導出到Excel（OpenXML）導致無法讀取的內容

Question

我一直在爲我的xlsx文件創建工作表。添加第一張工作表不是問題，但是當我想要第二張工作表時，導出的xlsx似乎已損壞。誰能指出我做錯了什麼？ 注意：我已經嘗試調用'workbookpart，Workbook.Save（）;'創建第一個工作簿後，但沒有所需的結果。

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

我認爲你有兩個小問題：

1. 的SheetId是要添加哪些是無效的兩片相同的。
2. 您每次呼叫CreateWorksheet時都會添加一個新的Sheets元素，但XML中只能有一個這樣的元素（有許多Sheet，但不是很多Sheets！）。

要解決1您可以使用sheets.ChildElements的計數。由於這是0第一次和第二次，你需要添加1它。如果你喜歡，你可以把它作爲參數CreateWorksheet;只要他們從1開始並且不同，它並不重要。

要解決2，您可以對Workbook的Sheets屬性執行空檢查，並且只有在它不存在時纔會創建該屬性。

下面應該做你以後的事情。

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); 
} 

最後一點是，SpreadsheetDocument器具IDisposable所以應該使用後廢棄。