Adding multiple values to Enum Type variable

Question

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

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:

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

// Actual Output: Meeting days are Friday

// Expected Output: Meeting days are Thursday, Friday

// Actaul Output: Meeting days are Monday**

     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();

    }
}

May be this example also? codeproject.com/Articles/386634/… — NoWar
– NoWar, Commented Jul 27, 2017 at 4:39

Anders Fjeldstad · Accepted Answer · 2011-05-02 14:46:12Z

13

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

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
}

See the C# Programming Guide for more info.

edited May 2, 2011 at 14:46

answered May 2, 2011 at 14:39

Anders Fjeldstad

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Comments

Anonymous · Accepted Answer · 2011-05-02 14:36:47Z

2

Add [Flags] attribute to your enum.

answered May 2, 2011 at 14:36

Anonymous

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Comments

Matías Fidemraizer · Accepted Answer · 2011-05-02 14:37:17Z

2

You forgot to use FlagsAttribute!

http://msdn.microsoft.com/es-es/library/system.flagsattribute(v=vs.80).aspx

answered May 2, 2011 at 14:37

Matías Fidemraizer

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Comments

MPelletier · Accepted Answer · 2011-05-02 14:44:35Z

2

Look at the value of Days2.Tuesday | Days2.Thursday; It should be 10. A bitwise AND is essentially an addition.

If you want several days, do them this way, binary style:

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

Or use the Flags attribute as others stated.

edited May 2, 2011 at 14:44

answered May 2, 2011 at 14:39

MPelletier

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1 Comment

MPelletier Over a year ago

Looking at the Flags attribute definition... It's definitely a clean solution

Marco · Accepted Answer · 2011-05-02 14:37:31Z

1

Mark the enum with [Flags] attribute.

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

answered May 2, 2011 at 14:37

Marco

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