Converting between Int32 and enum

Question

I have a custom type called ScaleGroup. I am trying to parse out the data (done) then convert it to ScaleGroup for comparison. ScaleGroup is an enum. I found this method online of conversion but it not working. How can I get the conversion?

Here is my type declaration

public ScaleGroup ScaleGroup { get; set; }

Here is where I need it to change from an Int32 to ScaleGroup

int num = Convert.ToInt32(ld.ScaleGroup);
int secondDigit = num % 10;
ld.ScaleGroup = (ScaleGroup)Convert.ChangeType(
       secondDigit, typeof(ScaleGroup));//problem spot

ScaleGroup declaration:

public enum ScaleGroup
{
    GROUP_1 = 1,
    GROUP_2 = 2,
    BOTH = 3
}

Rather than using Convert.ChangeType, why don't you just provide a constructor for ScaleGroup which takes an int parameter? — Jon Skeet
– Jon Skeet, Commented Jan 21, 2014 at 19:08
Well you're parsing, but then you've got an int, so anything after that point doesn't need to do any parsing... It's not clear what you mean by "in a reader" — Jon Skeet
– Jon Skeet, Commented Jan 21, 2014 at 19:11
Oh, you hadn't mentioned that it's an enum. Indeed, you claimed it's a class - but it's not. Just cast... — Jon Skeet
– Jon Skeet, Commented Jan 21, 2014 at 19:17

Jon Skeet · Accepted Answer · 2014-01-21 19:17:55Z

3

Now that we know that ScaleGroup isn't a class, but an enum, it's simple:

int num = (int) ld.ScaleGroup;
int secondDigit = num % 10;
ld.ScaleGroup = (ScaleGroup) secondDigit;

(It's not clear to me that that's actually what you want, given your enum declaration, but that will perform the relevant conversions...)

answered Jan 21, 2014 at 19:17

Jon Skeet

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2 Comments

Kpt.Khaos Over a year ago

That did it! My colleague made this enum in simple terms what is it for?

Jon Skeet Over a year ago

You should ask your colleague what it's for... I have no idea what you're doing.

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