C#导出excel复杂表格(单元各合并)

        /// <summary>
        /// DataTable数据表保存至Excel （合并行报表）【年度日报表】
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="filePath"></param>
        /// <param name="excelParm"></param>
        public static void ToExcel1(DataTable dt, string filePath, ExcelParm excelParm)
        {
            string unitId = Tools.GetAppSetting("UnitId");
            string subTitle = string.Empty;
            if (!string.IsNullOrEmpty(excelParm.GrossWorker))
            {
                subTitle += "二次司磅员：" + excelParm.GrossWorker + " ";
            }
            if (!string.IsNullOrEmpty(excelParm.CustomerName))
            {
                subTitle += "客户名称：" + excelParm.CustomerName + " ";
            }
            if (!string.IsNullOrEmpty(excelParm.MaterialName))
            {
                subTitle += "物料名称：" + excelParm.MaterialName + " ";
            }
            if (!string.IsNullOrEmpty(excelParm.CarNumber))
            {
                subTitle += "车号：" + excelParm.CarNumber + " ";
            }
            if (!string.IsNullOrEmpty(excelParm.ContractCode))
            {
                subTitle += "合同号：" + excelParm.ContractCode + " ";
            }
            if (!string.IsNullOrEmpty(excelParm.Datatime1) && !string.IsNullOrEmpty(excelParm.Datatime2))
            {
                subTitle += "日期：" + excelParm.Datatime1 + " 至 " + excelParm.Datatime2;
            }


            //新建工作簿  
            Workbook wb = new Workbook();
            //新建工作表  
            Worksheet ws = wb.Worksheets[0];

            ws.Name = dt.TableName;

            int rowIndex = 3;
            int colIndex = 0;
            int colCount = dt.Columns.Count;
            int rowCount = dt.Rows.Count;

            ws.Cells.SetRowHeight(rowIndex, 25);//设置行高

            //创建样式
            Style style = wb.Styles[wb.Styles.Add()];//新增样式  
            style.HorizontalAlignment = TextAlignmentType.Center; //单元格内容的水平对齐方式文字居中
            style.Font.Name = "宋体"; //字体
            style.Font.IsBold = true; //设置粗体
            //style.Font.Color = Color.White;//设置字体颜色
            style.Font.Size = 10; //设置字体大小
            //style.ForegroundColor = Color.FromArgb(0, 196, 180); //背景色
            style.Pattern = BackgroundType.Solid;

            style.Borders[BorderType.TopBorder].LineStyle = CellBorderType.Thin;
            style.Borders[BorderType.TopBorder].Color = Color.Black;
            style.Borders[BorderType.BottomBorder].LineStyle = CellBorderType.Thin;
            style.Borders[BorderType.BottomBorder].Color = Color.Black;
            style.Borders[BorderType.LeftBorder].LineStyle = CellBorderType.Thin;
            style.Borders[BorderType.LeftBorder].Color = Color.Black;
            style.Borders[BorderType.RightBorder].LineStyle = CellBorderType.Thin;
            style.Borders[BorderType.RightBorder].Color = Color.Black;


            //列名的处理
            for (int i = 0; i < colCount; i++)
            {
                ws.Cells[rowIndex, colIndex].PutValue(dt.Columns[i].ColumnName);
                ws.Cells[rowIndex, colIndex].SetStyle(style);//给单元格关联样式
                colIndex++;
            }


            Style style2 = wb.Styles[wb.Styles.Add()];//新增样式
            style2.Font.Name = "宋体";//文字字体
            style2.Font.Size = 10;//文字大小 
            style2.ShrinkToFit = true;
            style2.VerticalAlignment = TextAlignmentType.Center;

            style2.Borders[BorderType.TopBorder].LineStyle = CellBorderType.Thin;
            style2.Borders[BorderType.TopBorder].Color = Color.Black;
            style2.Borders[BorderType.BottomBorder].LineStyle = CellBorderType.Thin;
            style2.Borders[BorderType.BottomBorder].Color = Color.Black;
            style2.Borders[BorderType.LeftBorder].LineStyle = CellBorderType.Thin;
            style2.Borders[BorderType.LeftBorder].Color = Color.Black;
            style2.Borders[BorderType.RightBorder].LineStyle = CellBorderType.Thin;
            style2.Borders[BorderType.RightBorder].Color = Color.Black;

            Style style3 = wb.Styles[wb.Styles.Add()];//组织标题样式
            style3.Font.Name = "宋体";//文字字体
            style3.Font.Size = 16;//文字大小 
            style3.HorizontalAlignment = TextAlignmentType.Center;
            ws.Cells.SetRowHeight(0, 25);//设置行高
            ws.Cells.Merge(0, 0, 1, dt.Columns.Count);
            ws.Cells[0, 0].PutValue(excelParm.OrganName);
            ws.Cells[0, 0].SetStyle(style3);

            Style style5 = wb.Styles[wb.Styles.Add()];//标题样式
            style5.Font.Name = "宋体";//文字字体
            style5.Font.IsBold = true; //设置粗体
            style5.Font.Size = 14;//文字大小 
            style5.HorizontalAlignment = TextAlignmentType.Center;
            ws.Cells.SetRowHeight(1, 25);//设置行高
            ws.Cells.Merge(1, 0, 1, dt.Columns.Count);
            ws.Cells[1, 0].PutValue(dt.TableName);
            ws.Cells[1, 0].SetStyle(style5);

            Style style4 = wb.Styles[wb.Styles.Add()];//新增查询条件标题样式
            style4.Font.Name = "宋体";//文字字体
            style4.Font.IsBold = true; //设置粗体
            style4.Font.Size = 10;//文字大小 
            ws.Cells.SetRowHeight(2, 25);//设置行高
            ws.Cells.Merge(2, 0, 1, dt.Columns.Count);
            ws.Cells[2, 0].PutValue(subTitle);
            ws.Cells[2, 0].SetStyle(style4);

            rowIndex++;

            for (int i = 0; i < rowCount; i++)
            {
                ws.Cells.SetRowHeight(rowIndex, 25);//设置行高
                colIndex = 0;
                for (int j = 0; j < colCount; j++)
                {
                    ws.Cells[rowIndex, colIndex].PutValue(dt.Rows[i][j].ToString() == "" ? null : dt.Rows[i][j].ToString());
                    style2.ForegroundColor = Color.White;
                    style2.Pattern = BackgroundType.Solid;
                    ws.Cells[rowIndex, colIndex].SetStyle(style2);//给单元格关联样式
                    colIndex++;
                }
                rowIndex++;
            }

            //设置所有列为自适应列宽 
            ws.AutoFitColumns();

            for (int col = 0; col < colCount; col++)
            {
                ws.Cells.SetColumnWidthPixel(col, ws.Cells.GetColumnWidthPixel(col) + 20);
            }


            #region 合并单元格
            int mergeDateStart = 4;
            int mergeDate = 1;

            int mergeAreaStart = 4;
            int mergeArea = 1;
            for (var i = 0; i < dt.Rows.Count; i++)
            {
                if (i + 1 < dt.Rows.Count)
                {
                    //日期
                    if (dt.Rows[i]["日期"].ToString() != dt.Rows[i + 1]["日期"].ToString())
                    {
                        ws.Cells.Merge(mergeDateStart, 0, mergeDate, 1);
                        mergeDateStart += mergeDate;
                        mergeDate = 1;
                    }
                    else
                    {
                        mergeDate++;
                    }

                    //区域
                    if (dt.Rows[i]["区域"].ToString() != dt.Rows[i + 1]["区域"].ToString())
                    {
                        ws.Cells.Merge(mergeAreaStart, 1, mergeArea, 1);
                        mergeAreaStart += mergeArea;
                        mergeArea = 1;
                    }
                    else
                    {
                        mergeArea++;
                    }
                }
                else
                {
                    //日期
                    ws.Cells.Merge(mergeDateStart, 0, mergeDate, 1);
                    //区域
                    ws.Cells.Merge(mergeAreaStart, 1, mergeArea, 1);
                }
            }
            #endregion


            string fullUpLoadPath = HttpContext.Current.Server.MapPath("~/UpLoad/Excel/");
            //检查本地上传的物理路径是否存在，不存在则创建
            if (!System.IO.Directory.Exists(fullUpLoadPath))
            {
                System.IO.Directory.CreateDirectory(fullUpLoadPath);
            }

            filePath = GetMapPath(filePath);
            if (System.IO.File.Exists(filePath))
                System.IO.File.Delete(filePath);
            System.IO.FileStream fs = System.IO.File.Create(filePath);
            fs.Close();
            wb.Save(filePath);
        }