C# Excel 互操作 : Excel process remains in memory until parent form closed

Question

在我的表单中，我正在做一些简单的事情

private void btnPrintPickList_Click(object sender, EventArgs e)
{
    using (var salesRpt = new SalesOrder(CurrentItem()))
    {
        salesRpt.CreateSpreadSheet();
        salesRpt.Dispose();
    }
}

我遵循了“excel interop 无 2 点规则”。

protected ExcelSheet(bool documentVisible, XlPageOrientation orientation)
{
    ExcelApplication = new Application {Visible = documentVisible};
    WorkBooks = ExcelApplication.Workbooks;
    WorkBook = WorkBooks.Add(XlSheetType.xlWorksheet);
    SheetList = WorkBook.Worksheets;
    Orientation = orientation;
    WorkSheet = (Worksheet) ExcelApplication.ActiveSheet;
}

public Application ExcelApplication { get; private set; }
public Workbook WorkBook { get; private set; }
public Workbooks WorkBooks { get; private set; }
public Worksheet WorkSheet { get; private set; }
public Sheets SheetList { get; private set; }
public XlPageOrientation Orientation { get; private set; }

dispose 方法执行以下操作。

    public void Dispose()
    {
        for (int i = 1; i <= SheetList.Count; i++)
        {
            Marshal.FinalReleaseComObject(SheetList[i]);
        }
        //Marshal.FinalReleaseComObject(WorkSheet);
        Marshal.FinalReleaseComObject(SheetList);
        Marshal.FinalReleaseComObject(WorkBook);
        WorkBooks.Close();
        Marshal.FinalReleaseComObject(WorkBooks);
        ExcelApplication.Quit();
        Marshal.FinalReleaseComObject(ExcelApplication);
        WorkSheet = null;
        SheetList = null;
        WorkBook = null;
        WorkBooks = null;
        ExcelApplication = null; 
    }

在我的测试中，打印 Excel 电子表格后，EXCEL.exe 进程并没有一直从任务栏的当前进程中删除。

我做错了什么？

Answer 1

您是否尝试调用 GC.Collect()？

或者，如果您不想强制立即对所有代进行垃圾回收，您可以使用using{}