INotifyWrite Interface

Get Before/After Write events with the INotifyWrite interface

Input.txt

10249   TOMSP  05071996      11.61
10250   HANAR  08071996       0.00
10251   VICTE  08071996      41.34
10269   TOMSP  05071996      11.61
10230   HANAR  08071996      65.83
10151   VICTE  08071996      41.34

Report layout.cs

[FixedLengthRecord]
[IgnoreEmptyLines]
public class OrdersFixed
    :INotifyWrite
{
    [FieldFixedLength(7)]
    public int OrderID;

    [FieldFixedLength(8)]
    public string CustomerID;

    [FieldFixedLength(8)]
    public DateTime OrderDate;

    [FieldFixedLength(11)]
    public decimal Freight;

    public void BeforeWrite(BeforeWriteEventArgs e)
    {  
        //  We only want clients with large frieght values
        if (Freight < 40)
            e.SkipThisRecord = true;
    }

    public void AfterWrite(AfterWriteEventArgs e)
    {
        //  Hide a line
        if (CustomerID.Trim() == "HANAR")
            e.RecordLine = "-- Insufficient Access";
    }
}

Run a record through engine using the write event to filter out unwanted details

RunEngine.cs

var engine = new FileHelperEngine<OrdersFixed>();

var result = engine.ReadFile("Input.txt");

engine.WriteFile("output.txt", result);

output.txt

  10251 VICTE  08071996      41.34
-- Insufficient Access
  10151 VICTE  08071996      41.34