ui线程和后台线程异步

 private void Button_Click(object sender, RoutedEventArgs e)
        {
                 
         
            CreateElementOnSeperateThread(() =>
            {
                
              
                var loadsOfItems = new List<int>();
                for (var i = 0; i < 100000; i++)
                    loadsOfItems.Add(i + 12);


                var dataGrid = new DataGrid { ItemsSource = loadsOfItems, Width = 500, Height = 500 };

                dataGrid.Measure(new Size(500, 500));
                dataGrid.Arrange(new Rect(0, 0, 500, 500));


                return dataGrid;
            }, result => SampleGrid1.Children.Add(result));

        }

        public void CreateElementOnSeperateThread(Func<UIElement> constructObject, Action<UIElement> constructionCompleted)
        {
            VerifyAccess();

            // save dispatchers for future usage.
            // we create new element on a seperate STA thread
            // and then basically swap UIELEMENT's Dispatcher.
            Dispatcher threadDispatcher = null;
            var currentDispatcher = Dispatcher.CurrentDispatcher;

            var ev = new AutoResetEvent(false);
            var thread = new Thread(() =>
            {
                threadDispatcher = Dispatcher.CurrentDispatcher;
                ev.Set();

                Dispatcher.Run();
            });

            thread.SetApartmentState(ApartmentState.STA);
            thread.IsBackground = true;
            thread.Start();

            ev.WaitOne();

            threadDispatcher.BeginInvoke(new Action(() =>
            {
                var constructedObject = constructObject();
                currentDispatcher.BeginInvoke(new Action(() =>
                {
                    var fieldinfo = typeof(DispatcherObject).GetField("_dispatcher",
                                                                       BindingFlags.NonPublic |
                                                                       BindingFlags.Instance);
                    if (fieldinfo != null)
                        fieldinfo.SetValue(constructedObject, currentDispatcher);

                    constructionCompleted(constructedObject);
                    threadDispatcher.BeginInvokeShutdown(DispatcherPriority.Normal);
                }), DispatcherPriority.Normal);
            }), DispatcherPriority.Normal);
        }

 

转载于:https://www.cnblogs.com/naliang/p/ui%e5%bc%82%e6%ad%a5.html