/// <summary>
/// Saves data frame .NET object in a csv file.
/// </summary>
/// <param name="filePath">Full or relative file path.</param>
/// <param name="dataFrame">Data frame to persist into file.</param>
/// <returns>True if save successfully passed</returns>
public static bool ToCsv(string filePath, DataFrame dataFrame, string dFormat)
{
if (dataFrame == null)
{
throw new ArgumentNullException(nameof(dataFrame));
}
using (var strWr = File.CreateText(filePath))
{
var csvWriter = new CsvWriter(strWr);
//write header
writeHeader(csvWriter, dataFrame.Columns);
csvWriter.NextRecord();
//write values
int lstIndex = 0;
for (int i = 0; i < dataFrame.RowCount(); i++)
{
for (int j = 0; j < dataFrame.ColCount(); j++)
{
if (dataFrame._values[lstIndex] == DataFrame.NAN)
{
csvWriter.WriteField("");
lstIndex++;
continue;
}
switch (dataFrame.ColTypes[j])
{
case ColType.I2:
var bv = Convert.ToBoolean(dataFrame._values[lstIndex]);
csvWriter.WriteField(bv.ToString(CultureInfo.InvariantCulture));
break;
case ColType.IN:
csvWriter.WriteField(dataFrame._values[lstIndex].ToString());
break;
case ColType.I32:
var iv = Convert.ToInt32(dataFrame._values[lstIndex]);
csvWriter.WriteField(iv.ToString(CultureInfo.InvariantCulture));
break;
case ColType.I64:
var lv = Convert.ToInt64(dataFrame._values[lstIndex]);
csvWriter.WriteField(lv.ToString(CultureInfo.InvariantCulture));
break;
case ColType.F32:
var df = Convert.ToSingle(dataFrame._values[lstIndex]);
csvWriter.WriteField(df.ToString(CultureInfo.InvariantCulture));
break;
case ColType.DD:
var dv = Convert.ToDouble(dataFrame._values[lstIndex]);
csvWriter.WriteField(dv.ToString(CultureInfo.InvariantCulture));
break;
case ColType.STR:
csvWriter.WriteField(dataFrame._values[lstIndex].ToString());
break;
case ColType.DT:
var dt = Convert.ToDateTime(dataFrame._values[lstIndex]);
if (dFormat != null)
{
csvWriter.WriteField(dt.ToString(dFormat));
}
else
{
csvWriter.WriteField(dt.ToString());
}
break;
}
//
lstIndex++;
}
csvWriter.NextRecord();
}
}
return(true);
}
