/// <summary>
/// Reads a seekable stream of CSV data into a DataFrame.
/// </summary>
/// <param name="csvStream">stream of CSV data to be read in</param>
/// <param name="separator">column separator</param>
/// <param name="header">has a header or not</param>
/// <param name="columnNames">column names (can be empty)</param>
/// <param name="dataTypes">column types (can be empty)</param>
/// <param name="numberOfRowsToRead">number of rows to read not including the header(if present)</param>
/// <param name="guessRows">number of rows used to guess types</param>
/// <param name="addIndexColumn">add one column with the row index</param>
/// <param name="encoding">The character encoding. Defaults to UTF8 if not specified</param>
/// <returns><see cref="DataFrame"/></returns>
public static DataFrame LoadCsv(Stream csvStream,
char separator = ',', bool header = true,
string[] columnNames = null, Type[] dataTypes = null,
long numberOfRowsToRead = -1, int guessRows = 10, bool addIndexColumn = false,
Encoding encoding = null)
{
if (!csvStream.CanSeek)
{
throw new ArgumentException(Strings.NonSeekableStream, nameof(csvStream));
}
if (dataTypes == null && guessRows <= 0)
{
throw new ArgumentException(string.Format(Strings.ExpectedEitherGuessRowsOrDataTypes, nameof(guessRows), nameof(dataTypes)));
}
using (var streamReader = new StreamReader(csvStream, encoding ?? Encoding.UTF8, detectEncodingFromByteOrderMarks: true, DefaultStreamReaderBufferSize, leaveOpen: true))
{
CsvLineEnumerator linesEnumerator = new CsvLineEnumerator(streamReader);
IEnumerable <string> lines = new CsvLines(linesEnumerator);
return(ReadCsvLinesIntoDataFrame(lines, separator, header, columnNames, dataTypes, numberOfRowsToRead, guessRows, addIndexColumn));
}
}
public CsvLines(CsvLineEnumerator csvLineEnumerator)
{
enumerator = csvLineEnumerator;
}