C# convert csv to xls (using existing csv file)

Question

i believe here are lot a discussion with this matter. but i read all post and try but it never work with c#. my goal is simple that i have existing csv file. just want conve

Answer 1

If you want to proceed with OpenXML then you can follow this.

install the nuget package

Install-Package DocumentFormat.OpenXml -Version 2.11.3

Read the CSV file yourself as a text file (Example from above answer):

private IEnumerable ReadCsv(string fileName, char delimiter = ';')
{
    var lines = System.IO.File.ReadAllLines(fileName, Encoding.UTF8).Select(a => a.Split(delimiter));
    return (lines);
}

OpenXML code:

private bool ConvertWithOpenXml(string excelFileName, string worksheetName, IEnumerable csvLines)
        {
            if (csvLines == null || csvLines.Count() == 0)
            {
                return (false);
            }
            using (SpreadsheetDocument package = SpreadsheetDocument.Create(excelFileName, SpreadsheetDocumentType.Workbook, true))
            {
                package.AddWorkbookPart();
                package.WorkbookPart.Workbook = new Workbook();
                package.WorkbookPart.AddNewPart();
                SheetData xlSheetData = new SheetData();
                foreach (var line in csvLines)
                {
                    Row xlRow = new Row();
                    foreach (var col in line)
                    {
                        Cell xlCell = new Cell(new InlineString(new Text(col.ToString()))) { DataType = CellValues.InlineString };
                        xlRow.Append(xlCell);
                    }
                    xlSheetData.Append(xlRow);
                }
                package.WorkbookPart.WorksheetParts.First().Worksheet = new Worksheet(xlSheetData);
                package.WorkbookPart.WorksheetParts.First().Worksheet.Save();

            
                // create the worksheet to workbook relation
                package.WorkbookPart.Workbook.AppendChild(new Sheets());
                package.WorkbookPart.Workbook.GetFirstChild().AppendChild(new Sheet()
                {
                    Id = package.WorkbookPart.GetIdOfPart(package.WorkbookPart.WorksheetParts.First()),

                    SheetId = 1,

                    Name = worksheetName

                });

                package.WorkbookPart.Workbook.Save();
            }
            return (true);
        }