How remove array of arraylist using c#?

Question

How to remove the array from arraylist

class Program
{
    static void Main(string[] args)
    {
        ArrayList[] arr = new ArrayList[3000];
        int capacityForList = 2;

        int i = 0;
        int j;
        int k;

        arr[i] = new ArrayList();
        arr[i].Add("A");
        i++;
        arr[i] = new ArrayList();
        arr[i].Add("B");
        i++;
        arr[i] = new ArrayList();
        arr[i].Add("C");
        i++;
        arr[i] = new ArrayList();
        arr[i].Add("D");
        i++;
        arr[i] = new ArrayList();
        arr[i].Add("E");
        i++;
    }
}

from this i want remove arr[3]

Thank you

Jon Skeet · Accepted Answer · 2011-07-27 12:07:18Z

You can't "remove" elements from an array in the same way that you can from a List<T> or an ArrayList - you can only replace elements. You can copy a whole chunk of an array using Array.Copy, admittedly, but it's a bit ugly.

A better solution would be to change your code to use a List<List<string>>:

List<List<string>> list = new List<List<string>>
{
    new List<string> { "A" },
    new List<string> { "B" },
    new List<string> { "C" },
    new List<string> { "D" },
    new List<string> { "E" }
};

list.RemoveAt(3); // Removes the list containing "D"

However, whenever I see code using collections of collections, I get nervous... what's the meaning here? Could you perhaps change the "inner" list of strings to something more meaningful? If you could give us more information about the bigger picture, it would really help.

Oh, and try to avoid using the non-generic collections like ArrayList. Type safety is important :)

Jalal Said · Accepted Answer · 2011-07-27 12:06:50Z

0

A simplest thing to do is use List<ArrayList> instead of ArrayList[], you can them simply call arr.RemoveAt(3)

answered Jul 27, 2011 at 12:06

Jalal Said

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