调用线程无法访问该对象，因为另一个线程拥有它

我已经阅读了很多关于此错误的帖子，但我不明白如何在我的解决方案中解决它（（我有一个进度条对话框，其中包含一些逻辑 - 通过按钮单击从 MainFrame 调用

void OnBtnClick(object sender, RoutedEventArgs e)
{  
    ProgressDialog dlg = new ProgressDialog("");
    dlg.Closing += new CancelEventHandler(dlg_Closing);
    dlg.Closed += new EventHandler(dlg_Closed);
    //dlg.AutoIncrementInterval = 0;
    LibWrap lwrap = new LibWrap();
    DoWorkEventHandler handler = delegate
    {
        BitmapFrame bf = wrap.engine(BitmapFrame.Create(FXPhotoStudio.App
                                                            .draggedImage),
                                     this.fxPSEditorView); 
    };
    dlg.CurrentLibWrap = lwrap;
    dlg.AutoIncrementInterval = 100;
    dlg.IsCancellingEnabled = true;
    dlg.Owner = Application.Current.MainWindow;
    dlg.RunWorkerThread(0, handler); 
}

在该进度条对话框的关闭事件上，同一类（MainFrame）中还有一个处理程序

void dlg_Closed(object sender, EventArgs e)
{
    try
    { 
        mainFrameView.CurrentImage = effectedImage;//!error here!
    }
}

effectedImage 是 MainFrame 的一个字段。它是由我的 ProgressDialog 设置的。 我在 ProgressDialog.cs 中进行以下操作：

(this.Owner as MainFrame).effectedImage = currentLibVrap.GetEffectedImage;

currentLibVrap被设置在OnBtnClick- 往上看 有人能帮我解决这个问题吗？

这是关闭 ProgressBarDialog 的代码：

    private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
      if (!Dispatcher.CheckAccess())
      {
        //run on UI thread
        RunWorkerCompletedEventHandler handler = worker_RunWorkerCompleted;
        Dispatcher.Invoke(DispatcherPriority.SystemIdle, handler, new object[] {sender, e}, null);
        return;
      }

      if (e.Error != null)
      {
        error = e.Error;
      }
      else if (!e.Cancelled)
      {
        //assign result if there was neither exception nor cancel

          (this.Owner as MainWindow).effectedImage = currentLibVrap.GetEffectedImage;//! ok there

        result = e.Result;
      }

  //update UI in case closing the dialog takes a moment
 // progressTimer.Stop();
  progressBar.Value = progressBar.Maximum;
  btnCancel.IsEnabled = false;

  //set the dialog result, which closes the dialog
  DialogResult = error == null && !e.Cancelled;
}

还有工作流程：

/// Launches a worker thread which is intended to perform
/// work while progress is indicated, and displays the dialog
/// modally in order to block the calling thread.
/// </summary>
/// <param name="argument">A custom object which will be
/// submitted in the <see cref="DoWorkEventArgs.Argument"/>
/// property <paramref name="workHandler"/> callback method.</param>
/// <param name="workHandler">A callback method which is
/// being invoked on a background thread in order to perform
/// the work to be performed.</param>


   public bool RunWorkerThread(object argument, DoWorkEventHandler workHandler)
    {
      if (autoIncrementInterval.HasValue)
      {
        //run timer to increment progress bar
        progressTimer.Interval = TimeSpan.FromMilliseconds(autoIncrementInterval.Value);
        progressTimer.Start();
         // LibWrap lwrap = new LibWrap();
         // BitmapFrame bf = lwrap.engine(BitmapFrame.Create(FXPhotoStudio.App.draggedImage));//(aa.Image);

      }

      //store the UI culture
      uiCulture = CultureInfo.CurrentUICulture;

      //store reference to callback handler and launch worker thread
      workerCallback = workHandler;
      worker.RunWorkerAsync(argument);

      //display modal dialog (blocks caller)
      return ShowDialog() ?? false;
    }

/// <summary>
/// Worker method that gets called from a worker thread.
/// Synchronously calls event listeners that may handle
/// the work load.
/// </summary>
private void worker_DoWork(object sender, DoWorkEventArgs e)
{
  try
  {
    //make sure the UI culture is properly set on the worker thread
    Thread.CurrentThread.CurrentUICulture = uiCulture;
    //invoke the callback method with the designated argument
    workerCallback(sender, e);
  }
  catch (Exception)
  {
    //disable cancelling and rethrow the exception
    //Dispatcher.BeginInvoke(DispatcherPriority.Normal,
     //                      (SendOrPostCallback) delegate { btnCancel.SetValue(Button.IsEnabledProperty, false); },
    //                       null);
    return;
    //throw;
  }
}

您可以使用 Dispather.Invoke 或 Dispatcher.BeginInvoke。它们都会编组对 UI 线程的调用（这就是您的错误的原因），BeginInvoke 设计用于在后台线程中运行繁重的操作，而 Invoke 只是一个编组器，因此对于您的任务类型，我会坚持使用最后一个一。

这是你如何做到的（假设mainFrameView.CurrentImage is of Image输入，否则只需更改为任何内容）：

C#

更新 1 对参数使用唯一的名称，以避免与现有变量名称冲突。

mainFrameView.Dispatcher.Invoke(new Action<object>((myImage2012) => 
{ mainFrameView.CurrentImage = (Image)myImage2012; }), 
new object[1] { effectedImage });