C# Excel DNA加载项在以下情况下卸载；是否要保存“提示”；选择“取消”按钮

当我按File->Exit（或Alt+F4）或X时，我会收到“是否保存更改”对话框的提示，在该对话框中我可以选择“取消”。因此Excel可以继续，但我的Excel dna外接程序再也不会收到通知，并保持卸载状态

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提前谢谢各位

据我所知，在用户单击“取消”之前执行WorkbookBeforeClose时会出现问题。还有一些选择

简单的方法是，您可以在WorkbookBeforeClose事件中保存活动的woorkbook（woorkbook对象具有save和saveas方法）。由于工作簿已保存，因此不会显示“保存”对话框，用户也不会单击“取消”按钮

另一种解决方案是在WorkbookBeforeClose中调用自定义保存对话框。我在其他项目中使用了以下代码。关闭前的工作簿可能如下所示：

  private void ActiveWorkbook_BeforeClose(ref bool Cancel)
    {
        DefaultSaveExcel(Excel.ActiveWorkbook,ref Cancel);

        if (!Cancel)
        {
            //if enters here is because the workbook is actually closing
            Delete(Excel.ActiveWorkbook.Name);
        }                     
    }

 public  void DefaultSaveExcel(Workbook wb, ref bool Cancel)
    {
        while (wb.Saved == false && Cancel == false)
        {
            var result = ShowMessageDialogSave();

            if (result == System.Windows.Forms.DialogResult.Yes)
            {
                var sa = CreateExcelSaveDialog(wb.FullName);

                if (sa.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    wb.SaveAs(sa.FileName);
                    wb.Save();

                }
            }
            else if (result == System.Windows.Forms.DialogResult.No)
            {
                wb.Saved = true;
            }
            else if (result == System.Windows.Forms.DialogResult.Cancel)
            {
                Cancel = true;
            }
        }
    }

    public  System.Windows.Forms.SaveFileDialog CreateExcelSaveDialog(string name = null)
    {
        var sa = new System.Windows.Forms.SaveFileDialog();
        sa.Filter = "Excel files (*.xlsx)|*.xlsx";
        if (!string.IsNullOrEmpty(name))
            sa.FileName = name;
        sa.CreatePrompt = true;

        return sa;
    }

    public  DialogResult ShowMessageDialogSave()
    {
        var app = (Microsoft.Office.Interop.Excel.Application)ExcelDna.Integration.ExcelDnaUtil.Application;
        NativeWindow xlMain = new NativeWindow();
        xlMain.AssignHandle(new IntPtr(app.Hwnd));

        var message = "Do you want to save pending changes?";

        if (Thread.CurrentThread.CurrentCulture.TwoLetterISOLanguageName.ToLower() == "es")
            message = "¿Desea guardar los cambios pendientes?";


        return System.Windows.Forms.MessageBox.Show(xlMain, message, "Microsoft Excel", System.Windows.Forms.MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning,MessageBoxDefaultButton.Button1);
    }

public override void OnBeginShutdown(ref Array custom)
{
    base.OnBeginShutdown(ref custom);

    //I PUT MY CUSTOM CODE HERE:
    CloseAllPanes();

    ExcelTaskExecutor.Destroy();
}

实际的DefaultSaveExcel实现可能如下所示：

  private void ActiveWorkbook_BeforeClose(ref bool Cancel)
    {
        DefaultSaveExcel(Excel.ActiveWorkbook,ref Cancel);

        if (!Cancel)
        {
            //if enters here is because the workbook is actually closing
            Delete(Excel.ActiveWorkbook.Name);
        }                     
    }

 public  void DefaultSaveExcel(Workbook wb, ref bool Cancel)
    {
        while (wb.Saved == false && Cancel == false)
        {
            var result = ShowMessageDialogSave();

            if (result == System.Windows.Forms.DialogResult.Yes)
            {
                var sa = CreateExcelSaveDialog(wb.FullName);

                if (sa.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    wb.SaveAs(sa.FileName);
                    wb.Save();

                }
            }
            else if (result == System.Windows.Forms.DialogResult.No)
            {
                wb.Saved = true;
            }
            else if (result == System.Windows.Forms.DialogResult.Cancel)
            {
                Cancel = true;
            }
        }
    }

    public  System.Windows.Forms.SaveFileDialog CreateExcelSaveDialog(string name = null)
    {
        var sa = new System.Windows.Forms.SaveFileDialog();
        sa.Filter = "Excel files (*.xlsx)|*.xlsx";
        if (!string.IsNullOrEmpty(name))
            sa.FileName = name;
        sa.CreatePrompt = true;

        return sa;
    }

    public  DialogResult ShowMessageDialogSave()
    {
        var app = (Microsoft.Office.Interop.Excel.Application)ExcelDna.Integration.ExcelDnaUtil.Application;
        NativeWindow xlMain = new NativeWindow();
        xlMain.AssignHandle(new IntPtr(app.Hwnd));

        var message = "Do you want to save pending changes?";

        if (Thread.CurrentThread.CurrentCulture.TwoLetterISOLanguageName.ToLower() == "es")
            message = "¿Desea guardar los cambios pendientes?";


        return System.Windows.Forms.MessageBox.Show(xlMain, message, "Microsoft Excel", System.Windows.Forms.MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning,MessageBoxDefaultButton.Button1);
    }

public override void OnBeginShutdown(ref Array custom)
{
    base.OnBeginShutdown(ref custom);

    //I PUT MY CUSTOM CODE HERE:
    CloseAllPanes();

    ExcelTaskExecutor.Destroy();
}

希望这有帮助，

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阿曼多

阿曼多！非常感谢你的帮助

我发现有一个IDTExtensibility2接口，它承载加载项发生的事件通知，例如加载、卸载、更新等等。因此，我将该接口用于命名空间ExcelDna中的ExcelComAddIn类。集成：

public class ExcelComAddIn : IDTExtensibility2
{
    public ExcelComAddIn();

    protected string ProgId { get; }

    public virtual void OnAddInsUpdate(ref Array custom);
    public virtual void OnBeginShutdown(ref Array custom);
    public virtual void OnConnection(object Application, ext_ConnectMode ConnectMode, object AddInInst, ref Array custom);
    public virtual void OnDisconnection(ext_DisconnectMode RemoveMode, ref Array custom);
    public virtual void OnStartupComplete(ref Array custom);
}

我注意到onBeginShutton（）方法在对话框提示后运行！这就是我想要的，所以我去掉了WorkbookBeforeClose事件，重写了onBeginShutton（）方法，并将WorkbookBeforeClose事件中的代码放入onBeginShutton（）中，如下所示：

  private void ActiveWorkbook_BeforeClose(ref bool Cancel)
    {
        DefaultSaveExcel(Excel.ActiveWorkbook,ref Cancel);

        if (!Cancel)
        {
            //if enters here is because the workbook is actually closing
            Delete(Excel.ActiveWorkbook.Name);
        }                     
    }

 public  void DefaultSaveExcel(Workbook wb, ref bool Cancel)
    {
        while (wb.Saved == false && Cancel == false)
        {
            var result = ShowMessageDialogSave();

            if (result == System.Windows.Forms.DialogResult.Yes)
            {
                var sa = CreateExcelSaveDialog(wb.FullName);

                if (sa.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    wb.SaveAs(sa.FileName);
                    wb.Save();

                }
            }
            else if (result == System.Windows.Forms.DialogResult.No)
            {
                wb.Saved = true;
            }
            else if (result == System.Windows.Forms.DialogResult.Cancel)
            {
                Cancel = true;
            }
        }
    }

    public  System.Windows.Forms.SaveFileDialog CreateExcelSaveDialog(string name = null)
    {
        var sa = new System.Windows.Forms.SaveFileDialog();
        sa.Filter = "Excel files (*.xlsx)|*.xlsx";
        if (!string.IsNullOrEmpty(name))
            sa.FileName = name;
        sa.CreatePrompt = true;

        return sa;
    }

    public  DialogResult ShowMessageDialogSave()
    {
        var app = (Microsoft.Office.Interop.Excel.Application)ExcelDna.Integration.ExcelDnaUtil.Application;
        NativeWindow xlMain = new NativeWindow();
        xlMain.AssignHandle(new IntPtr(app.Hwnd));

        var message = "Do you want to save pending changes?";

        if (Thread.CurrentThread.CurrentCulture.TwoLetterISOLanguageName.ToLower() == "es")
            message = "¿Desea guardar los cambios pendientes?";


        return System.Windows.Forms.MessageBox.Show(xlMain, message, "Microsoft Excel", System.Windows.Forms.MessageBoxButtons.YesNoCancel, MessageBoxIcon.Warning,MessageBoxDefaultButton.Button1);
    }

public override void OnBeginShutdown(ref Array custom)
{
    base.OnBeginShutdown(ref custom);

    //I PUT MY CUSTOM CODE HERE:
    CloseAllPanes();

    ExcelTaskExecutor.Destroy();
}

现在，如果用户选择单击“保存”对话框上的“取消”，OnBeginShutdown（）将不会运行，我的窗格仍在那里

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不管怎么说，你的方法很酷，如果不是你的帮助，我从来没有机会弄清楚到底发生了什么，谢谢你让我走上找到这个解决方案的轨道

我刚刚尝试了这个，单击“取消”后，我的加载项仍然加载。当然Excel不会卸载您的外接程序-您确定这就是正在发生的事情吗？嗨，Jim！谢谢你的回复。您使用的是什么版本的Excel DNA？0.34.6。如果您仔细想想，当用户保持Excel打开时，Excel卸载所有加载项确实是一个错误。为什么您认为它正在卸载您的加载项？肯定还有其他原因。是否可能在代码中的某个地方订阅了event WorkbookBeforeClose？就我而言，即使您单击“取消”按钮，也会触发此事件。elarmando，您的位置正确！问题是，在WorkbookBeforeClose中，有一些操作可以清除侧窗格的所有内容，如您所说，即使单击“取消”，也会触发这些操作。是否有一个解决方法，在工作表关闭时做一些事情。。。我正在试图找到一种方法来知道工作簿是否真的关闭了，或者类似的解决方法，以便设置一个标志，这样我就可以运行我的代码了。谢谢，这真的很有帮助