Spire.XLS 16.2.4 が LET および MAP 関数に対応しました

Workbook workbook = new Workbook();
            Worksheet sheet = workbook.Worksheets[0];
            sheet.Range["C1"].Text = "out";
            sheet.Range["C2"].Formula = "=LET(x, 5, y, 10, x + y)";
            sheet.Range["C3"].Formula = "=LET(a, 1, b, 2, c, 3, d, 4, a+b+c+d)";
            sheet.Range["C4"].Formula = "=LET(outer, LET(inner, 5, inner*2), outer+10)";
            sheet.Range["C5"].Formula = "=LET(x, 5, y, x*2, z, y+3, z*2)"; 
            sheet.Range["C2"].Formula = "=MAP(A2:A4, LAMBDA(x, x*2))";
            sheet.Range["D2"].Formula = "=MAP(A2:A4,LAMBDA(x,x*10+1))";
            sheet.Range["A8"].Formula = "=MAP(A2:B4,C2:D4,LAMBDA(x,y,SUM(x,y)))";