need the position of pointer in memory or simply the line number

[ImSnehaChawla]

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[JoshClose]

When reading? Are you reading using var records = csv.GetRecords<Foo>(); or looping manually like while (csv.Read())?

[DaleyKD]

I would like the answer to this, as well.

I need to enumerate a potentially very large CSV. It'd be nice to know the "row number" (and possibly a way to resume from that number later).

[JoshClose]

You can get that info from the parser. csv.Parser.

void Main()
{
    var s = new StringBuilder();
    s.Append("Id,Name\r\n");
    s.Append("1,\"one\r\ntwo\"");
    var config = new CsvConfiguration(CultureInfo.InvariantCulture)
    {
    };
    using (var reader = new StringReader(s.ToString()))
    using (var csv = new CsvReader(reader, config))
    {
        while (csv.Read())
        {
            var record = csv.GetRecord<Foo>();
            record.Dump();
            csv.Parser.Row.Dump();
            csv.Parser.RawRow.Dump();
        }
    }
}

private class Foo
{
    public int Id { get; set; }
    public string Name { get; set; }
}

[JoshClose]

If you want to start back on a specific row, you can do something like:

void Main()
{
    var s = new StringBuilder();
    s.Append("Id,Name\r\n");
    s.Append("1,\"one\r\nfoo\"\r\n");
    s.Append("2,\twowo\r\n");
    var config = new CsvConfiguration(CultureInfo.InvariantCulture)
    {
    };
    using (var reader = new StringReader(s.ToString()))
    using (var csv = new CsvReader(reader, config))
    {
        var lineToStartOn = 2;
        csv.Read();
        csv.ReadHeader();        
        for (var i = 0; i < lineToStartOn - 1; i++)
        {
            csv.Read();
        }
        
        while (csv.Read())
        {
            var record = csv.GetRecord<Foo>();
            record.Dump();
            csv.Parser.Row.Dump();
            csv.Parser.RawRow.Dump();
            
        }
    }
}

private class Foo
{
    public int Id { get; set; }
    public string Name { get; set; }
}

It needs to subtract 1 because of reading the header row.