Adding string list item to int array

Question

Hello I need to take string item from string list and a add it to the int array i trying like this but its writing me error Cannot implicity convert type int to int[] but in for sequence i adding only one int to one item in array so what is wrong please

private void buttonGenerateO_Click(object sender, EventArgs e)
            {
            List<string> AgentNumbers = new List<string>();
            List<string> AgentRide = new List<string>();
            int pocet = AgentNumbers.Count;
            int[][] dvouRozmernePole = new int[2][];
            dvouRozmernePole[0] = new int[pocet];
            dvouRozmernePole[1] = new int[pocet];

        foreach (string AgeNumb in AgentNumbers)
        {
            for (int i = 0; i < dvouRozmernePole[0].Length; i++)
                dvouRozmernePole[i] = Convert.ToInt32(AgeNumb);

        }

        foreach (string AgeRide in AgentRide)
        {
            for (int i = 0; i < dvouRozmernePole[1].Length; i++)
                dvouRozmernePole[i] = Convert.ToInt32(AgeRide);

        }

Jon Skeet · Accepted Answer · 2012-12-30 21:44:07Z

Look at this declaration:

int[][] dvouRozmernePole = new int[2][];

So dvouRozmernePole is an array of arrays. Now look here:

dvouRozmernePole[i] = Convert.ToInt32(AgeNumb);

You're trying to assign an int value to dvouRozmernePole[i], which you can't do because it should be an int[].

I suspect you want:

dvouRozmernePole[0][i] = Convert.ToInt32(AgeNumb);

Having said that, given these lines:

List<string> AgentNumbers = new List<string>();
List<string> AgentRide = new List<string>();
int pocet = AgentNumbers.Count;
int[][] dvouRozmernePole = new int[2][];
dvouRozmernePole[0] = new int[pocet];
dvouRozmernePole[1] = new int[pocet];

... you'll always have empty lists anyway, so there are no values to convert.

Do you really need to use arrays at all? Using List<T> everywhere would almost certainly be simpler.

LINQ can also make this simpler. For example:

int[] numbers = AgentNumbers.Select(x => int.Parse(x)).ToArray();
int[] rides = AgentRide.Select(x => int.Parse(x)).ToArray();
int[][] dvouRozmernePole = { numbers, rides };

Lee · Accepted Answer · 2012-12-30 21:49:43Z

0

dvouRozmernePole is an array of int[], while Convert.ToInt32 returns an int. Therefore in:

dvouRozmernePole[i] = Convert.ToInt32(AgeNumb);

dvouRozmernePole[i] is an int[], and you are trying to assign an int.

It looks like you want:

dvouRozmernePole[0][i] = Convert.ToInt32(AgeNumb);

and later

dvouRozmernePole[1][i] = Convert.ToInt32(AgeRide);

You could instead do:

int[][] dvouRozmernePole = new int[2][]
{
    AgentNumbers.Select(num => Convert.ToInt32(num)).ToArray(),
    AgentRide.Select(ride => Convert.ToInt32(ride)).ToArray()
};

to initialise the array.

edited Dec 30, 2012 at 21:49

answered Dec 30, 2012 at 21:43

Lee

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2 Comments

Miko Over a year ago

Ok im quite a noob so how can i add items from list to array ? Im googling for 3 hours and this is a result but now im stacked... how can i fill the array ?

Lee Over a year ago

@user1936559 - There are a few ways, one is a loop similar to what you have, another is to use LINQ. I've added a LINQ example.

Some programmer dude · Accepted Answer · 2012-12-30 21:43:36Z

0

The error is quite clear. In the statement

dvouRozmernePole[i] = Convert.ToInt32(AgeNumb);

you assign an integer to an array.

answered Dec 30, 2012 at 21:43

Some programmer dude

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Comments

Bob Vale · Accepted Answer · 2012-12-30 21:44:30Z

0

dvouRozmernePole is an array of array of ints

so dvouRozmernePole[i] expects and int[] rather than the int value

try

did you mean

    for (int i = 0; i < dvouRozmernePole[0].Length; i++)
           dvouRozmernePole[0][i] = Convert.ToInt32(AgeNumb);
    }

    foreach (string AgeRide in AgentRide)
    {
        for (int i = 0; i < dvouRozmernePole[1].Length; i++)
            dvouRozmernePole[1][i] = Convert.ToInt32(AgeRide);

    }

answered Dec 30, 2012 at 21:44

Bob Vale

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