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);
}