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How can I convert ArrayList into string[] in C#?

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6 Answers

up vote 9 down vote accepted 
string[] stringArray = (string[])arrayList.ToArray(typeof(string));
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i tried this.i am getting following error on this "At least one element in the source array could not be cast down to the destination array type" – Praveen Kumar Jan 19 at 11:13
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This is how to do it. Maybe your computers got annoyed with you not using Google?! – Killercam Jan 19 at 13:58
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up vote 1 down vote 
public static string[] Convert(this ArrayList items)
{
    return items == null
        ? null
        : items.Cast<object>()
            .Select(x => x == null ? null : x.ToString())
            .ToArray();
}
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i tried this.but i am getting following error Error 'System.Collections.ArrayList' does not contain a definition for 'Select' and no extension method 'Select' accepting a first argument of type 'System.Collections.ArrayList' could be found (are you missing a using directive or an assembly reference?) – Praveen Kumar Jan 19 at 11:03
You need to include using System.Linq; at the top of the file. Also I was missing a .Cast<object>() call. – Nuffin Jan 19 at 11:04
Anyone care to explain the downvote? my answer doesn't seem that bad to me... – Nuffin Jan 19 at 12:20
Dude! My fault. I actually thought this was good and hurridly pressed the wrong button! Now it's +1! – Killercam Jan 26 at 16:09
@Killercam: Thanks :D – Nuffin Jan 26 at 21:43
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up vote 0 down vote

use .ToArray(Type)

string[] stringArray = (string[])arrayList.ToArray(typeof(string));
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emm...do I wrote something wrong, to get downvote? :/ – Reniuz Jan 19 at 11:03
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up vote 0 down vote

Try do that with ToArray() method.

ArrayList a= new ArrayList(); //your ArrayList object
var array=(String[])a.ToArray(typeof(string)); // your array!!!
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up vote 0 down vote

You can use CopyTo method of ArrayList object.

Let's say that we have an arraylist, which has String Type as Elements.

strArrayList.CopyTo(strArray)

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up vote 1 down vote

A simple Google or search on MSDN would have done it. Here:

ArrayList myAL = new ArrayList(); 

// Add stuff to the ArrayList.
String[] myArr = (String[]) myAL.ToArray( typeof( string ) );
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