主用户界面窗口未更新控件-跨线程操作无效 [英] Main UI windows not updating control -Cross-thread operation not valid

问题描述

好..这是问题所在

我有一个主要的UI窗体，该窗体具有一个控件容器，可以向其中添加一些按钮项，也有一个启动列表器的backgroundworker对象.当列表事件触发时，我想在主UI窗体上的该控件容器中创建一个按钮.在我尝试向该容器中添加新控件之前，一切似乎都可以正常工作.我收到以下异常

I have a main UI form that has a control container that i can add some buttons item to it,and also i have a backgroundworker object that starts up a listner. When the listner events fire, i would like to create a button in that control container on the main UI form. Everything seems to work fine until i try to add a new control item to that container. I get the following exception

跨线程操作无效:控制'RadMagnifier_AcceptReject'从创建该线程的线程之外的其他线程访问."

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

代码像这样

Private Sub Mainform_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Me.SessionTableAdapter.Fill(Me.BCSSDataSet1.Session)
    FormatColumns()
    Me.BackgroundWorker2.RunWorkerAsync()
End Sub

Private Sub BackgroundWorker2_DoWork(ByVal sender As Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker2.DoWork
    Notifications()
End Sub


Private Sub Notifications()
    'Start listing for events when event is fired try to add a button to a controls container on the UI thread, and that when i get the problem
End Sub

推荐答案

假设您将所有UI操作都移到RunWorkerCompleted方法中，则它看起来像个错误:

Assuming you moved all UI operations into the RunWorkerCompleted method, it looks like a bug:

http://connect.microsoft.com/VisualStudio/feedback /ViewFeedback.aspx?FeedbackID=116930 http://thedatafarm.com/devlifeblog/archive/2005/12/21/39532.aspx

我建议使用防弹(伪代码):

I suggest using the bullet-proof (pseudocode):

if(control.InvokeRequired)
  control.Invoke(Action);
else
  Action()

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