how to get the last three elements from the string array in c#

Question

I have a string array in c#.Now as per my requirement i have to get the last ,second last and one element before second last elements in string but i am not getting how to get it. Here is my string array.With Last() i am able to get the last element but second last and before second last i am not getting to find out.

 string[] arrstr = str.Split(' ');

With .Last() i am able to get the last element but rest of the elements i am not able to get. Please help me..

@Xaruth: Ah, I see. Wasn't aware the minimum for close votes as that high, rather than in the lower hundreds. — O. R. Mapper, Aug 19 '14 at 12:54

thumbmunkeys · Accepted Answer · 2022-06-20T14:24:52.693

12

Use:

  string[] arrstr = str.Reverse().Take(3).Reverse().ToArray();

In more recent versions of c# you can now use:

  string[] arrstr = str.TakeLast(3).ToArray();

edited Jun 20 '22 at 14:24

answered Aug 19 '14 at 12:45

thumbmunkeys

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There is now a .TakeLast(3) method available in LINQ: https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.takelast?view=net-6.0 – Ovenkoek Jun 02 '22 at 08:37

Sajeetharan · Answer 2 · 2014-08-19T12:51:53.203

2

It actually gets the number of elements and skip the remaining element from the total count and take the specified amount you can replace the 3 with N and use as method

string[] res = arrstr.Skip(Math.Max(0, arrstr.Count() - 3)).Take(3).ToArray();

edited Aug 19 '14 at 12:51

answered Aug 19 '14 at 12:44

Sajeetharan

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A `.ToArray()` is missing there, right? Also, there should be some kind of an explanation. – O. R. Mapper Aug 19 '14 at 12:45
1

Take does not return `string[]` but `IEnumerable`... – digEmAll Aug 19 '14 at 12:45

score 2 · Answer 3 · answered Aug 19 '14 at 12:46

2

var threeLastElments = arrstr.Reverse().Take(3).Reverse().ToArray();

answered Aug 19 '14 at 12:46

IL_Agent

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what's the difference with thumbmunkeys's answer ? – Xaruth Aug 19 '14 at 12:48
where is the up-vote? OK so because this one is a few seconds later? – Bolu Aug 19 '14 at 12:55

score 1 · Answer 4 · answered Aug 19 '14 at 12:46

1

Get a substring:string arrstr = str.Substring(str.Length - 4, 3);

More on C# strings

answered Aug 19 '14 at 12:46

JKS

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score 0 · Answer 5 · answered Aug 19 '14 at 12:50

0

Why don't you calculate the length using obj.length; and then use arr[i] inside the loop and start the loop from last value.

answered Aug 19 '14 at 12:50

Smoking monkey

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`int len = arrstr.length; for(int i= len ; i>= len-2; i--) { int j = 0; String[] newArr = new String[3]; newArr[j] = arrstr[i]; j++; }` – Smoking monkey Aug 19 '14 at 12:59

score 0 · Answer 6 · answered Aug 19 '14 at 13:02

To offer another solution, one which will be much more performant than LINQ queries ...

 public static string[] getLast3(string[] src)
    {
        if (src.Length <= 3)
            return src;
        var res = new string[3];
        Array.Copy(src, src.Length - 3, res, 0, 3);
        return res;
    }

how to get the last three elements from the string array in c#

6 Answers6