C# Jagged Array check if value exists/true

Question

This is my code , i am using 2 dimension array .

top = 0;
if(rowcol[i-1][j]){ top = rowcol[i-1][j] }

But it shows this error :

Cannot implicitly convert type 'string' to 'bool'

Full code :

 string[] fileData = File.ReadAllLines(@"C:\Users\apr13mpsip\Desktop\OneOrganizer\OneOrganizer\WordPuzzle\testing.txt");

        string[] lineValues;

        int row = 0;
        int col;

        string[][] rowcol = new string[fileData.Length][];

        foreach (string line in fileData)
        {
            lineValues = line.Split(new string[] { "," }, StringSplitOptions.None);


            rowcol[row] = new string[lineValues.Length];

            col = 0;

            foreach (string value in lineValues)
            {
                rowcol[row][col] = value;
                col++;
            }
            row++;

        }


        for (int i = 0; i < rowcol.GetLength(0) ; i++)
        {
            for (int j = 0; j < rowcol[i].GetLength(0) ; j++)
            {


                int iadd =  i+1 <rowcol.GetLength(0) ? i + 1: 0;
                int iminus =   i-1> 0  ? i - 1 : 0;
                int jadd =  j+1 <rowcol.GetLength(0) ? j + 1 : 0;
                int jminus = j-1 > 0 ? j - 1 : 0;
                var self = rowcol[i][j]; // current value

                top = 0;
if(rowcol[iminus][j]){ top = rowcol[iminus][j] } // ERROR HERE
}
}

i am actually reading from a textfile and creating something out of it by creating rows and cols 10x10 in a jagged array. so i could find their value by rowcol[][] .

Ehsan · Accepted Answer · 2013-08-13 09:21:17Z

3

because

if(rowcol[i-1][j])

will return string as per your definition

string[][] rowcol

and if statement needs bool. you need to check it against something like

if(rowcol[i-1][j] == "stringtotest")

answered Aug 13, 2013 at 9:21

Ehsan

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Comments

Andrei · Accepted Answer · 2013-08-13 09:22:03Z

2

Only boolean expression can be used as if condition, for example:

if (!string.IsNullOrEmpty(rowcol[i-1][j]))

answered Aug 13, 2013 at 9:22

Andrei

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2 Comments

user2376998 Over a year ago

how do i return a null if it is empty

Andrei Over a year ago

@user2376998, not sure if I understood you question correctly. string.IsNullOrEmpty returns true if string in test is either null or empty, and false otherwise. So if you use the condition above as is, top will be assigned only when rowcol[i-1][j] is neither null nor empty. Is this what you are looking for?

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