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3.4 Object类
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C#高级编程（第3版）【全文连载】
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3.4 Object类
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2006-8-17 16:57:00
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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='100162756.htm'><font color='red'>3.4 Object类</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100162753.htm'>3.1 类和结构</a></div><div style='float:right;width:49%'>·<a href='100162754.htm'>3.2 类成员</a></div><div style='float:left;width:49%'>·<a href='100162755.htm'>3.3 结构</a></div><div style='float:right;width:49%'>·<a href='100162757.htm'>3.5 小结</a></div><div style='float:left;width:49%'>·<a href='100165324.htm'>目录</a></div><div style='float:right;width:49%'>·<a href='100165325.htm'>译者序</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><p class="MsoNormal"><span><span style="FONT-FAMILY: 宋体">前面提到，所有的</span><span lang="EN-US" style="LETTER-SPACING: -0.1pt">.NET</span></span><span style="FONT-FAMILY: 宋体">类都派生于</span><span lang="EN-US" style="LETTER-SPACING: -0.1pt">System.Object</span><span style="FONT-FAMILY: 宋体">。在</span><span lang="EN-US">C#</span><span style="FONT-FAMILY: 宋体">中，如果在定义类时没有指定基类，编译器就会自动假定这个类派生于</span><span lang="EN-US">Object</span><span style="FONT-FAMILY: 宋体">。本章没有使用继承，所以前面介绍的每个类都派生于</span><span lang="EN-US" style="LETTER-SPACING: -0.1pt">System.Object(</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.1pt">如前所述，对于结构，这个派生是间接的：结构总是派生于</span><span lang="EN-US">System.ValueType</span><span style="FONT-FAMILY: 宋体">，</span><span lang="EN-US">System.ValueType</span><span style="FONT-FAMILY: 宋体">派生于</span><span lang="EN-US">System.Object<span style="LETTER-SPACING: -0.1pt">)</span></span><span style="FONT-FAMILY: 宋体">。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">其重要性在于，除了自己定义的方法和属性外，还可以访问为</span><span lang="EN-US">Object</span><span style="FONT-FAMILY: 宋体">定义的许多公共或受保护的成员方法。这些方法可以用于自己定义的所有其他类中。</span></p>
<h3 style="MARGIN: 8.15pt 0cm"><span lang="EN-US">3.4.1 System.Object</span><span style="FONT-FAMILY: 黑体">方法</span></h3>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在</span><span lang="EN-US" style="LETTER-SPACING: -0.1pt">Object</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.1pt">中定义的</span><span style="FONT-FAMILY: 宋体">方法如表</span><span lang="EN-US">3-2</span><span style="FONT-FAMILY: 宋体">所示。</span></p>
<p class="a5" style="MARGIN-TOP: 8.15pt"><span><span style="FONT-FAMILY: 黑体">表</span><span lang="EN-US"> 3-2</span></span></p>
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<p class="a2" style="LINE-HEIGHT: 15pt"><span style="FONT-FAMILY: 黑体">方</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'"> </span><span style="FONT-FAMILY: 黑体">法</span></p>
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<p class="a2" style="LINE-HEIGHT: 15pt"><span style="FONT-FAMILY: 黑体">访问修饰符</span></p>
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<p class="a2" style="LINE-HEIGHT: 15pt"><span style="FONT-FAMILY: 黑体">作</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'"> </span><span style="FONT-FAMILY: 黑体">用</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 15pt"><span lang="EN-US">string ToString()</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 15pt"><span lang="EN-US">public virtual</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 15pt"><span style="FONT-FAMILY: 宋体">返回对象的字符串表示</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 15pt"><span lang="EN-US">int GetHashTable()</span></p>
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