VB.NET跨线程操作无效

Question

我有一个循环（BackgroundWorker的），这种情况正在改变一个图片的位置非常频繁，但我发现了一个错误 -

Cross-thread operation not valid: Control 'box1' accessed from a thread other than the 
    thread it was created on. 

我不明白，在它所有，所以我希望有人能帮助我解决这个问题。

代码：

box1.Location = New Point(posx, posy) 

Answer 1

当你试图从比它创建的线程其他线程访问控制，抛出此异常。

为了解决这个问题，您需要使用InvokeRequired属性来查看是否需要更新控件，并更新控件，以便使用委托。我认为你需要做这在您的backgroundWorker_DoWork方法

Private Delegate Sub UpdatePictureBoxDelegate(Point p) 

Dim del As New UpdatePictureBoxDelegate(AddressOf UpdatePictureBox) 

Private Sub UpdatePictureBox(Point p) 
    If pictureBoxVariable.InvokeRequired Then 

     Dim del As New UpdatePictureBoxDelegate(AddressOf UpdatePictureBox) 
     pictureBoxVariable.Invoke(del, New Object() {p}) 
    Else 
     ' this is UI thread  
    End If 
End Sub 

Answer 2

对于横跨这个错误来其他人：

尝试分派对象：MSDN

我的代码：

Private _dispatcher As Dispatcher 

Private Sub ThisAddIn_Startup(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Startup 
    _dispatcher = Dispatcher.CurrentDispatcher 
End Sub 

Private Sub otherFunction() 
    ' Place where you want to make the cross thread call 
    _dispatcher.BeginInvoke(Sub() ThreadSafe()) 
End Sub 

Private Sub ThreadSafe() 
    ' here you can make the required calls 
End Sub