EPPLUS：DataValidation 列表的长度不能超过 255 个字符

Question

这个问题在另一个 post 上得到了基本的回答：但是对于我的情况，我无法将验证值硬编码到我正在提取的 sheet 中它们基于单元格的内容从数据库中提取，并且需要对每一行的 4 列进行单独的验证。有什么办法可以实现吗？提前谢谢你。

    // Data Validations //
            // Product Validation // 
            for (int i = 2; i < rowCount; i++)
            {
                var val = ws.DataValidations.AddListValidation(ws.Cells[i, 5].Address);
                val.ShowErrorMessage = true;
                val.ErrorTitle = "Entry was invalid.";
                val.Error = "Please choose options from the drop down only.";

                var ticketEntity = ticketQueryable.Where(o => o.TTSTicketNumber == ws.Cells[i, 3].Value.ToString()).Single<CustCurrentTicketEntity>();

                var prodIds = prodExtQueryable.Where(p => p.ZoneId == ticketEntity.ZoneId && p.TicketTypeId == ticketEntity.TicketTypeId);

                if (ticketEntity != null)
                {
                    var prodIdsList = new List<int>();
                    foreach (var prodId in prodIds)
                    {
                        prodIdsList.Add(prodId.ProductId);
                    }
                    var ProductList = ProductCache.Instance.AllProducts.Where(p => prodIdsList.Contains(p.ProductId)).Select(p => new SelectListItem() { Value = p.ProductId.ToString(), Text = p.Name });

                    foreach (var Result in ProductList)
                    {
                        var product = Result.Text;
                        val.Formula.Values.Add(product);
                    }
                }
            }

Answer 1

所以是的，正如厄尼所说我所做的是添加第二个 sheet "ProductValidations" 并将其设置为隐藏（取消隐藏以检查它是否正常工作）。然后我从 DataTable 加载我的数据，然后添加一些基本的 EPPLUS 格式。然后，我遍历行并将值插入到每个单元格的 "ProductValidations" sheet 中。接下来，我将我的列号转换为正确的 Excel 列字母名称（A、AC、BCE 等），然后我创建一个字符串作为 Excel 公式传回，目标是 Excel 中正确的单元格范围=13=] sheet。对于从服务器下载 Excel 文件时遇到问题的任何人，此 guid 方法对我来说都很好用。

    public ActionResult DownloadExcel(EntityReportModel erModel, string filename)
    {
        var dataResponse = iEntityViewService.LoadEntityView(new EntityViewInput
        {
            SecurityContext = SessionCache.Instance.SecurityContext,
            EntityViewName = "Ticket",
            Parameters = new Dictionary<string, object> {
                {"MinTicketDateTime", "04/26/16"}
            }
        });

        var table = dataResponse.DataSet.Tables[0];
        filename = "TICKETS-" + DateTime.Now.ToString("yyyy-MM-dd--hh-mm-ss") + ".xlsx";

        using (ExcelPackage pack = new ExcelPackage())
        {
            ExcelWorksheet ws = pack.Workbook.Worksheets.Add(filename);
            //Add second sheet to put Validations into
            ExcelWorksheet productVal = pack.Workbook.Worksheets.Add("ProductValidations");
            // Hide Validation Sheet
            productVal.Hidden = OfficeOpenXml.eWorkSheetHidden.Hidden;
            // Load the data from the datatable 
            ws.Cells["A1"].LoadFromDataTable(table, true);
            ws.Cells[ws.Dimension.Address].AutoFitColumns();

            int columnCount = table.Columns.Count;
            int rowCount = table.Rows.Count;

            // Format Worksheet// 
            ws.Row(1).Style.Font.Bold = true;

            List<string> deleteColumns = new List<string>() {
                "CurrentTicketId",
                };
            List<string> dateColumns = new List<string>() {
                "TicketDateTime",
                "Updated",
                "InvoiceDate"
                };

            ExcelRange r;

            // Format Dates
            for (int i = 1; i <= columnCount; i++)
            {
                // if cell header value matches a date column
                if (dateColumns.Contains(ws.Cells[1, i].Value.ToString()))
                {
                    r = ws.Cells[2, i, rowCount + 1, i];
                    r.AutoFitColumns();
                    r.Style.Numberformat.Format = @"mm/dd/yyyy hh:mm";
                }
            }
              // Delete Columns
            for (int i = 1; i <= columnCount; i++)
            {
                // if cell header value matches a delete column
                if ((ws.Cells[1, i].Value != null) && deleteColumns.Contains(ws.Cells[1, i].Value.ToString()))
                {
                    ws.DeleteColumn(i);
                }
            }

            int col = 0;
            int Prow = 0;
            int valRow = 1;
            // Data Validations //
            // Iterate over the Rows and insert Validations
            for (int i = 2; i-2 < rowCount; i++)
            {
                Prow = 0;
                col++;
                valRow++;
                // Add Validations At this row in column 7 //
                var ProdVal = ws.DataValidations.AddListValidation(ws.Cells[valRow, 7].Address);

                ProdVal.ShowErrorMessage = true;
                ProdVal.ErrorTitle = "Entry was invalid.";
                ProdVal.Error = "Please choose options from the drop down only.";
                var ticketEntity = ticketQueryable.Where(o => o.TTSTicketNumber == ws.Cells[i, 3].Value.ToString()).Single<CustCurrentTicketEntity>();
                // Product Validation // 
                var prodIds = prodExtQueryable.Where(p => p.ZoneId == ticketEntity.ZoneId && p.TicketTypeId == ticketEntity.TicketTypeId);

                if (ticketEntity != null)
                {
                    var prodIdsList = new List<int>();
                    foreach (var prodId in prodIds)
                    {
                        prodIdsList.Add(prodId.ProductId);
                    }
                    var ProductList = ProductCache.Instance.AllProducts.Where(p => prodIdsList.Contains(p.ProductId)).Select(p => new SelectListItem() { Value = p.ProductId.ToString(), Text = p.Name });
                    //For Each Item in the list move the row forward and add that value to the Validation Sheet
                    foreach (var Result in ProductList)
                    {
                        Prow++;
                        var product = Result.Text;
                            productVal.Cells[Prow, col].Value = product;
                    }

                    // convert column name from a number to the Excel Letters i.e A, AC, BCE//
                    int dividend = col;
                    string columnName = String.Empty;
                    int modulo;

                    while (dividend > 0)
                    {
                        modulo = (dividend - 1) % 26;
                        columnName = Convert.ToChar(65 + modulo).ToString() + columnName;
                        dividend = (int)((dividend - modulo) / 26);
                    }

                    // Pass back to sheeet as an Excel Formula to get around the 255 Char limit for Validations// 
                    string productValidationExcelFormula = "ProductValidations!" + columnName + "1:" + columnName + Prow;
                    ProdVal.Formula.ExcelFormula = productValidationExcelFormula;
                }
            }

            // Save File //
            var fileStream = new MemoryStream(pack.GetAsByteArray());
            string handle = Guid.NewGuid().ToString();
            fileStream.Position = 0;
            TempData[handle] = fileStream.ToArray();
            // Note we are returning a filename as well as the handle
            return new JsonResult()
            {
                Data = new { FileGuid = handle, FileName = filename }
            };
        }
    }
    [HttpGet]
            public virtual ActionResult Download(string fileGuid, string fileName)
            {
                if (TempData[fileGuid] != null)
                {
                    byte[] data = TempData[fileGuid] as byte[];
                    return File(data, "application/vnd.ms-excel", fileName);
                }
                else
                {
                //Log err
                    return new EmptyResult();
                }
            }

EPPLUS：DataValidation 列表的长度不能超过 255 个字符

EPPLUS: Length of a DataValidation list cannot exceed 255 characters

c#

excel

epplus