数字格式

//integer (not really needed unless you need to round numbers, Excel with use default cell properties)
worksheet.Cells["A1:A25"].Style.Numberformat.Format = "0";

//integer without displaying the number 0 in the cell
worksheet.Cells["A1:A25"].Style.Numberformat.Format = "#";

//number with 1 decimal place
worksheet.Cells["A1:A25"].Style.Numberformat.Format = "0.0";

//number with 2 decimal places
worksheet.Cells["A1:A25"].Style.Numberformat.Format = "0.00";

//number with 2 decimal places and thousand separator
worksheet.Cells["A1:A25"].Style.Numberformat.Format = "#,##0.00";

//number with 2 decimal places and thousand separator and money symbol
worksheet.Cells["A1:A25"].Style.Numberformat.Format = "€#,##0.00";

//percentage (1 = 100%, 0.01 = 1%)
worksheet.Cells["A1:A25"].Style.Numberformat.Format = "0%";