Sort Items in a list box using an array?

Question

Ok, so i have to sort a listbox (randomListBox) using an array (defaultArray) for university, but the instructions and tutors aren't much help, so this is what i had using the instructions but it doesn't work.

    string[] defaultArray = new string[randomListBox.Items.Count];

    for (int i = 0; i < randomListBox.Items.Count; i++)
    {
        defaultArray[i] = randomListBox.Items[i].ToString();
    }

    Array.Sort(defaultArray);

    randomListBox.Items.Clear();

    for (int i = 0; i < randomListBox.Items.Count; i++)
    {
        randomListBox.Items.Add(defaultArray[i].ToString());
    }

the last line, and when it runs it doesnt put anything back into the listbox — CalumM, May 22 '14 at 03:41

score 2 · Accepted Answer · answered May 22 '14 at 03:42

2

Your second for loop never runs because you have deleted all the items in listbox therefore the items count is 0. Try:

for (int i = 0; i < defaultArray.Length; i++)
{
    randomListBox.Items.Add(defaultArray[i]);
}

answered May 22 '14 at 03:42

Selman Genç

100,147
13
119
184

score 0 · Answer 2 · answered May 22 '14 at 03:41

0

Think about the second occurrence of this line:

for (int i = 0; i < randomListBox.Items.Count; i++)

Are you sure that's what you meant?

What do you actually want to loop through?

(I'm not providing the answer directly as this is a homework question.)

answered May 22 '14 at 03:41

Igby Largeman

16,495
3
60
86

score 0 · Answer 3 · answered May 22 '14 at 03:46

0

In the last for loop, you are using randomListBox.Items.Count rather than defaultArray.Length.

for (int i = 0; i < defaultArray.Length; i++)
{
    randomListBox.Items.Add(defaultArray[i].ToString());
}

answered May 22 '14 at 03:46

Recourse

46
8

Sort Items in a list box using an array?

3 Answers3