C# numeric enum value as string

Question

I have the following enum:

public enum Urgency {
    VeryHigh = 1,
    High     = 2,
    Routine  = 4
}

I can fetch an enum \"value

Answer 1

You can write an extension method for your specific type:

public static class UrgencyExtension
{
    public static string ToIntegerString(this Urgency u)
    {
        return ((int)u).ToString();
    }
}

Use as follows:

Urgency u = Urgency.Routine;
string s = u.ToIntegerString();

Answer 2

You should just be able to use the overloads of Enums ToString method to give it a format string, this will print out the value of the enum as a string.

public static class Program
{
    static void Main(string[] args)
    {
        var val = Urgency.High;
        Console.WriteLine(val.ToString("D")); 
    }
}

public enum Urgency 
{ 
    VeryHigh = 1,
    High = 2,
    Low = 4
}

Answer 3

How about a little reflection? Should work with all underlying types.

public static class EnumTools
{
    public static string ToRawValueString(this Enum e)
    {
        return e
            .GetType()
            .GetFields(BindingFlags.Public | BindingFlags.Static)
            .First(f => f.Name==e.ToString())
            .GetRawConstantValue()
            .ToString();
    }
}

Then:

Console.WriteLine(Urgency.High.ToRawValueString()); //Writes "2"

Answer 4

In order to achieve more "human readable" descriptions for enums (e.g. "Very High" rather than "VeryHigh" in your example) I have decorated enum values with attribute as follows:

public enum MeasurementType
{
    Each,

    [DisplayText("Lineal Metres")]
    LinealMetre,

    [DisplayText("Square Metres")]
    SquareMetre,

    [DisplayText("Cubic Metres")]
    CubicMetre,

    [DisplayText("Per 1000")]
    Per1000,

    Other
}


public class DisplayText : Attribute
{

    public DisplayText(string Text)
    {
        this.text = Text;
    }


    private string text;


    public string Text
    {
        get { return text; }
        set { text = value; }
    }
}

Then, used an extension method like this:

    public static string ToDescription(this Enum en)
    {

        Type type = en.GetType();

        MemberInfo[] memInfo = type.GetMember(en.ToString());

        if (memInfo != null && memInfo.Length > 0)
        {

            object[] attrs = memInfo[0].GetCustomAttributes(
                                          typeof(DisplayText),

                                          false);

            if (attrs != null && attrs.Length > 0)

                return ((DisplayText)attrs[0]).Text;

        }

        return en.ToString();

    }

You can then just call

myEnum.ToDescription()

in order to display your enum as more readable text.

Answer 5

a simple approach

((Urgency)4).ToString() // returns "Routine"

Answer 6

If you want to just deal with this enum, use Mark Byer's solution.

For a more general solution:

public static string NumberString(this Enum enVal) 
{
    return Convert.ToDecimal(enVal).ToString("0");
}

Converting to decimal means you don't need to deal with the 8 different allowed underlying integral types explicitly, as all of them convert losslessly to decimal but not to each other (ulong and long don't convert losslessly between each other but both can handle all the rest). Doing that would probably be faster (esp. if you pick well in your order of comparison), but a lot more verbose for relatively little gain.

Edit:

The above isn't as good as Frankentosh's though, Frankentosh saw through the question to the real problem and solves it very eloquently.