ThreadPool.QueueUserWorkItem(delegate
    {
        SynchronizationContext.SetSynchronizationContext(new
            System.Windows.Threading.DispatcherSynchronizationContext(Application.Current.Dispatcher));
        SynchronizationContext.Current.Post(pl =>
        {
            //这里写要执行的代码
        }, null);
    });

复制粘贴能跑就行