枚举是一组命名的整数常量，枚举类型是使用enum关键字声明的。
声明enum枚举变量
声明枚举的一般语法是-
enum <enum_name> { enumeration list };
enum_name - 定枚举类型名称。
enumeration list - 是逗号分隔的标识符列表。
枚举列表中的每个符号代表一个整数值，比前面的符号大一个，默认情况下，第一个枚举符号的值为0。如-
enum Days { Sun, Mon, tue, Wed, thu, Fri, Sat };
以下示例演示枚举变量的用法
using System;
namespace EnumApplication {
class EnumProgram {
enum Days { Sun, Mon, tue, Wed, thu, Fri, Sat };
</span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> </span><span class="typ">Main</span><span class="pun">(</span><span class="kwd">string</span><span class="pun">[]</span><span class="pln"> args</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
</span><span class="kwd">int</span><span class="pln"> </span><span class="typ">WeekdayStart</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="pun">(</span><span class="kwd">int</span><span class="pun">)</span><span class="typ">Days</span><span class="pun">.</span><span class="typ">Mon</span><span class="pun">;</span><span class="pln">
</span><span class="kwd">int</span><span class="pln"> </span><span class="typ">WeekdayEnd</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="pun">(</span><span class="kwd">int</span><span class="pun">)</span><span class="typ">Days</span><span class="pun">.</span><span class="typ">Fri</span><span class="pun">;</span><span class="pln">
</span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="str">"Monday: {0}"</span><span class="pun">,</span><span class="pln"> </span><span class="typ">WeekdayStart</span><span class="pun">);</span><span class="pln">
</span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="str">"Friday: {0}"</span><span class="pun">,</span><span class="pln"> </span><span class="typ">WeekdayEnd</span><span class="pun">);</span><span class="pln">
</span><span class="typ">Console</span><span class="pun">.</span><span class="typ">ReadKey</span><span class="pun">();</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
}
}
编译并执行上述代码时，将生成以下输出-
Monday: 1 Friday: 5
