Remove item in array

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I have a list box which I have made an array from ...

public string[] getlistboxarray()
{
    string[] arr = new string[listBox2.Items.Count];
    for (int i = 0; i < listBox2.Items.Count; i++)
    {
        arr[i] = listBox2.Items[i].ToString();
    }
    return arr;
}

I have a start button, which when I click it removes the first item in the array. How would I do this?

What I have tried:

arr = arr.ToList().RemoveAt(0).ToArray();

Posted 24-Apr-18 9:45am

Member 13512434

Updated 24-Apr-18 10:07am

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Maciej Los 24-Apr-18 16:04pm

Why do you load items from listbox into array and them you want to remove first item?

Paulo Zemek 24-Apr-18 17:05pm

You can't really remove items from an array. What you can do is create another array with less items and copy only the items you care about.

Yet, as you used ToList().RemoveAt(0) in your try, why can't you simply have a list, instead of an array, so you can very easily add or remove items?

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Maciej Los · Answer 1 · 2018-04-24T10:07:00

Solution 1

Please, read my comment to the question first.

If you want to delete item from listbox, use: ListBox.ObjectCollection.RemoveAt Method (Int32) (System.Windows.Forms)[^]
If you want to remove item from array, use: Array.removeAt Function[^]

Posted 24-Apr-18 10:07am

Maciej Los

Wendelius · Answer 2 · 2018-04-24T10:08:00

Solution 2

If you want to manipulate just the array, one simple way is to copy the data in the into the array variable and then resize it.

For example

C#

Array.Copy(arr, 1, arr, 0, arr.Length - 1);
Array.Resize(ref arr, arr.Length - 1);

ADDED
-----
Or as Paolo Zemek suggested

string[] arr2 = new string[listBox2.Items.Count - 1];
Array.Copy(arr, 1, arr2, 0, arr.Length - 1);

Posted 24-Apr-18 10:08am

Wendelius

Updated 24-Apr-18 17:13pm

v4

Comments

Paulo Zemek 24-Apr-18 17:06pm

Actually the Resize method always creates a new array. So it would be better to simply create a new array with Length-1, and then copy directly to the new array.
Yet, using a List instead of an array is probably still the best option.

Wendelius 24-Apr-18 23:11pm

Good point, added copying to a new array.