Question

In my program I want to import csv files that only should have a pair of doubles in them. Something like:

2.2131321321, 32.321321321
3.31321321321, 65.65454545
4.12321351351, 16.13211212

Can you help finding out a safe and fast way of doing so?

Answer 1

The easiest way is read file line by line, split every line by , and try to parse each part using double.TryParse

Simple sample, assuming that file is valid (without check):

public static IEnumerable<Tuple<double, double>> ReadCSV(string filePath)
{
    using (var reader = new StreamReader(filePath))
    {
        string line;
        while ((line = reader.ReadLine()) != null)
        {
            var split = line.Split(new[] { ',' },
                StringSplitOptions.RemoveEmptyEntries);

            yield return new Tuple<double, double>(
                double.Parse(split[0], CultureInfo.InvariantCulture),
                double.Parse(split[1], CultureInfo.InvariantCulture));
        }
    }
}