c# - 使用 Microsoft.Office.Interop.Excel 导出时我是否正确关闭了 excel 文件

Question

我正在使用以下 example将数据导出到 Excel。

我已经修改了这段代码，以便我可以将其导出并保存到 Excel 文件，但我不确定我是否正确关闭了 excel 文件，我的第二个问题是如果我这样做，是否需要处理任何垃圾收集等。,如果我没有正确或有更好的方法，请告知。

  static void DisplayInExcel(DataSet ds)
    {
        var excelApp = new Excel.Application();
        // Make the object visible.
        excelApp.Visible = true;

        // Create a new, empty workbook and add it to the collection returned  
        // by property Workbooks. The new workbook becomes the active workbook. 
        // Add has an optional parameter for specifying a praticular template.  
        // Because no argument is sent in this example, Add creates a new workbook. 
        excelApp.Workbooks.Add();

        // This example uses a single workSheet. 
       // Excel._Worksheet workSheet = excelApp.ActiveSheet;

        // Earlier versions of C# require explicit casting. 
        Excel._Worksheet workSheet = (Excel.Worksheet)excelApp.ActiveSheet; 

        // Establish column headings in cells A1 and B1.
        workSheet.Cells[1, "B"] = "Date";
        workSheet.Cells[1, "C"] = "Title";
        workSheet.Cells[1, "D"] = "Details";

        DataTable dt = ds.Tables[0];
        var rowIndex = 2; // 1 = header row
        foreach (DataRow row in dt.Rows)
        {
           // rowCount++;
            workSheet.Cells[rowIndex, "B"] = row["Date"];
            workSheet.Cells[rowIndex, "C"] = row["Title"];
            workSheet.Cells[rowIndex, "D"] = row["Description"];
            rowIndex++;
        }


        workSheet.Range["A1", "D" + rowIndex + ""].AutoFormat(Excel.XlRangeAutoFormat.xlRangeAutoFormatColor2);

        //Coloumn 1
        workSheet.Range["A:A"].Cells.Font.Bold = true;
        workSheet.Range["A:A"].ColumnWidth = 10;
        workSheet.Range["A:A"].HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter;
        //Column 2
        workSheet.Range["B:B"].ColumnWidth = 14;
        workSheet.Range["B:B"].HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter;
        //workSheet.Range["A1", "A" + rowIndex + ""].Cells.Font.Bold = true;


        ((Excel.Range)workSheet.Columns[3]).AutoFit();
        ((Excel.Range)workSheet.Columns[4]).AutoFit();

        string fileName = "Product_Excel.xls";
        excelApp.DisplayAlerts = false;
        workSheet.SaveAs(HttpContext.Current.Server.MapPath("../"+fileName));


        GC.Collect();
        GC.WaitForPendingFinalizers();
        excelApp.Quit();

    }

Answer 1

这是我的结束语。

确保在捕捉到所有异常后调用它:

try
{
  //Use spreadsheet here.
  DisplayInExcel(ds)
}
catch
{
  //Process errors
}
Close();

这是结束代码:

public void Close()
{
    try
    {
        if (_workBook == null)
        {
            return;
        }
        _workBook.Save();
        _workBook.Close(false, FILENAME, null);
        Marshal.ReleaseComObject(_workBook);
        _excel.Quit();
        Marshal.ReleaseComObject(_excel);
        _workBook = null;
        _excel = null;
        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();
        GC.WaitForPendingFinalizers();
        Logger("All done!");
    }
    catch (Exception e)
    {
        Logger("Error in cleanup: " + e.ToString());
    }
}