c# "For" keep getting 'Index was outside the bounds of the array.'

Question

got datagridview with 3 data, I want to get the first cells data on each rows, when I use this kind of code

string[] DataGridViewArray = { };
            for (int i = 0; i < DataGridView1.Rows.Count; i++)
            {
                DataGridViewArray[i] = DataGridView1.Rows[i].Cells[0].Value.ToString().Trim();
            }
            textBox1.Text = DataGridViewArray.ToString();

why it keep said 'Index was outside the bounds of the array.'

Because literally any value of `i` is outside the bounds of the array. The error is correct, as expected. — Blindy, Jun 12 '22 at 00:11
Before you switch to a `List`, without looping the Rows, check what `DataGridViewArray.ToString()` is going to return (try out, e.g., `string.Join()` after). — Jimi, Jun 12 '22 at 00:26

Koref Koref · Accepted Answer · 2022-06-12T01:36:41.787

Array is fixed size and its size is determined when declaring it (eg. in your first line of code) .

However, you gave it no single element nor set its size with expected number of items its going to hold - which in your case should be DataGridView1.Rows.Count.

       string[] DataGridViewArray = { };

Instead, if you replace that (line #1 code) as follows, it should work:

        string[] DataGridViewArray = new string[DataGridView1.Rows.Count];

        for (int i = 0; i < DataGridView1.Rows.Count; i++)
        {
             DataGridViewArray[i] = 
             DataGridView1.Rows[i].Cells[0].Value.ToString().Trim();
        }

        textBox1.Text = DataGridViewArray.ToString();

I don't have DataGridView1 but I did something similar just to show you the reason why you are getting out of index error and how to fix it.

Clostly look at the length of the array in a way you defined it vs when array length is provided when declaring it.

score 0 · Answer 2 · edited Jun 12 '22 at 01:36

0

It's because you didn't properly instantiate your array so any iteration will be out of bounds.

edited Jun 12 '22 at 01:36

Enigmativity

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answered Jun 12 '22 at 01:34

HomerSimpsons

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c# "For" keep getting 'Index was outside the bounds of the array.'

2 Answers2