Converting Excel File From .csv To .xlsx

Question

I want my application to go and find a csv excel file and convert it into a .xlsx file instead.

Here\'s what I\'m currently doing;

var fileName = @\"         


        

Answer 1

Try this class; takes in any CSV or TXT file with any delimiter including a tab and converts to Excel (.xls)

examples:

• convertToExcel(@"path to file", "\t", ".csv");

• convertToExcel(@"path to file", "\|", ".txt");

  public static void convertToExcel(string fileName, string splitter, string extension)
  {
      string newFileName = fileName.Replace("." + extension, ".xls");
  
      string[] lines = File.ReadAllLines(fileName, Encoding.UTF8);
  
      int columnCounter = 0;
  
      foreach (string s in lines)
      {
          string[] ss = s.Trim().Split(Convert.ToChar(splitter));
  
          if (ss.Length > columnCounter)
              columnCounter = ss.Length;
      }           
  
      HSSFWorkbook workbook = new HSSFWorkbook();
      var sheet = workbook.CreateSheet("Data");
      var rowIndex = 0;
      var rowExcel = sheet.CreateRow(rowIndex);
  
      foreach (string s in lines)
      {
          rowExcel = sheet.CreateRow(rowIndex);
  
          string[] ss = s.Trim().Split(Convert.ToChar(splitter));
  
          for (int i = 0; i < columnCounter; i++)
          {
              string data = !String.IsNullOrEmpty("s") && i < ss.Length ? ss[i] : "";
              rowExcel.CreateCell(i).SetCellType(CellType.String);
              rowExcel.CreateCell(i).SetCellValue(data);                    
          }
  
          rowIndex++;
      }
  
      for (var i = 0; i < sheet.GetRow(0).LastCellNum; i++)
          sheet.AutoSizeColumn(i);
  
      using (FileStream file = new FileStream(newFileName, FileMode.Create, FileAccess.Write))
      {
          workbook.Write(file);
          file.Close();
      }
  }