vb.net - Timer_tick 无法停止的问题

Question

我对编程和 vb.net 非常陌生，尝试更多地自学作为一种爱好，因为我有一个我认为有用的程序的想法，但我在解决这个问题时遇到了困难，我相信这与计时器有关。

我有一个大小为(600,600)的表单，其中有一个大小为(450,150)的按钮，该按钮在表单上设置位置(100,50)。单击时，我想降低其自身的高度，然后在其位置添加一个新按钮。下面包含的代码在前两次单击时按预期工作，但在第三次单击时按钮继续移动并且自动滚动栏延伸。我最初以为是自动滚动功能或位置属性，但意识到随着按钮不断移动，计时器并没有停止。我知道代码在实现结果方面可能非常笨拙，并且编译器当前跳过了一些行/变量(这些来自较早的尝试来解决这个问题)。

我环顾四周，找不到问题的原因。任何帮助将不胜感激。如果代码块看起来很困惑，我们深表歉意 - 首先。

Public Class frmOpenScreen
Dim intWButtons, intCreateButtonY, intCreateButtonX 'intTimerTick As Integer
Dim arrWNames() As String
Dim ctrlWButtons As Control
Dim blnAddingW As Boolean

Private Sub btnCreateW_Click(sender As System.Object, e As System.EventArgs) Handles btnCreateW.Click
    'Creates new Button details including handler
    Dim strWName, strWShort As String
    Dim intCreateButtonY2 As Integer
    Static intNumW As Integer
    Dim B As New Button

    strWName = InputBox("Please enter the name name of the button you are creating. Please ensure the spelling is correct.", "Create W")
    If strWName = "" Then
        MsgBox("Nothing Entered.")
        Exit Sub
    End If
    strWShort = strWName.Replace(" ", "")
    B.Text = strWName
    B.Width = 400
    B.Height = 150
    B.Font = New System.Drawing.Font("Arial Narrow", 21.75)
    B.AutoSizeMode = Windows.Forms.AutoSizeMode.GrowAndShrink
    B.Anchor = AnchorStyles.Top
    B.Margin = New Windows.Forms.Padding(0, 0, 0, 0)
    'Updates Crucial Data (w name array, number of w buttons inc Create New)
    If intNumW = 0 Then
        ReDim arrWNames(0)
    Else
        intNumW = UBound(arrWNames) + 1
        ReDim Preserve arrWNames(intNumW)
    End If
    arrWNames(intNumW) = strWShort
    intNumW = intNumW + 1
    intWButtons = WButtonCount(intWButtons) + 1
    'updates form with new button and rearranges existing buttons
    intCreateButtonY = btnCreateW.Location.Y
    intCreateButtonX = btnCreateW.Location.X
    ‘intTimerTick = 0
    tmrButtonMove.Enabled = True
    ‘Do While intTimerTick < 16
    ‘    'blank to do nothing
    ‘Loop
    'btnCreateW.Location = New Point(intCreateButtonX, intCreateButtonY + 150)
    B.Location = New Point(intCreateButtonX, intCreateButtonY)
    Me.Controls.Add(B)
    B.Name = "btn" & strWShort
    intCreateButtonY2 = btnCreateW.Location.Y
    If intCreateButtonY2 > Me.Location.Y Then
        Me.AutoScroll = False
        Me.AutoScroll = True
    Else
        Me.AutoScroll = False
    End If
    'MsgBox(intCreateButtonY)
End Sub

Function WButtonCount(ByRef buttoncount As Integer) As Integer
    buttoncount = intWButtons
    If buttoncount = 0 Then
        Return 1
    End If
    Return buttoncount
End Function

Public Sub tmrButtonMove_Tick(sender As System.Object, e As System.EventArgs) Handles tmrButtonMove.Tick
Dim intTimerTick As Integer
    If intTimerTick > 14 Then
        intTimerTick = 0
    End If
    If btnCreateW.Location.Y <= intCreateButtonY + 150 Then
        btnCreateW.Top = btnCreateW.Top + 10
    End If
    intTimerTick += 1
If intTimerTick = 15 Then
        tmrButtonMove.Enabled = False
    End If
End Sub

End Class

所以我目前的理解是，tick事件处理程序应该在每次触发时增加timertick变量，并且一旦它达到15，它应该禁用计时器并停止按钮移动，但它没有这样做。

提前致谢。

Answer 1

IntTimerTick 在每个 Tick 事件开始时初始化为 0。如果您将其声明为静态，则不会发生这种情况:

Static Dim intTimerTick As Integer