vb.net 带有 YesNoCancel 的 MessageBox - No & Cancel 触发相同的事件

MessageBox with YesNoCancel - No & Cancel triggers same event

提问by Bibhas Debnath

I have a message box with the YesNoCancelbuttons...

我有一个带有YesNoCancel按钮的消息框...

• Pressing Yeswill do some action and close the application - works fine
• Pressing Nowill do nothing and close the application - (see below)
• Pressing Cancelwill do nothing and keep the application open - (see below).

• 按Yes将执行一些操作并关闭应用程序 - 工作正常
• 按No将什么都不做并关闭应用程序 - （见下文）
• 按Cancel将什么也不做，并保持应用程序打开 - （见下文）。

I'm using DialogResult.Nofor the Nobutton and DialogResult.Cancelfor the Cancelbutton. But pressing either of them triggers DialogResult.Cancelevent. What's the problem?

我使用DialogResult.No的No按钮，并DialogResult.Cancel为Cancel按钮。但是按下它们中的任何一个都会触发DialogResult.Cancel事件。有什么问题？

回答by Darin Dimitrov

This should work fine:

这应该可以正常工作：

Dim result As DialogResult = MessageBox.Show("message", "caption", MessageBoxButtons.YesNoCancel)
If result = DialogResult.Cancel Then
    MessageBox.Show("Cancel pressed")
ElseIf result = DialogResult.No Then
    MessageBox.Show("No pressed")
ElseIf result = DialogResult.Yes Then
    MessageBox.Show("Yes pressed")
End If

回答by Orlando Herrera

I see all the answers are correct. I just want to write a little different piece of code. In my opinion, you may do it without using an extra variable to save the result of the dialogBox. Take a look:

我看到所有的答案都是正确的。我只想写一点不同的代码。在我看来，您可以不使用额外的变量来保存 dialogBox 的结果。看一看：

VB Code

VB代码

Select Case MsgBox("Your Message", MsgBoxStyle.YesNoCancel, "caption")
                    Case MsgBoxResult.Yes
                        MessageBox.Show("Yes button")
                    Case MsgBoxResult.Cancel
                        MessageBox.Show("Cancel button")
                    Case MsgBoxResult.No
                        MessageBox.Show("NO button")
 End Select

C# Code

C# 代码

switch (MessageBox.Show("Message", "caption", MessageBoxButtons.YesNoCancel))
        {
            case DialogResult.Yes: MessageBox.Show("Yes"); break;
            case DialogResult.No: MessageBox.Show("No"); break;
            case DialogResult.Cancel: MessageBox.Show("Cancel");  break;
        }

回答by yousafkamal

dim result as dialogresult
result = MessageBox.Show("message", "caption", MessageBoxButtons.YesNoCancel)
If result = DialogResult.Cancel Then
    MessageBox.Show("Cancel pressed")
ElseIf result = DialogResult.No Then
    MessageBox.Show("No pressed")
ElseIf result = DialogResult.Yes Then
    MessageBox.Show("Yes pressed")
End If

回答by David Kittell

Just to add a bit to Darin's example, the below will show an icon with the boxes. http://msdn.microsoft.com/en-us/library/system.windows.forms.messagebox(v=vs.110).aspx

只是在 Darin 的示例中添加一点，下面将显示一个带有框的图标。 http://msdn.microsoft.com/en-us/library/system.windows.forms.messagebox(v=vs.110).aspx

Dim result = MessageBox.Show("Message To Display", "MessageBox Title", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question)

If result = DialogResult.Cancel Then

    MessageBox.Show("Cancel Button Pressed", "MessageBox Title",MessageBoxButtons.OK , MessageBoxIcon.Exclamation)

ElseIf result = DialogResult.No Then

    MessageBox.Show("No Button Pressed", "MessageBox Title", MessageBoxButtons.OK, MessageBoxIcon.Error)

ElseIf result = DialogResult.Yes Then

    MessageBox.Show("Yes Button Pressed", "MessageBox Title", MessageBoxButtons.OK, MessageBoxIcon.Information)

End If

回答by Prashant Koli

Use:

用：

Dim n As String = MsgBox("Do you really want to exit?", MsgBoxStyle.YesNo, "Confirmation Dialog Box")
If n = vbYes Then
    MsgBox("Current Form is closed....")
    Me.Close() 'Current Form Closed
    Yogi_Cottex.Show() 'Form Name.show()
End If

回答by Suji

Closing conformation alert:

关闭构象警报：

Private Sub cmd_exit_click()

    ' By clicking on the button the MsgBox will appear
    If MsgBox("Are you sure want to exit now?", MsgBoxStyle.YesNo, "closing warning") = MsgBoxResult.Yes Then ' If you select yes in the MsgBox then it will close the window
               Me.Close() ' Close the window
    Else
        ' Will not close the application
    End If
End Sub

回答by DLS Discovery

The way I use a yes/no prompt is:

我使用是/否提示的方式是：

If MsgBox("Are you sure?", MsgBoxStyle.YesNo) <> MsgBoxResults.Yes Then
    Exit Sub
End If

回答by Elias Wick

This is how you can do it without a Dim, using MessageBox.Showinstead of MsgBox. This is in my opinion the cleanest way of writing it!

这就是你可以在没有 的情况下做到这一点Dim，使用MessageBox.Show代替MsgBox。在我看来，这是最干净的写作方式！

Select Case MessageBox.Show("Message", "Title", MessageBoxButtons.YesNo)
    Case vbYes
        ' Other Code goes here
    Case vbNo
        ' Other Code goes here
End Select

You can shorten it down even further by using If:

您可以使用If以下命令进一步缩短它：

If MessageBox.Show("Message", "Title", MessageBoxButtons.YesNo) = vbYes Then
    ' Other Code goes here
End If

回答by Tanmay Nehete

Try this

尝试这个

MsgBox("Are you sure want to Exit", MsgBoxStyle.YesNo, "")
                If True Then
                    End
                End If