/// <summary>
/// Opens the file with a specified maxium number of rows with a default value that insures
/// the max this code can handle isn't reached.
/// </summary>
/// <param name="filename"></param>
/// <param name="maxRows"></param>
public void OpenFile(string filename, int maxRows = Int32.MaxValue)
{
ColumnSelectorsVisible = false;
if (_linesProvider != null)
{
_linesProvider.Dispose();
_linesProvider = null;
}
// Select low level lines provider as being a binary lines provider, or a text line provider
BigFileLine lineConverter = _binaryMode ? (BigFileLine)(new BigBinFileLine()) : (BigFileLine)(new BigTextFileLine());
OpenProvider(new FileLinesProvider(filename, maxRows, lineConverter));
}
/// <summary>
/// Initializes a new instance of the <see cref="DemoCustomerProvider"/> class.
/// </summary>
/// <param name="count">The count.</param>
/// <param name="fetchDelay">The fetch delay.</param>
public FileLinesProvider(string inputFilename, int maxRows, BigFileLine lineConverter)
{
_maxRows = maxRows;
_lineConverter = lineConverter;
_inputFilename = inputFilename;
_inputStream = new FileStream(inputFilename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
var firstLine = _lineConverter.GetLines(_inputStream, 0, 1).FirstOrDefault();
if (firstLine != null)
{
Header = firstLine.Columns.Aggregate((a, b) => a + "," + b);
}
_lineCountTask = Task.Run(() => CountLines(inputFilename, maxRows));
}