private IDataItem ReadNext(object taskState)
{
var readOutput = (ReadOutputByRef)taskState;
try
{
if (file == null)
{
file = File.OpenText(configuration.FileName);
csvReader = new CsvReader(file);
}
if (!csvReader.Read())
{
return(null);
}
// Unfortunatelly there is no support for mapping to a Dictionary yet.
// Use dynamic workaround https://github.com/JoshClose/CsvHelper/issues/187
var record = csvReader.GetRecord <dynamic>() as IDictionary <string, object>;
return(NestedDataItem.Create(record, configuration.NestingSeparator));
}
finally
{
if (csvReader != null)
{
// If it fails on the first read - it will throw an exception from Row property
try { rowNumber = csvReader.Row; } catch { }
}
readOutput.DataItemId = String.Format(CultureInfo.InvariantCulture,
Resources.DataItemIdFormat, configuration.FileName, rowNumber);
}
}
public override async Task <IDataItem> ReadNextAsync(ReadOutputByRef readOutput, CancellationToken cancellationToken)
{
readOutput.DataItemId = String.Format(CultureInfo.InvariantCulture, Resources.DataItemIdFormat, ++rowNumber);
while (!await dataReader.ReadAsync(cancellationToken))
{
if (!await dataReader.NextResultAsync())
{
return(null);
}
}
var dataItem = NestedDataItem.Create(Configuration.NestingSeparator);
for (var fieldIndex = 0; fieldIndex < dataReader.FieldCount; ++fieldIndex)
{
dataItem.AddProperty(
dataReader.GetName(fieldIndex),
dataReader.GetValue(fieldIndex));
}
return(dataItem);
}
private IDataItem ReadNext()
{
var values = reader.Read();
if (values == null)
{
return(null);
}
if (values.Count != header.Count)
{
throw Errors.InvalidNumberOfColumns(values.Count, header.Count);
}
var dataItem = NestedDataItem.Create(configuration.NestingSeparator);
for (var index = 0; index < header.Count; ++index)
{
dataItem.AddProperty(header[index], values[index]);
}
return(dataItem);
}
