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string sep = ";";

using (StreamWriter sw = File.CreateText(path))
{
   foreach (var item in container)
   {
       string value = null, fct = null, incr = null;

       foreach (var function in item.getFunction)
       {
           value = function[0];
           fct = function[1];
           incr = function[2];
           break;
       }
       sw.WriteLine(item.getNameInt + sep
                      + item.getName + sep
                      + item.getDek + sep
                      + item.getLok + sep
                      + item.getRef + sep
                      + item.getRW + sep
                      + item.getSign + sep
                      + item.getSNA + sep
                      + item.getLength + sep
                      + value + sep
                      + fct + sep
                      + incr);
   }
}					

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public void exportXLS(List<signFlow> container)
        {
            //Variablen
            string colLast = "L";
            int rowCurrent = 1;
            object n = System.Reflection.Missing.Value;

            //start excel
            Excel.Application excapp = new Excel.Application();
            //excapp.Visible = true;
            var workbook = excapp.Workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet);
            var sheet = (Excel.Worksheet)workbook.Sheets[1]; //indexing starts from 1

            //Excel befüllen
            foreach (signFlow flow in container)
            {
                int colCurrent = 1;

                sheet.Cells[rowCurrent, colCurrent] = flow.getName;
                colCurrent++;
                sheet.Cells[rowCurrent, colCurrent] = flow.getDek;
                colCurrent++;
                sheet.Cells[rowCurrent, colCurrent] = flow.getLok;
                colCurrent++;
                sheet.Cells[rowCurrent, colCurrent] = flow.getRef;
                colCurrent++;
                sheet.Cells[rowCurrent, colCurrent] = flow.getRW;
                colCurrent++;
                sheet.Cells[rowCurrent, colCurrent] = flow.getSign;
                colCurrent++;
                sheet.Cells[rowCurrent, colCurrent] = flow.getSNA;
                colCurrent++;
                sheet.Cells[rowCurrent, colCurrent] = flow.getLength;
                colCurrent++;
                if (flow.getFunction.Count >= 1)
                {
                    foreach (string[] function in flow.getFunction)
                    {
                        sheet.Cells[rowCurrent, colCurrent] = value;
                        colCurrent++;
                        sheet.Cells[rowCurrent, colCurrent] = fct;
                        colCurrent++;
                        sheet.Cells[rowCurrent, colCurrent] = incr;
                        colCurrent++;
                        if (flow.getFunction.Count > 1)
                            rowCurrent++;
                        colCurrent -= 3;
                    }
                }
                rowCurrent++;
            }

            // Excel formatieren
            // Schriftart
            sheet.get_Range("A1", colLast + rowCurrent).Font.Name = "Arial Narrow";
            // Schriftgröße
            sheet.get_Range("A1", colLast + rowCurrent).Font.Size = 8;
            // Fettschrift
            sheet.get_Range("A1", colLast + "1").Font.Bold = true;
            // Orientierung aufwärts
            sheet.get_Range("M1", "U1").Orientation = Excel.XlOrientation.xlUpward;
            // Ausrichtung linksbündig
            sheet.get_Range("A1", colLast + "1").HorizontalAlignment = Excel.XlHAlign.xlHAlignLeft;
            // Spaltenbreite
            sheet.get_Range("A1", "A1").ColumnWidth = 20;
            sheet.get_Range("B1", "B1").ColumnWidth = 20;
            sheet.get_Range("C1", "C1").ColumnWidth = 13;
            sheet.get_Range("D1", "D1").ColumnWidth = 12;
            sheet.get_Range("E1", "E1").ColumnWidth = 20;
            sheet.get_Range("F1", "F1").ColumnWidth = 20;
            sheet.get_Range("G1", "G1").ColumnWidth = 8;
            sheet.get_Range("H1", "H1").ColumnWidth = 8;
            sheet.get_Range("I1", "I1").ColumnWidth = 14;
            sheet.get_Range("J1", "J1").ColumnWidth = 6;
            sheet.get_Range("K1", "K1").ColumnWidth = 15;
            sheet.get_Range("L1", "L1").ColumnWidth = 30;
            // Zeilenumbruch
            sheet.get_Range("A1", colLast + rowCurrent).Cells.WrapText = true;
            // Autofilter
            sheet.get_Range("A1", colLast + rowCurrent).AutoFilter(1, Type.Missing, Excel.XlAutoFilterOperator.xlAnd, Type.Missing, true);    // rowCurrent - 1, wenn %Ende% entfällt
            // Fenster fixieren
            Excel.Range firstRow = sheet.get_Range("B2", "B2");
            firstRow.Activate();
            firstRow.Select();
            firstRow.Application.ActiveWindow.FreezePanes = true;

            //Datei speichern und workbook schließen
            workbook.SaveAs("D:\\Markus_Ehinger\\C#-Versuche\\Files einlesen\\klasse_zu_xls\\ConsoleApplication1\\Exports\\export.xls", n, n,
                    n, n, n, Excel.XlSaveAsAccessMode.xlNoChange,
                    n, n, n, n, n);
            workbook.Close(false, n, n);

            //Variablen auf Null setzen
            sheet = null;
            workbook = null;
        }
    
    }					

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using CarlosAg.ExcelXmlWriter;