Convert 2D string array into 2D int array (Multidimensional Arrays)

Question

I want to replace string[,] 2D array

public static readonly string[,] first =
{
    {"2", " ", " ", " ", "1"},
    {"2", " ", "4", "3", " "},
    {" ", "2", " ", "1", " "},
    {" ", "1", " ", "3", " "},
    {"1", " ", " ", " ", " "}
};

into int[,] array

int X=-1;
public static readonly int[,] second =  
{
    {2, X, X, X, 1},
    {2, X, 4, 3, X},
    {X, 2, X, 1, X},
    {X, 1, X, 3, X},
    {1, X, X, X, X}
};

Is it possible to convert a string[,] array to an int[,] array? If yes, how can I convert the string[,] into int[,]? Thank you.

I have tried to solve this with a loop, but I couldn't do it because the X should be the empty String "" — tamaramaria
– tamaramaria, Commented Nov 20, 2016 at 19:54
I don't understand what you're trying to do, then. If X isn't an int, then you can't put it in an int array. — user94559
– user94559, Commented Nov 20, 2016 at 20:03

Jim · Accepted Answer · 2016-11-20 20:38:58Z

1

Live example: Ideone

public static readonly string[,] first =
{
     {"2", " ", " ", " ", "1"},
     {"2", " ", "4", "3", " "},
     {" ", "2", " ", "1", " "},
     {" ", "1", " ", "3", " "},
     {"1", " ", " ", " ", " "}
};

Convert (note that when the string = " ", I'm putting a 0 instead):

int[,] second = new int[first.GetLength(0), first.GetLength(1)];

for (int j = 0; j < first.GetLength(0); j++)    
{
    for (int i = 0; i < first.GetLength(1); i++)
    {
        int number;
        bool ok = int.TryParse(first[j, i], out number);
        if (ok)
        {
            second[j, i] = number;
        }
        else
        {
            second[j, i] = 0;
        }
    }
}

edited Nov 20, 2016 at 20:38

answered Nov 20, 2016 at 20:09

Jim

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Comments

Peroxy · Accepted Answer · 2016-11-20 20:08:36Z

1

string[,] first =
{
    {"2", " ", " ", " ", "1"},
    {"2", " ", "4", "3", " "},
    {" ", "2", " ", "1", " "},
    {" ", "1", " ", "3", " "},
    {"1", " ", " ", " ", " "}
};


int[,] second = new int[first.GetLength(0), first.GetLength(1)];
int x = -1;
for (int i = 0; i < first.GetLength(0); i++)
{
    for (int j = 0; j < first.GetLength(1); j++)
    {
        second[i, j] = string.IsNullOrWhiteSpace(first[i, j]) ? x : Convert.ToInt32(first[i, j]);
    }
}

answered Nov 20, 2016 at 20:08

Peroxy

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Comments

andrasp · Accepted Answer · 2016-11-20 20:10:49Z

1

Assuming X = -1:

private static int[,] ConvertToIntArray(string[,] strArr)
{
    int rowCount = strArr.GetLength(dimension: 0);
    int colCount = strArr.GetLength(dimension: 1);

    int[,] result = new int[rowCount, colCount];
    for (int r = 0; r < rowCount; r++)
    {
        for (int c = 0; c < colCount; c++)
        {
            int value;
            result[r, c] = int.TryParse(strArr[r, c], out value) ? value : -1;
        }
    }
    return result;
}

answered Nov 20, 2016 at 20:10

andrasp

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Comments

Dennis Díaz · Accepted Answer · 2016-11-20 20:04:37Z

-1

Use the loop you are using and replace the empty strings by null values, and if you're going to use this array just check if the value is not null.

answered Nov 20, 2016 at 20:04

Dennis Díaz

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