c# applibrary实现一个Sheet表中存放多张DataTable数据

1、工具类（applibrary.dll）

    public class ExcelHelper {
        /// <summary>
        /// 文件名
        /// </summary>
        public string fileName { get; set; }
        /// <summary>
        /// 工作簿列表 
        /// </summary>
        public List<WorkSheet> workSheets { get; set; }
        /// <summary>
        /// Excel文档对象
        /// </summary>
        public XlsDocument doc { get; set; }

        public string message { get; set; }

        public ExcelHelper() {
            doc = new XlsDocument();
            workSheets = new List<WorkSheet>();
        }

        /// <summary>
        /// 导出Excel
        /// </summary>
        /// <returns></returns>
        public bool ToExcel() {
            if (string.IsNullOrEmpty(fileName)) {
                message = "请输入文件名";
                return false;
            }
            if (workSheets.Count == 0) {
                message = "请指定工作簿数据";
                return false;
            }
            doc.FileName = fileName;
            foreach (var workSheet in workSheets) {
                AppLibrary.WriteExcel.Worksheet sheet = null;
                //判断Worksheet是否存在
                try {
                    sheet = doc.Workbook.Worksheets[workSheet.name];
                } catch (Exception ex) {
                    sheet = doc.Workbook.Worksheets.Add(workSheet.name);
                }

                AppLibrary.WriteExcel.Cells cells = sheet.Cells;

                var dt = workSheet.table;
                
                for (int j = 0; j <= dt.Columns.Count - 1; j++) {
                    if (workSheet.xf != null) {
                        cells.Add(workSheet.startX, workSheet.startY + j, dt.Columns[j].ColumnName, workSheet.xf);
                    } else {
                        cells.Add(workSheet.startX, workSheet.startY + j, dt.Columns[j].ColumnName);
                    }
                }
                for (int i = 0; i <= dt.Rows.Count - 1; i++) {
                    for (int j = 0; j <= dt.Columns.Count - 1; j++) {
                        cells.Add(i + 1 + workSheet.startX, j + workSheet.startY, dt.Rows[i][j].ToEString());
                    }
                }
            }
            doc.Send();
            return true;
        }
    }

    public class WorkSheet {
        private int _startX = 1;
        private int _startY = 1;
        public string name { get; set; }
        public DataTable table { get; set; }
        public int startX {
            get {
                return _startX;
            }
            set {
                if (value > 1) {
                    _startX = value;
                }
            }
        }
        public int startY {
            get {
                return _startY;
            }
            set {
                if (value > 1) {
                    _startY = value;
                }
            }
        }
        public AppLibrary.WriteExcel.XF xf { get; set; }
    }

2、调用代码：

　　　　　　  ExcelHelper excel = new ExcelHelper();
            excel.fileName = batchNo + ".xls";

            //汇总
            sql = string.Format(@"SELECT * from SKU WHERE batchNo='{0}'", batchNo);
            ret = dbHelper.Query(sql);
            AppLibrary.WriteExcel.XF xfcolumn = excel.doc.NewXF();
            xfcolumn.Font.Bold = true;
            xfcolumn.Pattern = 1;
            xfcolumn.PatternColor = AppLibrary.WriteExcel.Colors.Cyan;
            excel.workSheets.Add(new WorkSheet() { name = "自动汇总", table = ret.Tables[0], xf = xfcolumn });

3、设置样式和宽度，表头和单元格样式要分开设置，申明两个XF变量。

            #region 设置样式
　　　　　　  //设置单元格样式
            var xf = doc.NewXF();
            xf.UseBorder = true;
            xf.LeftLineStyle = 1;
            xf.RightLineStyle = 1;
            xf.TopLineStyle = 1;
            xf.BottomLineStyle = 1;
            xf.LeftLineColor = AppLibrary.WriteExcel.Colors.Black;
            xf.RightLineColor = AppLibrary.WriteExcel.Colors.Black;
            xf.TopLineColor = AppLibrary.WriteExcel.Colors.Black;
            xf.BottomLineColor = AppLibrary.WriteExcel.Colors.Black;
            xf.UseFont = true;
　　　　　　  //设置表头样式
            var thXf = doc.NewXF();
            thXf.Pattern = 1;
            thXf.PatternColor = AppLibrary.WriteExcel.Colors.Default1B;
            thXf.UseBorder = true;
            thXf.LeftLineStyle = 1;
            thXf.RightLineStyle = 1;
            thXf.TopLineStyle = 1;
            thXf.BottomLineStyle = 1;
            thXf.LeftLineColor = AppLibrary.WriteExcel.Colors.Black;
            thXf.RightLineColor = AppLibrary.WriteExcel.Colors.Black;
            thXf.TopLineColor = AppLibrary.WriteExcel.Colors.Black;
            thXf.BottomLineColor = AppLibrary.WriteExcel.Colors.Black;
            thXf.Font.Bold = true;

            #endregion
            #region 宽度
            AddColumnInfo(doc, sheet, 0, 8, 15);
            AddColumnInfo(doc, sheet, 9, 9, 30);
            AddColumnInfo(doc, sheet, 10, 15, 15);
            #endregion


　　　　　　  private static void AddColumnInfo(AppLibrary.WriteExcel.XlsDocument doc, AppLibrary.WriteExcel.Worksheet sheet, int start, int end, int width) {
            AppLibrary.WriteExcel.ColumnInfo colInfo = new AppLibrary.WriteExcel.ColumnInfo(doc, sheet);
            colInfo.ColumnIndexStart = (ushort)start;
            colInfo.ColumnIndexEnd = (ushort)end;
            colInfo.Width = (ushort)(width * 256);
            sheet.AddColumnInfo(colInfo);
        }

说明：

　　1、一个Sheet表中可以存放多张DataTable数据

　　2、服务端无需安装Excel

　　3、Send方法直接导出到浏览器端，无需先存本地再读取本地文件转换成byte输出