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Quick ArrayList Question

 
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Quick ArrayList Question
cbr4rusty
post 1 Jun, 2008 - 05:53 PM
Post #1


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Joined: 15 Apr, 2008
Posts: 25
How can I determine whether an index of myList has a value or not?
I doesn't seem to work if I test it to null (or try to convert it to a string and test it to null).

CODE

                        if (Count == 4)
                        {
                            if (myList[4] == null)
                            {
                                myList.Remove(myList[4]);
                            }
                        }
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Martyr2
post 1 Jun, 2008 - 07:15 PM
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Well this will be dependent on how you are storing the value. For instance if I purposely store a null value, I can test for that null value just fine.

csharp

private void button1_Click(object sender, EventArgs e)
{
            ArrayList a = new ArrayList();

            a.Add(1);
            a.Add(null);
            a.Add(3);
            a.Add(5);

            if (a[1] == null) { MessageBox.Show("Is empty"); }
            
}


But if you are talking about an empty string being placed in, then you will have to compare it to an empty string. You could use String.IsNullOrEmpty() for that sort of comparison.

So hopefully one of those choices helps you out. It all depends on how you are storing values.

Hope that helps. smile.gif
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