向枚举类型变量添加多个值 [英] Adding multiple values to Enum Type variable

问题描述

http://msdn.microsoft.com/en-us/library/ cc138362.aspx

我将上面的链接代码显示给Enum Type添加值。
但它不工作在我的结束。
代码预期输出：
我正在获得实际的输出：

I refer a code from above link which is showing adding values to Enum Type. but its not working at my end. The code is expected output : I am getting actual output:

请参考代码：
**

//预期输出：会议日是星期二，星期四，星期五

Please refer code : **
// Expected Output: Meeting days are Tuesday, Thursday, Friday

//实际输出：会议日是星期五

//预期输出：会议日是星期四，星期五

// Expected Output: Meeting days are Thursday, Friday

// Actaul输出：会议日是星期一* *

     class Program
{
    enum Days2
    {
        None = 1,
        Sunday = 2,
        Monday = 3,
        Tuesday = 4,
        Wednesday = 5,
        Thursday = 6,
        Friday = 7,
        Saturday = 8
    }



    static void Main(string[] args)
    {
        Days2 meetingDays = Days2.Tuesday | Days2.Thursday;

        // Initialize with two flags using bitwise OR.
        meetingDays = Days2.Tuesday | Days2.Thursday;

        // Set an additional flag using bitwise OR.
        meetingDays = meetingDays | Days2.Friday;


        Console.WriteLine("Meeting days are {0}", meetingDays);
        // Expected Output: Meeting days are Tuesday, Thursday, Friday
        **// Actual Output: Meeting days are  Friday**

        // Remove a flag using bitwise XOR.
        meetingDays = meetingDays ^ Days2.Tuesday;
        Console.WriteLine("Meeting days are {0}", meetingDays);

        // Expected Output: Meeting days are Thursday, Friday
        **// Actaul Output: Meeting days are Monday**

        Console.ReadLine();

    }
}

推荐答案

为了能够使用按位操作来组合枚举值，它们需要具有对应于两个幂的值。

In order to be able to use bitwise operations to combine enum values, they need to have values that correspond to powers of two.

此外，您应该使用 Flags 属性标记枚举，并按惯例使用零作为no flags set 。示例：

Additionally, you should mark the enum with the Flags attribute, and by convention use zero as "no flags set". Example:

[Flags]
public enum Days2 
{
    None = 0,
    Sunday = 1
    Monday = 2,
    Tuesday = 4,
    Wednesday = 8,
    Thursday = 16,
    Friday = 32,
    Saturday = 64
}

请参阅编程指南。

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