利用Epplus将数据导出到Excel

        /// 

        /// 导出到Excel
        /// 
        /// 
        /// 

        /// 导出Excel
        /// 
        /// 
        private void ExportToExcelCommandAction(object obj)
        {
            string CurrentDateSting = _SelectDate.ToString("yyyyMMdd");
            if (RaceCollect.Count == 0)
            {
                MessageBox.Show("没有可导出的数据！", "警告提示.", MessageBoxButton.OK, MessageBoxImage.Error);
                return;
            }

            //  CommandParameter="{Binding ElementName=RaceGrid}"
            DataGrid grd = obj as DataGrid;

            ExcelPackage ep = new ExcelPackage();
            OfficeOpenXml.ExcelWorkbook workbook = ep.Workbook;
            OfficeOpenXml.ExcelWorksheet sheet = workbook.Worksheets.Add("数据表");

            #region 配置文件属性
            workbook.Properties.Category = "类别";
            workbook.Properties.Author = "作者";
            workbook.Properties.Comments = "备注";
            workbook.Properties.Company = "公司";
            workbook.Properties.Keywords = "关键字";
            workbook.Properties.Manager = "管理者";
            workbook.Properties.Status = "内容状态";
            workbook.Properties.Subject = "主题";
            workbook.Properties.Title = "标题";
            workbook.Properties.LastModifiedBy = "最后一次保存者";
            #endregion

            #region 表头
            int count = 0;
            foreach (var c in grd.Columns)
            {
                count++;
                sheet.Cells[1, count].Value = c.Header;
                sheet.Column(count).Width = c.Width.Value / 5;

                sheet.Cells[1, count].Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;//垂直居中
                sheet.Cells[1, count].Style.VerticalAlignment = ExcelVerticalAlignment.Center; //上下居中
            }
            #endregion

            //// Example how to Format Column 1 as numeric
            //using (ExcelRange col = sheet.Cells[2, 6, 1 + _RaceCollect.Count, grd.Columns.Count])
            //{
            //      col.Style.Numberformat.Format = "##0.00";  //"#,##0.00";
            //    //col.Style.HorizontalAlignment = ExcelHorizontalAlignment.Right;
            //}


            //写数据，即写数据集合
            int rowIndex = 1;
            foreach (Race race in _RaceCollect)
            {
                if (race.QH.ToString().StartsWith(CurrentDateSting))//如果期号以今天开头。则输出Excel
                {
                    rowIndex++;
                    sheet.Cells[rowIndex, 1].Value = race.QH;

                    sheet.Cells[rowIndex, 2].Value = race.D1; SetCellColor(sheet, rowIndex, race, "C1");
                    sheet.Cells[rowIndex, 3].Value = race.D2; SetCellColor(sheet, rowIndex, race, "C2");
                    sheet.Cells[rowIndex, 4].Value = race.D3; SetCellColor(sheet, rowIndex, race, "C3");
                    sheet.Cells[rowIndex, 5].Value = race.D4; SetCellColor(sheet, rowIndex, race, "C4");
                    sheet.Cells[rowIndex, 6].Value = race.D5; SetCellColor(sheet, rowIndex, race, "C5");
                    sheet.Cells[rowIndex, 7].Value = race.D6; SetCellColor(sheet, rowIndex, race, "C6");
                    sheet.Cells[rowIndex, 8].Value = race.D7; SetCellColor(sheet, rowIndex, race, "C7");
                    sheet.Cells[rowIndex, 9].Value = race.D8; SetCellColor(sheet, rowIndex, race, "C8");
                    sheet.Cells[rowIndex, 10].Value = race.D9; SetCellColor(sheet, rowIndex, race, "C9");
                    sheet.Cells[rowIndex, 11].Value = race.D10; SetCellColor(sheet, rowIndex, race, "C10");

                    sheet.Cells[rowIndex, 12].Value = race.DCount;
                    sheet.Cells[rowIndex, 13].Value = race.Colordiff;
                    sheet.Cells[rowIndex, 14].Value = race.ColordiffTotal; 

                    sheet.Cells[rowIndex, 15].Value = race.QH;
                    sheet.Cells[rowIndex, 16].Value = race.P1;
                    sheet.Cells[rowIndex, 17].Value = race.P2;
                    sheet.Cells[rowIndex, 18].Value = race.P3;
                    sheet.Cells[rowIndex, 19].Value = race.P4;
                    sheet.Cells[rowIndex, 20].Value = race.P5;
                    sheet.Cells[rowIndex, 21].Value = race.P6;
                    sheet.Cells[rowIndex, 22].Value = race.P7;
                    sheet.Cells[rowIndex, 23].Value = race.P8;
                    sheet.Cells[rowIndex, 24].Value = race.P9;
                    sheet.Cells[rowIndex, 25].Value = race.P10;
                }
                sheet.Cells[rowIndex + 1, 1].Value = "颜色小计";

                //利用反射读取类属性的值
                var typeRaceTj = typeof(RaceTj);
                for (int i = 1; i <= 10; i++)
                {
                    var n = (int)typeRaceTj.GetProperty($"T{i}").GetValue(_Tj);
                    sheet.Cells[rowIndex + 1, i+1].Value = n;
                }

                sheet.Row(rowIndex + 1).Height = 30;
                sheet.Row(1).Height = 30;
            }


            var border = sheet.Cells[1, 1, rowIndex+1, 25].Style.Border;

            border.Bottom.Style = border.Top.Style = border.Left.Style = border.Right.Style = ExcelBorderStyle.Thin;
            sheet.Cells.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
            sheet.Cells.Style.VerticalAlignment = ExcelVerticalAlignment.Center;

            sheet.Cells.Style.WrapText = true;

            if (rowIndex == 1)
            {
                MessageBox.Show("没有选中日期的数据可导出Excel(可能只有前1日数据存在)！", "警告提示.", MessageBoxButton.OK, MessageBoxImage.Error);
                return;
            }

            Microsoft.Win32.SaveFileDialog sfd = new Microsoft.Win32.SaveFileDialog();
            sfd.Filter = "Excel(*.xlsx)|*.xlsx";
            sfd.Title = "保存文件路径及名称";
            if (sfd.ShowDialog() == true)
            {
                FileInfo file = new FileInfo(sfd.FileName);
                ep.File = file;
                ep.Save();
                MessageBox.Show("选中日期数据已经成功保存至Excel！", "保存Excel提示.", MessageBoxButton.OK, MessageBoxImage.Information);
            }
            else
            {
                MessageBox.Show("保存操作被取消");
            }
        }

        /// 

        /// 设置单元格背景色为红色
        /// 
        /// 
        /// 
        /// 
        /// 
        private static void SetCellColor(ExcelWorksheet sheet, int rowIndex, Race race, string colorFieldName)
        {
            //反射类属性值
            PropertyInfo p = typeof(Race).GetProperty(colorFieldName);
            int col = 0;
            if ((int)p.GetValue(race) == 1)
            {
                col = int.Parse(colorFieldName.Substring(1, colorFieldName.Length - 1)) + 1;

                sheet.Cells[rowIndex, col].Style.Fill.PatternType = ExcelFillStyle.Solid;//将背景图案设置为实体
                sheet.Cells[rowIndex, col].Style.Fill.BackgroundColor.SetColor(System.Drawing.Color.IndianRed);
            }
        }