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2.9 Main()方法
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2.9 Main()方法
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2006-8-17 16:57:00
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<div style='float:left;width:49%'>·<a href='100162743.htm'>2.6 枚举</a></div><div style='float:right;width:49%'>·<a href='100162744.htm'>2.7 数组</a></div><div style='float:left;width:49%'>·<a href='100162745.htm'>2.8 命名空间</a></div><div style='float:right;width:49%'>·<a href='100162747.htm'>2.10 有关编译C#文件的更多内容</a></div><div style='float:left;width:49%'>·<a href='100162748.htm'>2.11 控制台I/O</a></div><div style='float:right;width:49%'>·<a href='100162749.htm'>2.12 使用注释</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">本章的开头提到过，</span><span lang="EN-US">C#</span></span><span style="FONT-FAMILY: 宋体">程序是从方法</span><span lang="EN-US">Main()</span><span style="FONT-FAMILY: 宋体">开始执行的。这个方法必须是类或结构的静态方法，并且其返回类型必须是</span><span lang="EN-US">int</span><span style="FONT-FAMILY: 宋体">或</span><span lang="EN-US">void</span><span style="FONT-FAMILY: 宋体">。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">虽然显式指定</span><span lang="EN-US">public</span><span style="FONT-FAMILY: 宋体">修饰符是很常见的，因为按照定义，必须在程序外部调用该方法，但我们给该方法指定什么访问级别并不重要，即使把该方法标记为</span><span lang="EN-US">private</span><span style="FONT-FAMILY: 宋体">，它也可以运行。</span></p>
<h3 style="MARGIN: 8.15pt 0cm"><span><span lang="EN-US">2.9.1 </span></span><span style="FONT-FAMILY: 黑体">多个</span><span lang="EN-US">Main()</span><span style="FONT-FAMILY: 黑体">方法</span></h3>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">在编<span style="LETTER-SPACING: -1pt">译</span></span><span lang="EN-US" style="LETTER-SPACING: -1pt">C</span><span lang="EN-US">#</span><span style="FONT-FAMILY: 宋体">控制台或</span><span lang="EN-US">Windows</span><span style="FONT-FAMILY: 宋体">应用程序时，默认情况下，编译器会在与上述名称列表相匹配的任何类中查找</span><span lang="EN-US">Main</span><span style="FONT-FAMILY: 宋体">方法，并使这个类方法成为程序的入口。如果有多个</span><span lang="EN-US">Main</span><span style="FONT-FAMILY: 宋体">方法，编译器就会返回一个错误，例如，考虑下面的代码</span><span lang="EN-US">MainExample.cs</span><span style="FONT-FAMILY: 宋体">：</span></p>
<p class="2" style="MARGIN: 8.15pt 0cm 0pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">using System;</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">namespace Wrox.ProCSharp.Basics</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"> class Client</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"> public static int Main()</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"> MathExample.Main();</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US"> return 0;</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"> }</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"> class MathExample</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"> static int Add(int x, int y)</span></p>
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