pedoc / csvhelper.excel

Csv Helper for Excel

CsvHelper for Excel is an extension that links 2 excellent libraries, CsvHelper and ClosedXml. It provides an implementation of ICsvParser and ICsvSerializer from CsvHelper that read and write to Excel using ClosedXml.

ExcelParser

ExcelParser implements IParser and allows you to specify the path of the workbook or a stream.

When the path is passed to the constructor then the workbook loading and disposal is handled by the parser. By default the first worksheet is used as the data source.

using var reader = new CsvReader(new ExcelParser("path/to/file.xlsx"));
var people = reader.GetRecords<Person>();

When an instance of stream is passed to the constructor then disposal will not be handled by the parser. By default the first worksheet is used as the data source.

var bytes = File.ReadAllBytes("path/to/file.xlsx");

using var stream = new MemoryStream(bytes);
using var parser = new ExcelParser(stream);
using var reader = new CsvReader(parser);

var people = reader.GetRecords<Person>();
// do other stuff with workbook

All constructor options have overloads allowing you to specify your own CsvConfiguration, otherwise the default is used.

ExcelWriter

ExcelWriter inherits from CsvWriter and, like ExcelParser, allows you to specify the path to which to (eventually) save the workbook or a stream.

When the path is passed to the constructor the creation and disposal of both the workbook and worksheet (defaultly named "Export") as well as the saving of the workbook on dispose, is handled by the serialiser.

using (var writer = new ExcelWriter("path/to/file.xlsx"))
{
    writer.WriteRecords(people);
}

When an instance of stream is passed to the constructor the creation and disposal of a new worksheet (defaultly named "Export") is handled by the serialiser, but the workbook will not be saved.

using var stream = new MemoryStream();
using (var excelWriter = new ExcelWriter(stream, CultureInfo.InvariantCulture))
{
    excelWriter.WriteRecords(people);
}
//has to be disposed to write to the stream before accessing it.

//other stuff
var bytes = stream.ToArray();

All constructor options have overloads allowing you to specify your own CsvConfiguration, otherwise the default is used.