Concat arrays at a certain index with LINQ?

Question

I want to do this in LINQ:

public static void ConcatAt(this string[] items, string[] others, int at)
{
    for (int i = 0; i < others.Length && at < items.Length; i++, at++) {
        items[at] = others[i];
    }
}

Usage:

string[] groups = { "G1", "G2", "G3" };
string[] names = new string[groups.Length + 1];
names[0] = "Choose";
names.ConcatAt(groups, 1);

foreach (var n in names)
    Console.WriteLine(n);

/*
Choose
G1
G2
G3
*/

String was just an example, could be anything though.

So is there a LINQ method that does this?

Doing a names = names.Concat(groups).ToArray(); will include the empty strings that's in names so if I print names I'd get:

/*
Choose



G1
G2
G3
*/

Thanks.

Not sure I understand why, in your specific example, you can't use names = names.Concat(groups).ToArray();? Is the index a requirement .. ? — Simon Whitehead
– Simon Whitehead, Commented Jan 4, 2014 at 3:38
No because that would include the empty strings as well that's in names. So If I print names, I would get "Choose", "", "", "", G1", etc. — vexe
– vexe, Commented Jan 4, 2014 at 3:40
@vexe I don't know, it seems like a viable question to me. +1 — cost
– cost, Commented Jan 4, 2014 at 3:45

Victor Mukherjee · Accepted Answer · 2014-01-04 04:02:21Z

5

Why are you not using Array.Copy?

Array.Copy(groups, 0, names, at,groups.Length);

answered Jan 4, 2014 at 4:02

Victor Mukherjee

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1 Comment

vexe Over a year ago

Thanks that works. I never used that. I thought there'd be some LINQ method.

Binson Eldhose · Accepted Answer · 2014-01-04 04:11:12Z

1

I think it will work for you

         string[] groups = { "G1", "G2", "G3" };

        var myNewItems = groups.ToList();

        int pos = 1;
        string value = "Choose";
        myNewItems.Insert(pos,value);



        foreach (var v in myNewItems)
        {
            Console.WriteLine(v);
        }
        Console.ReadLine();

answered Jan 4, 2014 at 4:11

Binson Eldhose

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2 Comments

Binson Eldhose Over a year ago

specific means? do you want to combine array in diffrent datata types?

vexe Over a year ago

I mean, I was looking for a more general solution that concatenates arrays from a certain index within a certain length but you provided a work-around that works specifically for my case where I just have to insert "Choose" before the "G"s. Thanks for the help.

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