convert char array to enum array?

Question

Our app uses a string to house character-values used to indicate enum values. for ex, the enum for aligning cells in a table:

enum CellAlignment
{
    Left = 1,
    Center = 2,
    Right = 3
}

and the string used to represent alignments for a table of 5 columns: "12312". Is there a snappy way to use LINQ to convert this string into CellAlignment[] cellAlignments?

here's what I've resorted to:

//convert string into character array
char[] cCellAligns = "12312".ToCharArray();

int itemCount = cCellAligns.Count();

int[] iCellAlignments = new int[itemCount];

//loop thru char array to populate corresponding int array
int i;
for (i = 0; i <= itemCount - 1; i++)
    iCellAlignments[i] = Int32.Parse(cCellAligns[i].ToString());

//convert int array to enum array
CellAlignment[] cellAlignments = iCellAlignments.Cast<CellAlignment>().Select(foo => foo).ToArray();

...ive tried this but it said specified cast not valid:

CellAlignment[] cellAlignmentsX = cCellAligns.Cast<CellAlignment>().Select(foo => foo).ToArray();

thank you!

Jon Skeet · Accepted Answer · 2012-03-21 17:59:39Z

5

Sure:

var enumValues = text.Select(c => (CellAlignment)(c - '0'))
                     .ToArray();

That assumes all the values are valid, of course... it uses the fact that you can subtract '0' from any digit character to get the value of that digit, and that you can explicitly convert from int to CellAlignment.

answered Mar 21, 2012 at 17:59

Jon Skeet

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1 Comment

mdelvecchio Over a year ago

thanks, this is super short. since the enum is based on ints, i believe converting explicitly is better than parsing.

BrokenGlass · Accepted Answer · 2012-03-21 17:59:26Z

4

Using a Linq projection and Enum.Parse:

string input = "12312";
CellAlignment[] cellAlignments = input.Select(c => (CellAlignment)Enum.Parse(typeof(CellAlignment), c.ToString()))
                                      .ToArray();

answered Mar 21, 2012 at 17:59

BrokenGlass

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Comments

Dmitry Reznik · Accepted Answer · 2012-03-21 18:00:42Z

1

You could use Array.ConvertAll function something like this:

CellAlignment[] alignments = Array.ConvertAll("12312", x => (CellAlignment)Int32.Parse(x));

answered Mar 21, 2012 at 18:00

Dmitry Reznik

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Comments

Daniel Hilgarth · Accepted Answer · 2012-03-21 18:00:28Z

0

You can use this:

var s = "12312";
s.Select(x => (CellAlignment)int.Parse(x.ToString()));

answered Mar 21, 2012 at 18:00

Daniel Hilgarth

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Matthew · Accepted Answer · 2012-03-21 18:00:33Z

0

You can write a loop

List<CellAlignment> cellAlignments = new List<CellAlignment>();

foreach( int i in iCellAlignments)
{
    cellAlignments.Add((CellAlignment)Enum.Parse(typeof(CellAlignment), i.ToString());
}

answered Mar 21, 2012 at 18:00

Matthew

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1 Comment

mdelvecchio Over a year ago

trying to do w/ LINQ and not iterating loops.

daryal · Accepted Answer · 2012-03-21 18:06:24Z

0

Try something similar to the following;

int[] iCellAlignments = new int[5] { 1, 2, 3, 1, 2 };
        CellAlignment[] temp = new CellAlignment[5];


        for (int i = 0; i < iCellAlignments.Length; i++)
        {
            temp[i] =(CellAlignment)iCellAlignments[i];
        }

answered Mar 21, 2012 at 18:06

daryal

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1 Comment

mdelvecchio Over a year ago

trying to do w/ LINQ and not iterating loops.

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