openxml 更新同一行中的 2 个单元格引发异常

Question

在我的模板中，我喜欢更新同一行中的 2 个单元格。第一个单元格是 A53，第二个单元格是 C53。

例外是这个"Object reference not set to an instance of an object"

我在调用方法"InsertCellInWorksheet"的过程中调用方法"UpdateCell"发生错误。

错误发生在下一行，但仅在调用第二个 UpdateCell 方法之后且仅当它们在同一行时发生

if (row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).Count() > 0)

我不得不提一下，在 FooterText5[0].CellText 数组中是一个电子邮件地址，其中有一个 @。

这是我开始整个事情的地方

ExcelCreator.UpdateCell(ms, FooterText3[0].CellText, FooterText3[0].RowIndex, "A");
ExcelCreator.UpdateCell(ms, FooterText5[0].CellText, FooterText5[0].RowIndex, "C");

我的 "UpdateCell" 方法代码：

public static void UpdateCell(Stream template, string cellText, uint rowIndex, string columnName, bool bold = false, int rowHeight = 0)
    {
        // Memorystream of the Template
        using (SpreadsheetDocument spreadSheet = SpreadsheetDocument.Open(template, true))
        {
            // get the first worksheet
            WorksheetPart worksheetPart = spreadSheet.WorkbookPart.WorksheetParts.
            Cell cell = InsertCellInWorksheet(columnName, rowIndex, worksheetPart);
// some other unrelated code

和"InsertCellInWorksheet"方法

    public static Cell InsertCellInWorksheet(string columnName, uint rowIndex, WorksheetPart worksheetPart)
        {
            Worksheet worksheet = worksheetPart.Worksheet;
            SheetData sheetData = worksheet.GetFirstChild<SheetData>();
            string cellReference = columnName + rowIndex;


            Row row;
            if (sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).Count() != 0)
            {
                row = sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).First();
            }
            else
            {
                row = new Row() { RowIndex = rowIndex };
                sheetData.Append(row);
            }
if (row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).Count() > 0)
                {
                    return row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).First();
                }
                else
                {
                    // Cells must be in sequential order according to CellReference. Determine where to insert the new cell.
                    Cell refCell = null;
                    foreach (Cell cell in row.Elements<Cell>())
                    {
                        if (string.Compare(cell.CellReference.Value, cellReference, true) > 0)
                        {
                            refCell = cell;
                            break;
                        }
                    }

                    Cell newCell = new Cell() { CellReference = cellReference };
                    row.InsertBefore(newCell, refCell);

                    worksheet.Save();
                    return newCell;
                }

我的问题是代码哪里有异常？

Answer 1

我想通了。

我改变了这一行

if (row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).Count() > 0)
            {
                return row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).First();
            }

至此

if (row.Elements<Cell>().Where(c => c.CellReference != null && c.CellReference.Value == cellReference).Count() > 0)
            {
                return row.Elements<Cell>().Where(c => c.CellReference != null && c.CellReference.Value == cellReference).Single();
            }

openxml 更新同一行中的 2 个单元格引发异常

openxml update 2 cells in same row throws an exception

c#

openxml