Question

I was going to use a standard array, I need it to x number of rows and be 2 columns

double[,] members = new double[x, 2];

and loop through all the results I get back and then add them to the array, but as the number of results can change I don’t want to pre-define the size of the array…

members[0, 0] = cost;
members[x, 1] = tax;
x++;

I was looking at resizing the array but would it be easier just using an arraylist or list of lists for this?

Answer 1

Perhaps the number of items in the second dimension is fixed, or at least, is predictable, so if you’re using Microsoft .NET Framework 4.0, you can use a list of tuples:

List<Tuple<double, double>> list = new List<Tuple<int, int>>();

// In your loop...
list.Add(Tuple.Create(cost, tax));

// ... later when retrieving some tuple...
int item0cost = list[0].Item1;
int item0tax = list[0].Item2;

You can always implement some kind of value object class which has Cost and Tax properties, but using tuples you can do it as easy as I shown you in my code sample.