标记枚举是为标记相互包含而使用的,每个成员被赋给一个唯一的按位值。
用按位或运算符(|)来组合按位标记。用按位和运算符(&)来确定一个标记的存在。
从组合状态中去掉一个元素用& (~)。
示例代码:
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace ConsoleApplication1
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{
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class Program
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{
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[Flags]
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public enum Contribution
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{
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Pension=0x01,
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ProfitSharing=0x02,
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CreditBureau=0x04,
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SavingsPlan=0x08,
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All = Pension | ProfitSharing | CreditBureau | SavingsPlan
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}
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public class Employee
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{
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private Contribution prop_contributions;
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public Contribution contributions
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{
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get { return prop_contributions; }
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set { prop_contributions = value; }
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}
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}
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public class Starter
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{
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public static void Main()
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{
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Employee bob = new Employee();
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bob.contributions = Contribution.ProfitSharing | Contribution.CreditBureau;
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if ((bob.contributions & Contribution.ProfitSharing) == Contribution.ProfitSharing)
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{
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Console.WriteLine("Bob enrolled in profit sharing");
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Console.WriteLine(bob.contributions);
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bob.contributions = bob.contributions & (~Contribution.ProfitSharing);
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Console.WriteLine(bob.contributions);
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}
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}
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}
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}
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}
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