打开xml sdk excel公式重新计算缓存问题

Question

我已经查看了所有以前对SO中类似问题的回答，但这些回答不起作用。我在excel中传递值，并希望公式单元格重新计算，但仍显示旧值。

我已经使用了2种技术1）从单元格中删除计算值2）以编程方式打开和关闭文件。他们两个都不适合我。这是我的代码。请帮忙。

  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

从你提供的代码片段中，我想念你引用的博客的重要部分。

正如该博客所述，OpenXML只能用于创建/读取/更新和删除OpenXML兼容应用程序的存储格式。你没有得到实际的应用程序引擎。为了达到你想要的目的，你需要在你的服务器上安装Excel，这样你就可以利用Microsoft.Office.Interop.Excel namespace和它的Application COM接口，或者依赖最终用户的Excel应用程序在打开更新的Excel表格时进行重新计算。

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(); 

请一定要明白，如果你需要这个（因为你需要在一个网页中的计算结果为例）的服务器上运行，你可能会遇到严重的性能问题，内存，I/O和CPU。在这种情况下，我宁愿在C＃中实现计算规则/公式。