EPPLUS：DataValidationリストの長さは255文字を超えることはできません

Question

この質問は、別の投稿の基本レベルに回答しています：here私の場合は、検証値をシートにハードコードできません。セルの内容に基づいてデータベースを作成し、各行で4つの列に対して個別の検証を行う必要があります。これが達成できる方法はありますか？前もって感謝します。

// 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

だからアーニーは、私が何をしたか言ったようにはい（それが動作していることを確認するために、それを再表示する）は、第2のシート「ProductValidations」を追加し、隠しに設定しました。 DataTableからデータを読み込み、基本的なEPPLUS書式を追加します。次に、各セルの「ProductValidations」シートに「行」と「挿入」の値を反復処理します。次に、列番号を正しいExcelの列名（A、AC、BCEなど）に変換します。次に、「ProductValidations」シートの正しい範囲のセルを対象とするExcel式として渡す文字列を作成します。また、サーバーからExcelファイルをダウンロードする際に問題が発生した場合は、このguidメソッドがうまく動作します。

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(); 
       } 
      }