从类访问室外控件 - VB.NET

Question

嗨，我很抱歉提出'虚假问题'。我有一个类，它必须使我的工作区（PictureBox）无效以执行一些动作。但我无法做到，因为它完全没有运行。

我的课程：

Public Class clsLayoutObject
    Private tmrAnimation As New Timer

    Public oID As UInteger
    Public oName As String
    Public oGraphic As New List(Of Image)
    Public oMaxFrame As UInteger
    Public oActiveFrame As UInteger
    Public oFrameRate As UInteger = 100
    Public oX As Integer, oY As Integer
    Public oWidth As Integer, oHeight As Integer
    Public oDepth As UInteger
    Public oLocked As Boolean
    Public oVisible As Boolean

    Private tempActiveFrame As UInteger

    Private Sub playAnimation()
        AddHandler tmrAnimation.Elapsed, New ElapsedEventHandler(AddressOf animationPlayback)
        tmrAnimation.Interval = oFrameRate
        tmrAnimation.Start()
        tempActiveFrame = oActiveFrame
    End Sub

    Private Sub animationPlayback()
        --> frmmain.Workspace.Invalidate()
        If oActiveFrame < oMaxFrame Then
            oActiveFrame += 1
        Else
            oActiveFrame = 0
        End If
    End Sub

    Private Sub animationPause()
        tmrAnimation.Stop()
        frmmain.Workspace.Invalidate()
    End Sub

    Private Sub animationStop()
        oActiveFrame = tempActiveFrame
        tmrAnimation.Stop()
        frmmain.Workspace.Invalidate()
    End Sub
End Class

我对OO编程不太熟悉，而且我还在改进。感谢。