Enum values in a list

Question

I've a enum class like,

public enum USERTYPE
{
   Permanant=1,
   Temporary=2,
}

in my business object I just declare this enum as

private List<USERTYPE> userType=new List<USERTYPE>;

and in the get/set method, I tried like

public List<USERTYPE> UserType
    {
        get 
        {
            return userType;
        }
        set
        { 
            userType= value; 
        }
    }

here it returns the no of rows as 0, how can I get all the values in the Enum here, can anyone help me here...

Are you filling that list before reading the number of rows ? — Alex
– Alex, Commented Jun 28, 2012 at 7:55
@Shanish take alook at here msdn.microsoft.com/en-us/library/system.enum.getvalues.aspx — Glory Raj
– Glory Raj, Commented Jun 28, 2012 at 7:55
Enum.GetValues(typeof(USERTYPE)).Cast<USERTYPE>().ToList(); this works actually, thanks everyone — shanish
– shanish, Commented Jun 28, 2012 at 7:59
@davenewza ya I want a list of USERTYPE, its working,thanks for ur support — shanish
– shanish, Commented Jun 28, 2012 at 7:59

Botz3000 · Accepted Answer · 2012-06-28 14:01:36Z

35

You can use this to get all individual enum values:

private List<USERTYPE> userTypes = Enum.GetValues(typeof(USERTYPE)).Cast<USERTYPE>().ToList();

If you do things like this more often, you could create a generic utility method for it:

public static T[] GetEnumValues<T>() where T : struct {
    if (!typeof(T).IsEnum) {
        throw new ArgumentException("GetValues<T> can only be called for types derived from System.Enum", "T");
    }
    return (T[])Enum.GetValues(typeof(T));
}

edited Jun 28, 2012 at 14:01

answered Jun 28, 2012 at 7:54

Botz3000

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2 Comments

Jeppe Stig Nielsen Over a year ago

Not very elegant since Enumerable.Cast enumerates your array, all members are boxed and then unboxed, and Enumerable.ToList enumerates and creates a new List<>. But I can understand why people use ugly solutions like this when the .NET Framework has not provided a generic version of Enum.GetValues.

apoteet Over a year ago

To anyone who couldn't find Cast() or ToList(), this requires you to include System.Linq

Jeppe Stig Nielsen · Accepted Answer · 2012-06-28 08:02:03Z

6

GetValues returns System.Array, but we know it's really a TEnum[] (that is a one-dimensional array indexed from zero) where TEnum is USERTYPE in your case. Therefore use:

var allUsertypeValues = (USERTYPE[])Enum.GetValues(typeof(USERTYPE));

answered Jun 28, 2012 at 8:02

Jeppe Stig Nielsen

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Comments

user333159 · Accepted Answer · 2012-06-28 12:54:42Z

4

UserTypeCan you please try with that,

 UserType = Enum.GetValues(typeof(USERTYPE)).OfType<USERTYPE>().ToList();

answered Jun 28, 2012 at 12:54

user333159

Comments

oleksii · Accepted Answer · 2012-06-28 08:00:48Z

2

If you want to get specific enum value from the list user.UserType then you first need to Add enum value to this list:

var user = new User();
//1 value - PERMANENT
user.UserType.Add(USERTYPE.Permanent);

But if you only need to get all the possible values from an arbitrary enum then you can try Enum.GetValues

//2 values - Permanant and Temporary
var enums = Enum.GetValues(typeof(USERTYPE));

answered Jun 28, 2012 at 8:00

oleksii

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Comments

Nikhil Agrawal · Accepted Answer · 2012-06-28 08:02:56Z

2

What you have is basically List of enum. Not individual items inside that enum.

To get list of enum values you can do

string[] str = Enum.GetNames(typeof(USERTYPE));

To use in get/set return string[] instead of List<>

public string[] UserType
{
    get 
    {
        return Enum.GetNames(typeof(USERTYPE));
    }
}

I think set will not work here because you cannot add values in enum at runtime.

edited Jun 28, 2012 at 8:02

answered Jun 28, 2012 at 7:51

Nikhil Agrawal

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2 Comments

shanish Over a year ago

how can I use this in Get/Set

shanish Over a year ago

thanks Nikhil and pratap, for ur support, actually Botz solution is working for me

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