Enum

[shapper]

Hello,

I have the following Enum

Public Enum Mode
Required
Validate
End Enum

How can I make a variable of type Mode to hold both Required and
Validate values without needing to add an option to my enum named
RequiredValidate?

And how can I check if that variable contains Required, Validate or
Required and Validate?

Is this possible?

Thanks,

Miguel

 

[Dave Bush]

You can't.

An enum is logically the same as an Integer. So trying to store both
Required and Validate in a variable declared as Mode is like trying to
store a zero and a one in an Integer that will only hold a zero or a
one. (or a one and a two)

You are going to need a third item in the Enum.

-----Original Message-----
From: shapper [mailto:[email protected]]
Posted At: Wednesday, October 31, 2007 7:42 AM
Posted To: microsoft.public.dotnet.framework.aspnet
Conversation: Enum
Subject: Enum

Hello,

I have the following Enum

Public Enum Mode
Required
Validate
End Enum

How can I make a variable of type Mode to hold both Required and
Validate values without needing to add an option to my enum named
RequiredValidate?

And how can I check if that variable contains Required, Validate or
Required and Validate?

Is this possible?

Thanks,

Miguel

 

[Patrice]

MyMode=Mode.Required Or Mode.Validate is perfectly valid

If you want to create a value that combine both you'll have to add this
value to your enum as RequiredValidate=Required Or Validate

Each value is a power of two so that you can combine values into a single
value (using or) or test them (using and).

See
http://msdn2.microsoft.com/en-us/library/system.flagsattribute(VS.80).aspx
for details...

 

[Kelly Herald]

You need to add the Flags attribute to the enum. You should set each value
specifically to be the value of a single bit (i.e. 1, 2, 4, 8, 16, etc...).
This way you can tell which enum flag is in a value. If you have the value
of 5 that means you have the enum values of 1 and 4.

Your example is below:

<Flags> _
Public Enum Mode
Required = 1
Validate = 2
End Enum

 

[Rad [Visual C# MVP]]

MyMode=Mode.Required Or Mode.Validate is perfectly valid

If you want to create a value that combine both you'll have to add this
value to your enum as RequiredValidate=Required Or Validate

Each value is a power of two so that you can combine values into a single
value (using or) or test them (using and).

See
http://msdn2.microsoft.com/en-us/library/system.flagsattribute(VS.80).aspx
for details...

To do this, add a <Flags()> attribute before the enum