AssociatedObject.Content 在一定范围后抛出异常

Question

我正在为一些用户控件附加一个行为，当我添加 UI 元素时（请参阅 IsEnable() 方法）它工作正常。在收到通知的某个时间点后，我想更新作为内容添加到用户控件的 Texblock（请参阅 LiveAnalysisIsDone() 方法）。问题是访问 CustomControlContent.Content 会抛出异常 "The calling thread cannot access this object as a different thread owns it"。请帮忙

public class UserControlLiveAnalysisBehaviour : System.Windows.Interactivity.Behavior<UserControl>
    {
        private TextBlock textBlock = new TextBlock();
        private UserControl CustomControlContent;

        private bool IsExecuted;
        protected override void OnAttached()
        {
            AssociatedObject.Loaded += UserControlLoadedHandler;
        }


        private void UserControlLoadedHandler(object sender, RoutedEventArgs e)
        {
            RegisterUserControlActivatedHandler();
            Messenger.Default.Register<Notifications>(this,
                    (n) =>
                    {
                        if (n == Notifications.LiveAnalysisComplete)
                        {
                            LiveAnalysisIsDone();
                        }
                    });
        }

        public void LiveAnalysisIsDone()
        {
            string LiveAnalysisCompleteText = System.Windows.Application.Current.TryFindResource("LiveAnalysisComplete").ToString();
            if (CustomControlContent.Content != null)  //Exception here The calling thread cannot access this object as a different thread owns it
            {
                //Remove Children from UserControl
                if (CustomControlContent.GetType() != typeof(BioRad.ddPCR.UI.Views.Analysis.Reports.ReportGeneratorUserControl))
                {
                    //var childGrid = WPFUtils.FindChild<Grid>(CustomControlContent, "ContentGrid");
                    //var c = CustomControlContent.Content as Grid;
                    //Grid child = CustomControlContent.FindName("ContentGrid") as Grid;
                    //child.Children.Remove(child.FindName("SpTextPanel") as StackPanel);
                    ////Add new children
                    //StackPanel sp = new StackPanel();
                    //sp.HorizontalAlignment = HorizontalAlignment.Center;
                    //sp.VerticalAlignment = VerticalAlignment.Center;
                    //sp.Children.Add(new TextBlock { Text = System.Windows.Application.Current.TryFindResource("LiveAnalysisComplete").ToString(), Foreground = new SolidColorBrush(TextBlockStyle()), Effect = null, HorizontalAlignment = HorizontalAlignment.Center, TextAlignment = TextAlignment.Center, FontWeight = FontWeights.SemiBold });
                    //sp.Effect = null;
                    //child.Children.Add(sp);
                    textBlock.Text = System.Windows.Application.Current.TryFindResource("LiveAnalysisComplete").ToString();

                }
            }
        }

        private void RegisterUserControlActivatedHandler()
        {
            CustomControlContent = AssociatedObject;
            if (CustomControlContent == null)
            {
                return;
            }

            var RunDataInstance = RunDataViewModel.Instance;
            RunDataViewModel.RunDataFileSession<string> session = RunDataInstance.GetLiveSessionObject();
            if (session != null)
            {
                if (session.IsLiveAnalysisSession && !IsExecuted)
                {
                    if (CustomControlContent.GetType() == typeof(BioRad.ddPCR.UI.Views.Analysis.Reports.ReportGeneratorUserControl))
                    {
                        var child = CustomControlContent.FindName("btnGenerateReport") as Button;
                        if (child != null)
                        {
                            child.IsEnabled = false;
                            IsExecuted = true;
                            return;
                        }
                    }
                    textBlock.Text = System.Windows.Application.Current.TryFindResource("LiveAnalysisInProgress").ToString();
                    IsEnabled(); 
                }
            }
        }

        private void IsEnabled()
        {
            Grid grid = new Grid();
            grid.Name = "ContentGrid";
            RowDefinition r1 = new RowDefinition();
            r1.Height = new GridLength(30, GridUnitType.Auto);
            grid.RowDefinitions.Add(r1);
            RowDefinition r2 = new RowDefinition();
            r2.Height = new GridLength(30, GridUnitType.Auto);
            grid.RowDefinitions.Add(r2);
            ContentControl cc = new ContentControl();
            StackPanel Sp = new StackPanel();
            Sp.Name = "SpTextPanel";
            Sp.HorizontalAlignment = HorizontalAlignment.Center;
            Sp.VerticalAlignment = VerticalAlignment.Center;
            Panel.SetZIndex(Sp, 1000);
            Sp.Children.Add(new TextBlock { Text = textBlock.Text, Foreground = new SolidColorBrush(TextBlockStyle()), Effect = null, HorizontalAlignment = HorizontalAlignment.Center, TextAlignment = TextAlignment.Center, FontWeight = FontWeights.SemiBold });
            Sp.Background = Brushes.Transparent;
            BlurEffect effect = new BlurEffect();
            effect.Radius = 7;
            (CustomControlContent.Content as UIElement).Effect = effect;
            Grid.SetRowSpan(cc, 2);
            Sp.Effect = null;
            cc.Content = CustomControlContent.Content;
            Grid.SetRow(Sp, 0);
            grid.Children.Add(cc);
            grid.Children.Add(Sp);
            CustomControlContent.Content = grid;
            IsExecuted = true;
        }

        public Color TextBlockStyle()
        {
            if (Brushes.White.Equals(CustomControlContent.Background) || Brushes.WhiteSmoke.Equals(CustomControlContent.Background))
            {
                return Colors.Gray;
            }
            else
            {
                return Colors.White;
            }
        }

    }

Answer 1

好的，正如其他帖子所建议的那样The calling thread cannot access this object because a different thread owns it 我正在使用 Dispatcher，它工作得很好。这是我使用 Dispatcher 更新进度的地方。

public void LiveAnalysisIsDone()
        {
            string LiveAnalysisCompleteText = System.Windows.Application.Current.TryFindResource("LiveAnalysisComplete").ToString();
            if (CustomControlContent != null)               {
                //Remove Children from UserControl
                if (CustomControlContent.GetType() != typeof(BioRad.ddPCR.UI.Views.Analysis.Reports.ReportGeneratorUserControl))
                {
                    this.Dispatcher.BeginInvoke((Action)(() =>
                    {
                        var content = CustomControlContent.Content as Grid;
                        if (content != null)
                        {
                            var Panel = content.Children[1] as StackPanel;
                            (Panel.Children[0] as TextBlock).Text = LiveAnalysisCompleteText;
                        }
                    }));


                }
            }
        }