IComparable -> using generics gives me error

[serializer]

I am using the code below. The code that is commented out is when I don't use the generic CompareTo which works. This code gives me error: Failed to compare two elements in the array.

Why does this happen? I would rather use the Generic one.

private void Form1_Load(object sender, EventArgs e)
{
ArrayList arr = new ArrayList();
arr.Add(new POrder());
POrder p2 = new POrder();
p2.Order = 1;
arr.Add(p2);
arr.Sort();
foreach (POrder p in arr)
{
Console.WriteLine(p.Order.ToString());
}
}
}

public class POrder : IComparable<POrder>
{
public int Order = 2;

//#region IComparable Members

//public int CompareTo(object obj)
//{
// POrder emp = (POrder)obj;
// return Order.CompareTo(emp.Order);

//}

//#endregion

#region IComparable<POrder> Members

public int CompareTo(POrder other)
{
return Order.CompareTo(other.Order);
}

#endregion
}

 

[CrashDome]

I'm just getting into generics myself but I would think it would have to do with the fact you are using an ArrayList without any generic type.

Try:

   private void Form1_Load(object sender, EventArgs e)
        {
            List<POrder> arr = new List<POrder>();
            arr.Add(new POrder());
            POrder p2 = new POrder();
            p2.Order = 1;
            arr.Add(p2);
            arr.Sort();
            foreach (POrder p in arr)
            {
                Console.WriteLine(p.Order.ToString());
            }
        }
    }

 

[chiph]

Right, you would use List<>, not ArrayList.

Chip H.


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