0

在我的程序（form1）中，我用Form3.ShowDialog(). 此表单运行一个由进度条跟踪的相对较长的过程。在此表单中，有一个按钮可以取消此过程（生成 pdf 文档）并恢复该过程。

取消按钮（form3）的代码如下：

Private Sub annulerBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles annulerBtn.Click
        If (MsgBox("Êtes-vous sûr de vouloir annuler? Cette reviendra toutes les modifications apportées au document", MsgBoxStyle.YesNo, "annuler l'exportation") = MsgBoxResult.Yes) Then

            _cancel = True

            doc.Close()       'close pdf'
            fs.Close()        'close stream'

            If (_done And _backup) Or (Not _done And _backup) Then

                'revert file from backup if backup exists'
                System.IO.File.Delete(_path)
                IO.File.Copy("C:\temp\temp.pdf", _path)
                IO.File.Delete("C:\temp\temp.pdf")

            Else

                'otherwise simply delete the new file'
                System.IO.File.Delete(_path)

            End If

            Me.Close()
        Else
            'continue with the form!!'
        End If
    End Sub

我希望此按钮结束该过程并使用备份恢复更改。

我目前远离多线程，我使用Application.DoEvents()进程内部继续接受用户输入。

如果用户按下是按钮，则该功能按预期工作。但是，如果用户按否，该过程将按预期继续，但随后表单将关闭！

调试表明它从不调用Me.Close()或Form3.Close()在用户按否之后调用。

任何有关此问题的帮助将不胜感激，谢谢！

编辑：这是调用堆栈

    App58.exe!App58.Form3.Form3_FormClosing(Object sender = {App58.Form3}, System.Windows.Forms.FormClosingEventArgs e = {System.Windows.Forms.FormClosingEventArgs}) Line 432  Basic
    System.Windows.Forms.dll!System.Windows.Forms.Form.OnFormClosing(System.Windows.Forms.FormClosingEventArgs e) + 0x77 bytes  
    System.Windows.Forms.dll!System.Windows.Forms.Form.CheckCloseDialog(bool closingOnly = false) + 0x8c bytes  
    System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FContinueMessageLoop(int reason, int pvLoopData, System.Windows.Forms.NativeMethods.MSG[] msgPeeked) + 0x160 bytes   
    System.Windows.Forms.dll!System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(int dwComponentID, int reason = 4, int pvLoopData = 0) + 0x1ae bytes  
    System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(int reason = 4, System.Windows.Forms.ApplicationContext context = {System.Windows.Forms.Application.ModalApplicationContext}) + 0x177 bytes 
    System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessageLoop(int reason, System.Windows.Forms.ApplicationContext context) + 0x61 bytes    
    System.Windows.Forms.dll!System.Windows.Forms.Application.RunDialog(System.Windows.Forms.Form form) + 0x33 bytes    
    System.Windows.Forms.dll!System.Windows.Forms.Form.ShowDialog(System.Windows.Forms.IWin32Window owner) + 0x370 bytes    
    System.Windows.Forms.dll!System.Windows.Forms.Form.ShowDialog() + 0x7 bytes 
    App58.exe!App58.Form1.RB_pdf_Click(Object sender = {Text = "Exporter PDF"}, System.EventArgs e = {System.Windows.Forms.MouseEventArgs}) Line 1994 + 0xa bytes   Basic
4

1 回答 1

3

一个疯狂的猜测，你告诉我它是否正确。

DialogResult按钮的属性annulerBtn设置为不同于None.
或者 form3 的属性CancelButtonorAcceptButton设置为annulerBtn

如果其中一个条件为真，那么当您单击该按钮时，您的表单将自动关闭，无论您是否调用该Close方法。如果要停止此事件链，则应在退出单击事件之前将form3.DialogResult属性设置为。DialogResult.None（或者通过上面的属性去掉表单和按钮设置的关联）

于 2013-10-24T22:18:45.217 回答