打開xml sdk excel公式重新計算緩存問題

Question

我已經查看了所有以前對SO中類似問題的回答，但這些回答不起作用。我在excel中傳遞值，並希望公式單元格重新計算，但仍顯示舊值。

我已經使用了2種技術1）從單元格中刪除計算值2）以編程方式打開和關閉文件。他們兩個都不適合我。這是我的代碼。請幫忙。

  string filename = Server.MapPath("/") + "ExcelData.xlsx"; 



      // getting 2 numbers in excel sheet, saving, and closing it. 

      using (SpreadsheetDocument document = SpreadsheetDocument.Open(filename, true)) 
      { 
       Sheet sheet = document.WorkbookPart.Workbook.Descendants<Sheet>().SingleOrDefault(s => s.Name == "myRange1"); 
       if (sheet == null) 
       { 
        throw new ArgumentException(
         String.Format("No sheet named {0} found in spreadsheet {1}", "myRange1", filename), "sheetName"); 
       } 
       WorksheetPart worksheetPart = (WorksheetPart)document.WorkbookPart.GetPartById(sheet.Id); 

       int rowIndex = int.Parse("C3".Substring(1)); 

       Row row = worksheetPart.Worksheet.GetFirstChild<SheetData>(). 
         Elements<Row>().FirstOrDefault(r => r.RowIndex == rowIndex); 

       Cell cell3 = row.Elements<Cell>().FirstOrDefault(c => "C3".Equals(c.CellReference.Value)); 
       if (cell3 != null) 
       { 
        cell3.CellValue = new CellValue("13"); 
        cell3.DataType = new DocumentFormat.OpenXml.EnumValue<CellValues>(CellValues.Number); 
       } 

       document.WorkbookPart.WorksheetParts 
    .SelectMany(part => part.Worksheet.Elements<SheetData>()) 
    .SelectMany(data => data.Elements<Row>()) 
    .SelectMany(row1 => row1.Elements<Cell>()) 
    .Where(cell => cell.CellFormula != null && cell.CellValue != null) 
    .ToList() 
    .ForEach(cell => cell.CellValue.Remove()); 

       worksheetPart.Worksheet.Save(); 

      } 



      // getting the result out of excel. 
      using (SpreadsheetDocument document = SpreadsheetDocument.Open(filename, false)) 
      { 
       document.WorkbookPart.Workbook.CalculationProperties.ForceFullCalculation = true; 
       document.WorkbookPart.Workbook.CalculationProperties.FullCalculationOnLoad = true; 

       Sheet sheet = document.WorkbookPart.Workbook.Descendants<Sheet>().SingleOrDefault(s => s.Name == "myRange1"); 
       if (sheet == null) 
       { 
        throw new ArgumentException(
         String.Format("No sheet named {0} found in spreadsheet {1}", "myRange1", filename), "sheetName"); 
       } 



       WorksheetPart worksheetPart = (WorksheetPart)document.WorkbookPart.GetPartById(sheet.Id); 

       int rowIndex = int.Parse("C4".Substring(1)); 

       Row row = worksheetPart.Worksheet.GetFirstChild<SheetData>(). 
         Elements<Row>().FirstOrDefault(r => r.RowIndex == rowIndex); 

       Cell cell = row.Elements<Cell>().FirstOrDefault(c => "C4".Equals(c.CellReference.Value)); 

       calculatedvalue = Convert.ToDouble(cell.CellValue.InnerText); 
      } 

Answer 1

從你提供的代碼片段中，我想念你引用的博客的重要部分。

正如該博客所述，OpenXML只能用於創建/讀取/更新和刪除OpenXML兼容應用程序的存儲格式。你沒有得到實際的應用程序引擎。爲了達到你想要的目的，你需要在你的服務器上安裝Excel，這樣你就可以利用Microsoft.Office.Interop.Excel namespace和它的Application COM接口，或者依賴最終用戶的Excel應用程序在打開更新的Excel表格時進行重新計算。

code copied and text adapted from this blog

var excelApp = new Microsoft.Office.Interop.Excel.Application(); 
Workbook workbook = excelApp.Workbooks.Open(Path.GetFullPath(_filePath)); 
workbook.Close(true); 
excelApp.Quit(); 

請一定要明白，如果你需要這個（因爲你需要在一個網頁中的計算結果爲例）的服務器上運行，你可能會遇到嚴重的性能問題，內存，I/O和CPU。在這種情況下，我寧願在C＃中實現計算規則/公式。