导出到 Excel (OpenXML) 会导致内容不可读

Question

我一直在为我的 xlsx 文件创建工作表而苦苦挣扎。添加第一个工作表不是问题，但是当我想要第二个工作表时，导出的 xlsx 似乎已损坏。谁能指出我做错了什么？ 注意：我已经尝试调用 'workbookpart,Workbook.Save();'在创建第一个工作簿之后，但没有所需的结果。

protected void export_Click(object sender, EventArgs e)
{
    ExportToExcel(@"D:\dev\Dotnet4\Excel\test.xlsx");
}

private void ExportToExcel(string filepath)
{
    SpreadsheetDocument spreadsheetDocument;
    WorkbookPart workbookpart;
    CreateSpreadsheet(filepath, out spreadsheetDocument, out workbookpart);

    CreateWorksheet(spreadsheetDocument, workbookpart, "My sheet 1");
    CreateWorksheet(spreadsheetDocument, workbookpart, "My sheet 2");

    workbookpart.Workbook.Save();

    // Close the document.
    spreadsheetDocument.Close();
}

private static void CreateWorksheet(SpreadsheetDocument spreadsheetDocument, WorkbookPart workbookpart, string worksheetName)
{
    // Add a WorksheetPart to the WorkbookPart.
    WorksheetPart worksheetPart = workbookpart.AddNewPart<WorksheetPart>();
    worksheetPart.Worksheet = new Worksheet(new SheetData());

    // Add Sheets to the Workbook.
    Sheets sheets = spreadsheetDocument.WorkbookPart.Workbook.
        AppendChild<Sheets>(new Sheets());

    // Append a new worksheet and associate it with the workbook.
    Sheet sheet = new Sheet()
    {
        Id = spreadsheetDocument.WorkbookPart.
            GetIdOfPart(worksheetPart),
        SheetId = 1,
        Name = worksheetName
    };
    sheets.Append(sheet);
}

private static void CreateSpreadsheet(string filepath, out SpreadsheetDocument spreadsheetDocument, out WorkbookPart workbookpart)
{
    // Create a spreadsheet document by supplying the filepath.
    // By default, AutoSave = true, Editable = true, and Type = xlsx.
    spreadsheetDocument = SpreadsheetDocument.
        Create(filepath, SpreadsheetDocumentType.Workbook);

    // Add a WorkbookPart to the document.
    workbookpart = spreadsheetDocument.AddWorkbookPart();
    workbookpart.Workbook = new Workbook();
}

Answer 1

我认为你有两个小问题：

1. SheetId 与您添加的两张工作表相同，这是无效的。
2. 您每次调用CreateWorksheet 时都会添加一个新的Sheets 元素，但XML 中应该只有一个这样的元素（Sheet 有很多但Sheets 不多！）。李>

要解决 1，您可以使用 sheets.ChildElements 的计数。因为这是0 第一次，第二次你需要添加1 到它。如果您愿意，可以将其作为参数传入CreateWorksheet；只要它们从 1 开始并且不同，这并不重要。

要解决 2，您可以对 Workbook 的 Sheets 属性执行空检查，并且仅在它不存在时才创建它。

下面应该做你所追求的。

private static void CreateWorksheet(SpreadsheetDocument spreadsheetDocument, WorkbookPart workbookpart, string worksheetName)
{
    // Add a WorksheetPart to the WorkbookPart.
    WorksheetPart worksheetPart = workbookpart.AddNewPart<WorksheetPart>();
    worksheetPart.Worksheet = new Worksheet(new SheetData());

    // Add Sheets to the Workbook.
    if (spreadsheetDocument.WorkbookPart.Workbook.Sheets == null)
    {
        //spreadsheetDocument.WorkbookPart.Workbook.Sheets = new Sheets();
        spreadsheetDocument.WorkbookPart.Workbook
                                        .AppendChild<Sheets>(new Sheets());
    }

    Sheets sheets = spreadsheetDocument.WorkbookPart.Workbook.Sheets;

    // Append a new worksheet and associate it with the workbook.
    Sheet sheet = new Sheet()
    {
        Id = spreadsheetDocument.WorkbookPart.
            GetIdOfPart(worksheetPart),
        SheetId = (UInt32)sheets.ChildElements.Count + 1,
        Name = worksheetName
    };
    sheets.Append(sheet);
}

最后一点是SpreadsheetDocument 实现了IDisposable，所以它应该在使用后被丢弃。