public async Task InitialiseAsync()
{
if (Schema == null)
{
DataSet ds = await ParquetUwp.LoadAsync(_file, 0, 0);
Schema = ds.Schema;
MaxItemCount = (int)ds.TotalRowCount;
}
}
public async Task <IList <TableRowView> > LoadRowsAsync(CancellationToken token, uint count, int baseIndex)
{
bool isInWindow = baseIndex + count < _rows.Count;
if (!isInWindow)
{
DataSet ds = await ParquetUwp.LoadAsync(_file, _rows.Count, BatchSize);
_rows.AddRange(ds);
}
var result = new List <TableRowView>((int)count);
for (int i = baseIndex; i < baseIndex + count; i++)
{
Row row = _rows[i];
result.Add(new TableRowView(row));
}
return(result);
}