/// <summary>
/// Take a CSV file and chop it into multiple chunks of a specified maximum size.
/// </summary>
/// <param name="filename">The input filename to chop</param>
/// <param name="out_folder">The folder where the chopped CSV will be saved</param>
/// <param name="maxLinesPerFile">The maximum number of lines to put into each file</param>
/// <param name="settings">The CSV settings to use when chopping this file into chunks (Default: CSV)</param>
/// <returns>Number of files chopped</returns>
public static int ChopFile(string filename, string out_folder, int maxLinesPerFile, CSVSettings settings = null)
{
// Default settings
if (settings == null)
{
settings = CSVSettings.CSV;
}
// Let's begin parsing
int file_id = 1;
int line_count = 0;
string file_prefix = Path.GetFileNameWithoutExtension(filename);
string ext = Path.GetExtension(filename);
CSVWriter cw = null;
StreamWriter sw = null;
// Read in lines from the file
using (var sr = new StreamReader(filename))
{
using (CSVReader cr = new CSVReader(sr, settings))
{
// Okay, let's do the real work
foreach (string[] line in cr.Lines())
{
// Do we need to create a file for writing?
if (cw == null)
{
string fn = Path.Combine(out_folder, file_prefix + file_id.ToString() + ext);
sw = new StreamWriter(fn);
cw = new CSVWriter(sw, settings);
if (settings.HeaderRowIncluded)
{
cw.WriteLine(cr.Headers);
}
}
// Write one line
cw.WriteLine(line);
// Count lines - close the file if done
line_count++;
if (line_count >= maxLinesPerFile)
{
cw.Dispose();
cw = null;
file_id++;
line_count = 0;
}
}
}
}
// Ensore the final CSVWriter is closed properly
if (cw != null)
{
cw.Dispose();
cw = null;
}
return(file_id);
}
/// <summary>
/// Take a CSV file and chop it into multiple chunks of a specified maximum size.
/// </summary>
/// <param name="filename"></param>
/// <param name="out_folder"></param>
/// <param name="first_row_are_headers"></param>
/// <param name="max_lines_per_file"></param>
/// <returns>Number of files chopped</returns>
public static int ChopFile(string filename, string out_folder, bool first_row_are_headers, int max_lines_per_file, char delim = CSV.DEFAULT_DELIMITER, char qual = CSV.DEFAULT_QUALIFIER)
{
int file_id = 1;
int line_count = 0;
string file_prefix = Path.GetFileNameWithoutExtension(filename);
string ext = Path.GetExtension(filename);
CSVWriter cw = null;
// Read in lines from the file
using (CSVReader cr = new CSVReader(filename, delim, qual, first_row_are_headers)) {
// Okay, let's do the real work
foreach (string[] line in cr.Lines())
{
// Do we need to create a file for writing?
if (cw == null)
{
string fn = Path.Combine(out_folder, file_prefix + file_id.ToString() + ext);
cw = new CSVWriter(fn, delim, qual);
if (first_row_are_headers)
{
cw.WriteLine(cr.Headers);
}
}
// Write one line
cw.WriteLine(line);
// Count lines - close the file if done
line_count++;
if (line_count >= max_lines_per_file)
{
cw.Dispose();
cw = null;
file_id++;
line_count = 0;
}
}
}
// Ensore the final CSVWriter is closed properly
if (cw != null)
{
cw.Dispose();
cw = null;
}
return(file_id);
}