my DNA

dna.cs

void Main()
{
	var data = Load(@"C:\Users\patri\OneDrive\Desktop\AncestryDNA.txt");
	
	data.Dump();
}

public class GeneticData
{	
    private ReadOnlyMemory<char> Line { get; set; }

    public ReadOnlyMemory<char> Rsid => GetField(0);
    public ReadOnlyMemory<char> Chromosome => GetField(1);
    public ReadOnlyMemory<char> Position => GetField(2);
    public ReadOnlyMemory<char> Allele1 => GetField(3);
    public ReadOnlyMemory<char> Allele2 => GetField(4);

	private ReadOnlyMemory<char> GetField(int index)
	{
		var span = Line.Span;
		var start = 0;
		for (var i = 0; i < index; i++)
		{
			start = span.IndexOf('\t') + 1;
			span = span.Slice(start);
		}
		var end = span.IndexOf('\t');
		if (end == -1) end = span.Length; // Last field
		return Line.Slice(start, end);
	}
	
	private GeneticData(ReadOnlyMemory<char> line)
	{
		Line = line;
	}
	
	public static GeneticData FromLine(string line) => new GeneticData(line.AsMemory());
}

public static ImmutableArray<GeneticData> Load(string filePath)
{
	var lines = File.ReadAllLines(filePath);
	var builder = ImmutableArray.CreateBuilder<GeneticData>(lines.Length - 1);

	foreach (var line in lines.Skip(1))
	{
		builder.Add(GeneticData.FromLine(line));
	}

	return builder.ToImmutableArray();
}