string fileName = "出勤明细" + DateTime.Now.ToString("yyyyMMdd");                    //导出成Excel                    var Result = officeHp.DtToExcel(attendDt, "XXX", new string[] { "序号", "班级名称", "学生姓名", "学生学号", "手机号", "签到时间" }, "考勤明细", fileName);

/// <summary>          /// DataTable 导出到 Excel          /// </summary>          /// <param name="dt">数据表</param>          /// <param name="captions">要导出的列标题</param>          /// <param name="fieldNames">要导出的列名</param>          /// <param name="sheetName">工作簿名称</param>            public string DtToExcel(DataTable dt, string captions, string[] fieldNames, string sheetName, string fileName)        {            //第一步判断给出标题和查出来的数据是否相同            if (dt.Columns.Count != fieldNames.Length) { return "ERROR"; }            Workbook workbook = new Workbook(); //工作簿             Worksheet sheet = workbook.Worksheets[0]; //工作表             sheet.Name = sheetName;    //设置工作表的名称            Cells cells = sheet.Cells;//单元格             //为标题设置样式                 Style styleTitle = workbook.Styles[workbook.Styles.Add()];//新增样式             styleTitle.HorizontalAlignment = TextAlignmentType.Center;//文字居中             styleTitle.Font.Name = "宋体";//文字字体             styleTitle.Font.Size = 18;//文字大小             styleTitle.Font.IsBold = true;//粗体             //样式2             Style style2 = workbook.Styles[workbook.Styles.Add()];//新增样式             style2.HorizontalAlignment = TextAlignmentType.Center;//文字居中             style2.Font.Name = "宋体";//文字字体             style2.Font.Size = 14;//文字大小             style2.Font.IsBold = true;//粗体             style2.IsTextWrapped = true;//单元格内容自动换行             style2.Borders[BorderType.LeftBorder].LineStyle = CellBorderType.Thin;            style2.Borders[BorderType.RightBorder].LineStyle = CellBorderType.Thin;            style2.Borders[BorderType.TopBorder].LineStyle = CellBorderType.Thin;            style2.Borders[BorderType.BottomBorder].LineStyle = CellBorderType.Thin;            //样式3             Style style3 = workbook.Styles[workbook.Styles.Add()];//新增样式             style3.HorizontalAlignment = TextAlignmentType.Center;//文字居中             style3.Font.Name = "宋体";//文字字体             style3.Font.Size = 12;//文字大小             style3.Borders[BorderType.LeftBorder].LineStyle = CellBorderType.Thin;            style3.Borders[BorderType.RightBorder].LineStyle = CellBorderType.Thin;            style3.Borders[BorderType.TopBorder].LineStyle = CellBorderType.Thin;            style3.Borders[BorderType.BottomBorder].LineStyle = CellBorderType.Thin;            int Colnum = dt.Columns.Count;//表格列数             int Rownum = dt.Rows.Count;//表格行数             //生成行1 标题行                cells.Merge(0, 0, 1, Colnum);//合并单元格             cells[0, 0].PutValue(captions);//填写内容             cells[0, 0].SetStyle(styleTitle);            cells.SetRowHeight(0, 38);            //生成行2 列名行             for (int i = 0; i < Colnum; i++)            {                //cells[1, i].PutValue(dt.Columns[i].ColumnName);                cells[1, i].PutValue(fieldNames[i]);                cells[1, i].SetStyle(style2);                cells.SetRowHeight(1, 25);            }            //生成数据行             for (int i = 0; i < Rownum; i++)            {                for (int k = 0; k < Colnum; k++)                {                    cells[2 + i, k].PutValue(dt.Rows[i][k].ToString());                    cells[2 + i, k].SetStyle(style3);                }                cells.SetRowHeight(2 + i, 24);            }            sheet.AutoFitColumns();     //设置单元格自适应            workbook.Save(AppDomain.CurrentDomain.BaseDirectory + @"ExportFile\Excel\" + fileName + ".xlsx", SaveFormat.Auto);            return "SUCCESS";        }