public DataTable TryGetPreview()
{
//there is already a data table in memory
if (_workingTable != null)
{
return(_workingTable);
}
//we have not loaded anything yet
if (Headers == null)
{
//get a chunk
DataTable toReturn = GetChunk(new ThrowImmediatelyDataLoadEventListener(), new GracefulCancellationToken());
//clear these to close the file and reset state to 'I need to open the file again state'
CloseReader();
Headers = null;
EventHandlers = null;
DataPusher = null;
_workingTable = null;
_reader = null;
return(toReturn);
}
throw new NotSupportedException("Cannot generate preview because _headers has already been set which likely means it is already loading / didn't cleanup properly after last preview attempt?");
}
private void InitializeComponents()
{
Headers = new FlatFileColumnCollection(_fileToLoad, MakeHeaderNamesSane, ExplicitlyTypedColumns, ForceHeaders, ForceHeadersReplacesFirstLineInFile, IgnoreColumns);
DataPusher = new FlatFileToDataTablePusher(_fileToLoad, Headers, HackValueReadFromFile, AttemptToResolveNewLinesInRecords, Culture);
EventHandlers = new FlatFileEventHandlers(_fileToLoad, DataPusher, ThrowOnEmptyFiles, BadDataHandlingStrategy, _listener, MaximumErrorsToReport <= 0 ? int.MaxValue:MaximumErrorsToReport, IgnoreBadReads);
}
