How to access an elements of a multidimensional ArrayList.

Question

2.33/5 (3 votes)

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We have a class:

class Node
    {
        private string gid;
        private string name;

public Node(string gimid, string ptyname)  // constructor
 {
     gid = gimid;
     name = ptyname;
 }

        public string gmid          // property
        {
            get { return gid; }
            set { gid = value; }
        }

        public string pname         // property
        {
            get { return name; }
            set { name = value; }
        }

}

And an ArrayList that will be holding above table’s structure to store records as follows:

ArrayList mapList = new new ArrayList(); 
string FirstElementID = ds.Tables[0].Rows[0]["Pty_id"].ToString();                          string FirstElementName = ds.Tables[0].Rows[0]["Pty_Name"].ToString();    
Node FirstNode = new Node(FirstElementID, FirstElementName);    
 	mapList.Add(FirstNode);

Now the question is how to access elements from this ArrayList?

Posted 4-Jun-11 23:31pm

sk saini

Updated 5-Jun-11 15:26pm

Sergey Alexandrovich Kryukov

v3

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Comments

Wonde Tadesse 5-Jun-11 16:06pm

Which part is multidimensional ArrayList ? I can only see a single dimensional ArrayList.

Sergey Alexandrovich Kryukov 5-Jun-11 21:28pm

Imaginary :-)
--SA

Wonde Tadesse 5-Jun-11 23:16pm

I don't get it.

Sergey Alexandrovich Kryukov 5-Jun-11 23:33pm

I mean you were perfectly right, nothing multidimensional, my note was sarcastic, you could pay attention for the smile.
By the way, to me all dimensions of all structures are guess what? They are all zero-dimensional. It depends on the definition of dimension.
--SA

Wonde Tadesse 5-Jun-11 23:41pm

I get it.

2 solutions

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Kim Togo · Accepted Answer · 2011-06-05T01:38:00

Solution 2

You can rewrite it to

C#

List<Node> mapList = new List<Node>()

foreach (DataRow row in ds.Tables[0].Rows)
{
  mapList.Add(new Node(row["Pty_id"].ToString(), row["Pty_Name"].ToString()));
}

And when you are done adding elements to the List. You can access, add, insert and modify the List as needed.

But it has nothing to do with a multidimensional array.

Posted 5-Jun-11 1:38am

Kim Togo

Comments

Sergey Alexandrovich Kryukov 5-Jun-11 21:28pm

My 5.
--SA

Kim Togo 6-Jun-11 2:44am

Thanks SA

Manfred Rudolf Bihy · Accepted Answer · 2011-06-04T23:42:00

Solution 1

I suggest you replace ArrayList with its generic counterpart List<T> where T is the type of elements in the list. In your code that would be Node. Please read about it here: http://en.csharp-online.net/CSharp_Generics_Recipes%E2%80%94Replacing_the_ArrayList_with_Its_Generic_Counterpart[^].
That way when you access an element from that list the type will already be known and you can access all of Node's members directly without using a cast operation.

Cheers!

Posted 4-Jun-11 23:42pm

Manfred Rudolf Bihy

Comments

Espen Harlinn 5-Jun-11 6:12am

Good point, my 5

Manfred Rudolf Bihy 5-Jun-11 7:54am

Thank you!

Kim Togo 5-Jun-11 8:36am

Good point, my 5. Replacing ArrayList with List<T> is much better.

Sergey Alexandrovich Kryukov 5-Jun-11 21:27pm

Sure, my 5.
--SA