如何使用 Open XML 将公式插入 Excel 2010 工作表？

Question

我正在使用 Visual Studio 2010 (VB.Net) 和 Open XML SDK 2.0。如何将公式插入 Excel 2010 工作表？当我这样做时，我还希望将单元格的 CellValue 属性设置为 DBNull 或 EmptyString，以强制 Excel 在用户打开工作簿时重新计算单元格。

Answer 1

只需将 CellValue 保留为 null，然后实例化一个新的 CellFormula，如下所示：

Cell cell = new Cell()
{
  CellReference = "A3",
  DataType = new EnumValue<CellValues>(CellValues.Number),
  CellFormula = "SUM(A1:A2)"
};

在 Excel 中打开文档时将计算单元格值

Answer 2

这来自附加到 Open XML SDK 2.0 for Microsoft Office 帮助文件的帮助文档，并进行了一些修改以添加公式。

Main() 查找包含一张纸的空白 Excel 文档，并将 SUM() 公式添加到单元格 A3 中。

Sub Main()
    Dim outputFilePath = "C:\Book1.xlsx"
    Dim doc As SpreadsheetDocument = SpreadsheetDocument.Open(outputFilePath, True)
    Dim workbookPart As WorkbookPart = doc.WorkbookPart
    Dim worksheetPart As WorksheetPart = workbookPart.WorksheetParts.First()

    InsertCellInWorksheet("A", 3, worksheetPart)
End Sub

' Given a column name, a row index, and a WorksheetPart, inserts a cell into the worksheet. 
' If the cell already exists, return it. 
Private Function InsertCellInWorksheet(ByVal columnName As String, ByVal rowIndex As     UInteger, ByVal worksheetPart As WorksheetPart) As Cell
    Dim worksheet As Worksheet = worksheetPart.Worksheet
    Dim sheetData As SheetData = worksheet.GetFirstChild(Of SheetData)()
    Dim cellReference As String = (columnName + rowIndex.ToString())

    ' If the worksheet does not contain a row with the specified row index, insert one.
    Dim row As Row
    If (sheetData.Elements(Of Row).Where(Function(r) r.RowIndex.Value = rowIndex).Count() <> 0) Then
        row = sheetData.Elements(Of Row).Where(Function(r) r.RowIndex.Value = rowIndex).First()
    Else
        row = New Row()
        row.RowIndex = rowIndex
        sheetData.Append(row)
    End If

    ' If there is not a cell with the specified column name, insert one.  
    If (row.Elements(Of Cell).Where(Function(c) c.CellReference.Value = columnName + rowIndex.ToString()).Count() > 0) Then
        Return row.Elements(Of Cell).Where(Function(c) c.CellReference.Value = cellReference).First()
    Else
        ' Cells must be in sequential order according to CellReference. Determine where to insert the new cell.
        Dim refCell As Cell = Nothing
        For Each cell As Cell In row.Elements(Of Cell)()
            If (String.Compare(cell.CellReference.Value, cellReference, True) > 0) Then
                refCell = cell
                Exit For
            End If
        Next

        Dim newCell As Cell = New Cell
        newCell.CellReference = cellReference
        newCell.CellFormula = New CellFormula("SUM(A1:A2)")

        row.InsertBefore(newCell, refCell)
        worksheet.Save()

        Return newCell
    End If
    End Function

请注意，此方法假设您在公式中引用的每个单元格都有正确标记的引用。

Answer 3

您可以在模板excel中设置公式并编写以下代码来重新计算它们：

spreadSheet.WorkbookPart.Workbook.CalculationProperties.ForceFullCalculation = True spreadSheet.WorkbookPart.Workbook.CalculationProperties.FullCalculationOnLoad = True