I started playing with Rhino-ETL over the weekend and came across
something odd. When iterating through the rows in the override Execute
method of an implementation of the AbstractOperation, the enumerable
list of rows was cleared. Is this normal behavior or did I do
something completely wrong?
My example is as follows:
namespace MySampleApp {
class PrintNumberProcess : EtlProcess {
protected override void Initialize() {
Register(new EvenNumbers(7));
Register(new PrintNumbers());
RegisterLast(new BulkInsert());
}
}
}
PrintNumbers is where I was seeing the odd behavior:
namespace MySampleApp {
class PrintNumbers : AbstractOperation {
public override IEnumerable<Row> Execute(IEnumerable<Row>
rows) {
//enumerating the Row appears to also clear the
Enumeration.
//So I'll push the contents of the Row into a list to pass
along the pipeline of operations.
List<Row> listOfRows = new List<Row>();
foreach (Row row in rows) {
Console.WriteLine(row["id"]);
listOfRows.Add(ModifyRow(row));
}
Console.WriteLine("==========");
return listOfRows.AsEnumerable();
}
private Row ModifyRow(Row r) {
r["id"] = (int)r["id"] + 1;
return r;
}
}
}
Thanks,
Mike
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