Read or Write Record by Record

Using the FileHelperAsynEngine to work record by record

If you have a source file like this, separated by a |:

Input.txt

1732,Juan Perez,435.00,11-05-2002
554,Pedro Gomez,12342.30,06-02-2004
112,Ramiro Politti,0.00,01-02-2000
924,Pablo Ramirez,3321.30,24-11-2002

You first declare a Record Mapping Class:

RecordClass.cs

[DelimitedRecord(",")]
public class Customer
{
    public int CustId;

    public string Name;

    [FieldConverter(ConverterKind.Decimal, ".")] // The decimal separator is .
    public decimal Balance;

    [FieldConverter(ConverterKind.Date, "dd-MM-yyyy")]
    public DateTime AddedDate;

}

Instantiate a FileHelperAsyncEngine and read or write files:

Example.cs

var engine = new FileHelperAsyncEngine<Customer>();

// Read
using(engine.BeginReadFile("Input.txt"))
{
    // The engine is IEnumerable
    foreach(Customer cust in engine)
    {
        // your code here
        Console.WriteLine(cust.Name);
    }
}


// Write

var arrayCustomers = new Customer[] {
    new Customer { CustId = 1732, Name = "Juan Perez", Balance = 435.00m,
                   AddedDate = new DateTime (2020, 5, 11) },
    new Customer { CustId = 554, Name = "Pedro Gomez", Balance = 12342.30m,
                   AddedDate = new DateTime (2004, 2, 6) },
};

using(engine.BeginWriteFile("TestOut.txt"))
{
    foreach(Customer cust in arrayCustomers)
    {
        engine.WriteNext(cust);
    }
}

Console

Juan Perez
Pedro Gomez
Ramiro Politti
Pablo Ramirez