void Main()
{
    IWorkbook workbook1 =null;
    workbook1 = new XSSFWorkbook(@"C:\temp\访谈记录（202210）01.xlsx");
    XSSFSheet sheet1 = (XSSFSheet) workbook1.GetSheetAt(0);

    IWorkbook workbook2 = null;
    workbook2 = new XSSFWorkbook(@"C:\temp\访谈记录（202210）02.xlsx");
    XSSFSheet sheet2 = (XSSFSheet) workbook2.GetSheetAt(0);

    IWorkbook workbook3 = null;
    workbook3 = new XSSFWorkbook(@"C:\temp\访谈记录（202210）03.xlsx");
    XSSFSheet sheet3 = (XSSFSheet) workbook3.GetSheetAt(0);

    //将sheet复制到一个文件里   
    sheet2.CopyTo(workbook1, "02", true, true);
    sheet3.CopyTo(workbook1, "03", true, true);

    //读取相应的sheet
    XSSFSheet sheet1_2 = (XSSFSheet) workbook1.GetSheetAt(2);
    XSSFSheet sheet1_3 = (XSSFSheet) workbook1.GetSheetAt(3);

    //找出sheet1的第一个空行index

    //复制行CopyRow(ISheet sourceSheet, int sourceRowIndex, ISheet targetSheet, int targetRowIndex)

    SheetUtil.CopyRow(sheet1_2, 3, sheet1, 9);
    SheetUtil.CopyRow(sheet1_2, 4, sheet1, 10);
    SheetUtil.CopyRow(sheet1_2, 5, sheet1, 11);
    SheetUtil.CopyRow(sheet1_2, 6, sheet1, 12);
    SheetUtil.CopyRow(sheet1_2, 7, sheet1, 13);
    SheetUtil.CopyRow(sheet1_2, 8, sheet1, 14);

    SheetUtil.CopyRow(sheet1_3, 3, sheet1, 15);
    SheetUtil.CopyRow(sheet1_3, 4, sheet1, 16);
    SheetUtil.CopyRow(sheet1_3, 5, sheet1, 17);

    FileStream file = new FileStream(@"C:\temp\qq"+ DateTime.Now.ToString("MMddHHmmss") +".xlsx",FileMode.Create);
    workbook1.Write(file,true);
    file.Close();
}