http://nfex.ru/index.php?action=history&feed=atom&title=Csharp%2FCSharp_Tutorial%2FPreprocessing_Directives%2Fundef 2026-04-29T16:17:01Z История изменений этой страницы в вики MediaWiki 1.30.0 http://nfex.ru/index.php?title=Csharp/CSharp_Tutorial/Preprocessing_Directives/undef&diff=5818&oldid=prev 2010-05-26T15:31:53Z

<p></p> <table class="diff diff-contentalign-left" data-mw="interface"> <tr style="vertical-align: top;" lang="ru"> <td colspan="1" style="background-color: white; color:black; text-align: center;">← Предыдущая</td> <td colspan="1" style="background-color: white; color:black; text-align: center;">Версия 15:31, 26 мая 2010</td> </tr><tr><td colspan="2" style="text-align: center;" lang="ru"><div class="mw-diff-empty">(нет различий)</div> </td></tr></table>

http://nfex.ru/index.php?title=Csharp/CSharp_Tutorial/Preprocessing_Directives/undef&diff=5819&oldid=prev 2010-05-26T12:17:28Z

<p>1 версия</p> <p><b>Новая страница</b></p><div>==define OS constant for compilation==<br /> <br /> <br /> <br /> &lt;source lang=&quot;csharp&quot;&gt;#define win2000<br /> #define release<br /> #undef win98 <br /> using System;<br /> using System.Diagnostics;<br /> class MainClass<br /> {<br /> [Conditional(&quot;DEBUG&quot;)]<br /> public static void DumpState()<br /> {<br /> Console.WriteLine(&quot;Dump some state...&quot;);<br /> }<br /> public static void Main()<br /> {<br /> string platformName;<br /> #if winXP //Compiling for Windows XP<br /> platformName = &quot;Microsoft Windows XP&quot;;<br /> #elif win2000 // Compiling for Windows 2000<br /> platformName = &quot;Microsoft Windows 2000&quot;;<br /> #elif winNT // Compiling for Windows NT<br /> platformName = &quot;Microsoft Windows NT&quot;;<br /> #elif win98 // Compiling for Windows 98<br /> platformName = &quot;Microsoft Windows 98&quot;;<br /> #else // Unknown platform specified<br /> platformName = &quot;Unknown&quot;;<br /> #endif<br /> Console.WriteLine(platformName);<br /> // Call the conditional DumpState method<br /> DumpState();<br /> }<br /> }&lt;/source&gt;<br /> <br /> ==Use #define and #undef to control the program logic==<br /> <br /> &lt;OL&gt;&lt;LI&gt;The #undef directive removes a previously defined definition.&lt;/LI&gt;&lt;LI&gt;The #undef directive &quot;undefines&quot; a symbol.&lt;/LI&gt;&lt;/OL&gt;<br /> &lt;p&gt;The general form for #undef is&lt;/p&gt;<br /> <br /> <br /> &lt;source lang=&quot;csharp&quot;&gt;#undef symbol&lt;/source&gt;</div>

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