Inserting/adding from one arraylist into two arraylist

Question

I'm looking a way to insert arraylist in two different arraylist with same number of items. for an example:

I have ArrayList something like this

ArrayList mainArrayList = new ArrayList {1, 2, 3,4,5,6};

So what I want from mainArrayList to insert into two arraylist (arraylist1 and arraylist 2)

this is what i am looking to have in two arraylist:

ArrayList arrayList1 = new ArrayList {1, 2, 3};
ArrayList arrayList2 = new ArrayList {4, 5, 6};

I can do through for loop but i am sure there is better of doing this.

 for (int i = 0; i < mainArrayList.Count; i++)
 {
    if(arraylist1.Count <3) {
       arrayList1.Add(mainArrayList[i]);
    }
    if(arrayList1.Count >3)
    {
       arrayList2.Add(mainArrayList[i]);
    }
}

First, don't use ArrayList, use List<T>, where T is the type to store (in this case int.) Once you do that, you can use the LINQ Concat() method to get what you want: mainList = firstList.Concat(secondList).ToList(); — dlev
– dlev, Commented May 4, 2013 at 0:11
i updated my question... i think you got confused with my question. so what i am looking is from mainlist data i want two arraylist or list with equal data on in it in my case firstlist 1,2,3 and in secondlist 4,5,6 - hope i make sense. — Nick Kahn
– Nick Kahn, Commented May 4, 2013 at 0:19

Philip · Accepted Answer · 2013-05-04 00:31:01Z

2

Use List<T> instead of ArrayList which is an old non-generic container. Then you can use GetRange():

List<int> mainList = new List<int> {1, 2, 3, 4, 5, 6};

List<int> list1 = mainList.GetRange(0, 3);
List<int> list2 = mainList.GetRange(3, 3);

edited May 4, 2013 at 0:31

answered May 4, 2013 at 0:25

Philip

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Comments

Julián Urbano · Accepted Answer · 2013-05-04 00:39:28Z

1

Use GetRange(from, length)

ArrayList mainArrayList = new ArrayList { 1, 2, 3, 4, 5, 6 };

ArrayList arrayList1 = mainArrayList.GetRange(0, 3);
ArrayList arrayList2 = mainArrayList.GetRange(3, 3);

edited May 4, 2013 at 0:39

Julián Urbano

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answered May 4, 2013 at 0:25

Akram Berkawy

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