Get Specific number from List

Question

I have this list List<string> Url = new List<string>(); with more element >10 and i need to get only 5 element.

I tried in this mode i get all element:

foreach (string key3 in Url)
            {
                listBox3.Items.Add(key3);
            }

Look at this answer on stackoverflow for first N elements in list: http://stackoverflow.com/questions/319973/how-to-get-first-n-elements-of-a-list-in-c — Bronek, Aug 14 '13 at 09:32

Jamiec · Answer 1 · 2013-08-14T09:26:58.077

6

IEnumerable<string> firstFiveUrls = Url.Take(5);

So you could do:

// ObjectCollection.AddRange expects an array 
listBox3.Items.AddRange(Url.Take(5).ToArray());

edited Aug 14 '13 at 09:26

answered Aug 14 '13 at 09:21

Jamiec

another list?? nah thanks =( – Federal09 Aug 14 '13 at 09:23
@Federal09 - See update, you're adding to a listbox's items which expects an array – Jamiec Aug 14 '13 at 09:24

score 3 · Answer 2 · answered Aug 14 '13 at 09:22

3

for (int i = 0; i < 5; i++)
{
    listBox3.Items.Add(Url[i]);
}

If you can ensure that there are always > 5 elements, this should be ok.

answered Aug 14 '13 at 09:22

MS_SP

It is worth noting that with this approach you should validate the input to ensure it has at least 5 elements before looping – musefan Aug 14 '13 at 09:26

score 1 · Accepted Answer · answered Aug 14 '13 at 09:21

1

try this:

for(int i=0; i<5; ++i)
{
  listBox3.Items.Add(Url[i]);
}

answered Aug 14 '13 at 09:21

Davide Piras

score 1 · Answer 4 · answered Aug 14 '13 at 09:24

1

You can use GetRange

Url.GetRange(0,5);

listBox3.Items.AddRange(Url.GetRange(0,5));

answered Aug 14 '13 at 09:24

Sayse

score 0 · Answer 5 · answered Aug 14 '13 at 09:27

0

With Start index and count..

List<string> fiveURLs = URL.GetRange(0, 5);

answered Aug 14 '13 at 09:27

Naren

score 0 · Answer 6 · answered Aug 14 '13 at 09:29

0

first five elements

for (int i = 0; i < Url.Count && i < 5; i++)
    {
         listBox3.Items.Add(Url[i]);
    }

fifth element

listBox3.Items.Add(Url[4]);

answered Aug 14 '13 at 09:29

Bronek

6 Answers6