Query on ArrayList - How to access

[Rauland]

Hi
I´d like to know how to access the data from an arrayList which is inside another arrayList.

//I create two arraylists.
ArrayList myArray1 = new ArrayList();
ArrayList myArray2 = new ArrayList();

//Add data to myArray1

            myArray1.Add("Array1string1");
            myArray1.Add("Array1string2");

//Add data to myArray2.

            myArray2.Add("Array2String1");

//Add myArrayList2 to myArrayList1

            myArray1.Add(myArray2);

My question is , how could I print on screen or access the data from the second array, as per:

Accessing data from index 0 and 1.

          myArray1[0].ToString() +"\n";
          myArray1[1].ToString();

How would I access data from index 2 ? Which is in this case an arraylist.

Thanks!

[popskie]

Hi
I´d like to know how to access the data from an arrayList which is inside another arrayList.

//I create two arraylists.
ArrayList myArray1 = new ArrayList();
ArrayList myArray2 = new ArrayList();

//Add data to myArray1

            myArray1.Add("Array1string1");
            myArray1.Add("Array1string2");

//Add data to myArray2.

            myArray2.Add("Array2String1");

//Add myArrayList2 to myArrayList1

            myArray1.Add(myArray2);

My question is , how could I print on screen or access the data from the second array, as per:

Accessing data from index 0 and 1.

          myArray1[0].ToString() +"\n";
          myArray1[1].ToString();

How would I access data from index 2 ? Which is in this case an arraylist.

Thanks!

same as you access as you give in your sample. just put 2 inside the bracket.
ex. myArray1[2].ToString();

[popskie]

Sorry I post a wrong answer

ArrayList test = (ArrayList)al1[2];
System.Console.WriteLine(test[0]);

or you could do these one

System.Console.WriteLine(((ArrayList)al1[2])[0]);

[penagate]

You haven't said what .NET version you're using. There are buttons for this on the New Thread page; please use them in future so that we avoid any confusion and wasted time.

If you're using .NET 2.0, you should use generic Lists, then you can avoid the casting mess.

[Rauland]

Sorry I post a wrong answer

ArrayList test = (ArrayList)al1[2];
System.Console.WriteLine(test[0]);

or you could do these one

System.Console.WriteLine(((ArrayList)al1[2])[0]);

Thanks!

[Rauland]

You haven't said what .NET version you're using. There are buttons for this on the New Thread page; please use them in future so that we avoid any confusion and wasted time.

If you're using .NET 2.0, you should use generic Lists, then you can avoid the casting mess.

I am using .NET 2.0, How would you go about this using generic Lists?
Cheers!

[penagate]

List<string> or List<List<string>>. However, you can't have different types. What you are doing is a bad practice. If your goal is to create some sort of tree structure, make a class to represent each node, which can contain children. Otherwise, if you just want a fixed-depth list of lists of strings, use List<List<string>>.

[popskie]

I am using .NET 2.0, How would you go about this using generic Lists?
Cheers!

As what Penagate said if your using 2.0 then can do this

List<List<string>> l1 = new List<List<string>>();
            List<string> l2 = new List<string>();
            l2.Add("Your Data");
            l1.Add(l2);
            System.Console.WriteLine((l1[0])[0]);

[penagate]

Why not just l1[0][0].

[popskie]

Why not just l1[0][0].

OK LOL