using System;

using System.Globalization;

using RecordParser.Builders.Reader;

using RecordParser.Extensions;

using System.IO;

​

var fileContent = 

    """

    Id,Reference,Amount

    1,123456789,30

    18,123-456-789,60.25

    """;

​

// I am using StringReader because in the example the content is a string

// but could be StreamReader or any TextReader

using TextReader textReader = new StringReader(fileContent);

​

var headerRow = textReader.ReadLine();

var headerFields = headerRow.Split(",");

​

Console.WriteLine(headerRow);

​

// your validation can be done here

if (headerFields[0] != "Id" || headerFields[1] != "Reference" || headerFields[2] != "Amount")

    throw new Exception ("some header is different of expected");

​

var builder = new VariableLengthReaderBuilder<Record>()

    .Map(x => x.Id, 0)

    .Map(x => x.Reference, 1)

    .Map(x => x.Amount, 2);

​

var reader = builder.Build(",", CultureInfo.InvariantCulture);

var readerOptions = new VariableLengthReaderOptions

{

    // false because we already consumed header manually

    HasHeader = false,

    ContainsQuotedFields = false,

    ParallelismOptions = new()

    {

        Enabled = true,

        EnsureOriginalOrdering = true,

    }

};

​

var records = textReader.ReadRecords(reader, readerOptions);

​

foreach(var r in records)

{

    Console.WriteLine(r);

}

​

public record class Record(int Id, string Reference, decimal Amount);