class MyDerivedClass : MyBaseClass</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">{</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> // functions and data members here</span></p>
<p class="2" style="MARGIN: 0cm 0cm 8.15pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">}</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 黑体">注意：</span></p>
<p class="a1" style="MARGIN-BOTTOM: 8.15pt; TEXT-INDENT: 21.45pt"><span style="FONT-FAMILY: 楷体_GB2312">这个语法非常类似于</span><span lang="EN-US">C++</span><span style="FONT-FAMILY: 楷体_GB2312">和</span><span lang="EN-US">Java</span><span style="FONT-FAMILY: 楷体_GB2312">中的语法，但是，</span><span lang="EN-US">C++</span><span style="FONT-FAMILY: 楷体_GB2312">程序员习惯于使用公共和私有继承的概念，要注意</span><span lang="EN-US">C#</span><span style="FONT-FAMILY: 楷体_GB2312">不支持私有继承，因此基类名上没有</span><span lang="EN-US">public</span><span style="FONT-FAMILY: 楷体_GB2312">或</span><span lang="EN-US">private</span><span style="FONT-FAMILY: 楷体_GB2312">限定符。支持私有继承会大大增加语言的复杂性，实际上私有继承在</span><span lang="EN-US">C++</span><span style="FONT-FAMILY: 楷体_GB2312">中也很少使用。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">如果类</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">或结构</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">也派生于接口，则用逗号分隔开基类和接口：</span></p>
<p class="2" style="MARGIN: 8.15pt 0cm 0pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">public class MyDerivedClass : MyBaseClass, IInterface1, IInterface2</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">{</span></p>
<p class="2" style="MARGIN: 0cm 0cm 8.15pt 21.45pt; TEXT-INDENT: 60.3pt"><span lang="EN-US">//etc.</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">对于结构，语法如下：</span></p>
<p class="2" style="MARGIN: 8.15pt 0cm 0pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">public struct MyDerivedStruct : IInterface1, IInterface2</span></p>
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