100162742.htm

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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        2.5  流控制
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                        C#高级编程（第3版）【全文连载】
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                        2.5  流控制
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                    <a class="url" href="../../default.htm">http://book.csdn.net/</a>
                    2006-8-17 16:57:00
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                        图书导读
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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='100162742.htm'><font color='red'>2.5  流控制</font></a></h1>
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                        <div style='float:left;width:49%'>·<a href='100162739.htm'>2.2  第一个C#程序</a></div><div style='float:right;width:49%'>·<a href='100162740.htm'>2.3  变量</a></div><div style='float:left;width:49%'>·<a href='100162741.htm'>2.4  预定义数据类型</a></div><div style='float:right;width:49%'>·<a href='100162743.htm'>2.6  枚举</a></div><div style='float:left;width:49%'>·<a href='100162744.htm'>2.7  数组</a></div><div style='float:right;width:49%'>·<a href='100162745.htm'>2.8  命名空间</a></div></div>
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                <div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h2 style="MARGIN: 11.4pt 0cm"><span></span><span><span lang="EN-US">2.5&nbsp; </span></span><span style="FONT-FAMILY: 楷体_GB2312">流控制</span></h2>
<p class="MsoBodyTextIndent"><span style="FONT-FAMILY: 宋体">本节将介绍</span><span lang="EN-US">C#</span><span style="FONT-FAMILY: 宋体">语言的重要语句：控制程序流的语句，它们不是按代码在程序中的排列位置顺序执行的。</span></p>
<h3 style="MARGIN: 8.15pt 0cm"><span><span lang="EN-US">2.5.1 &nbsp;</span></span><span style="FONT-FAMILY: 黑体">条件语句</span></h3>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">条件语句可以根据条件是否满足或根据表达式的值控制代码的执行分支。</span><span lang="EN-US">C#</span><span style="FONT-FAMILY: 宋体">有两个分支代码的结构：</span><span lang="EN-US">if</span><span style="FONT-FAMILY: 宋体">语句，测试特定条件是否满足；</span><span lang="EN-US">switch</span><span style="FONT-FAMILY: 宋体">语句，它比较表达式和许多不同的值。</span></p>
<h4 style="TEXT-INDENT: 21.45pt"><span lang="EN-US">1. if</span><span style="FONT-FAMILY: 黑体">语句</span></h4>
<p class="MsoNormal"><span><span style="FONT-FAMILY: 宋体">对于条件分支，</span><span lang="EN-US">C#</span></span><span style="FONT-FAMILY: 宋体">继承了</span><span lang="EN-US">C</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">C++</span><span style="FONT-FAMILY: 宋体">的</span><span lang="EN-US">if<sup>...</sup>else</span><span style="FONT-FAMILY: 宋体">结构。对于用过程语言编程的任何人来说，其语法都是非常直观的：</span></p>
<p class="a6" style="MARGIN: 8.15pt 0cm 0pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">if (condition)</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; statement(s)</span></p>
<p class="a6" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">else</span></p>
<p class="a6" style="MARGIN: 0cm 0cm 8.15pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; statement(s)</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">如果在条件中要执行多个语句，就需要用花括号</span><span lang="EN-US">({ <sup>...</sup> })</span><span style="FONT-FAMILY: 宋体">把这些语句组合为一个块。</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">这也适用于其他可以把语句组合为一个块的</span><span lang="EN-US">C#</span><span style="FONT-FAMILY: 宋体">结构，例如</span><span lang="EN-US">for</span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US">while</span><span style="FONT-FAMILY: 宋体">循环</span><span lang="EN-US">)</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">bool isZero;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">if (i == 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">&nbsp;&nbsp; isZero = true;</span></p>
<p class="2" style="MARGIN-LEFT: 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-US">&nbsp;&nbsp; Console.WriteLine(&quot;i is Zero&quot;);</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">else</span></p>
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