This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread

  ObservableCollection<UserListViewModel> users = new ObservableCollection<UserListViewModel>();public ObservableCollection<UserListViewModel> Users{get { return users; }set { users = value; }}

        /// <summary>    /// 开启监听线程     /// </summary>      private void openListeningThread(){isRun = true;Thread t = new Thread(new ThreadStart(() =>{IPEndPoint ipEnd = new IPEndPoint(broadIPAddress, lanPort);try{while (isRun){try{byte[] recInfo = listenClient.Receive(ref ipEnd);  //接受内容,存储到byte数组中              DealWithAcceptedInfo(recInfo); //处理接收到的数据
                        }catch (Exception ex) { MessageBox.Show(ex.Message); }} listenClient.Close(); isRun = false;}catch (SocketException se) { throw new SocketException(); }  //捕捉试图访问套接字时发生错误。      catch (ObjectDisposedException oe) { throw new ObjectDisposedException(oe.Message); } //捕捉Socket 已关闭        catch (InvalidOperationException pe) { throw new InvalidOperationException(pe.Message); } //捕捉试图不使用 Blocking 属性更改阻止模式。   catch (Exception ex) { throw new Exception(ex.Message); }}));t.Start();}/// <summary>        /// 方法：处理接到的数据       /// </summary>        private void DealWithAcceptedInfo(byte[] recData){BinaryFormatter formatter = new BinaryFormatter();MessageFlag recvMessageFlag;MemoryStream ms = new MemoryStream(recData);try { recvMessageFlag = (MessageFlag)formatter.Deserialize(ms); }catch (SerializationException e) { throw; }UserListViewModel uListViewModel = new UserListViewModel(new UserDetailModel { MyIP = recvMessageFlag.UserIP, MyName = recvMessageFlag.UserName });switch (recvMessageFlag.Flag){case "0x00"://这里很关键，当检测到一个新的用户上线，那么我们需要给这个新用户发送自己的机器消息，以便新用户能够自动添加进列表中。
                    SendInfoOnline(recvMessageFlag.UserIP);if (!list.Contains(uListViewModel.MyInfo)){list.Add(uListViewModel.MyInfo);Users.Add(uListViewModel);}break;case "0x01"://AddTextBox(, int titleOrContentFlag, int selfOrOthersFlag);//AddTextBox(string info, int titleOrContentFlag, int selfOrOthersFlag);break;case "0x02":break;case "0x03":if (list.Contains(uListViewModel.MyInfo)){// list.Remove(uListViewModel.MyInfo);
                        Users.Remove(uListViewModel);}break;default: break;}}

public class AsyncObservableCollection<T> : ObservableCollection<T>
{//获取当前线程的SynchronizationContext对象private SynchronizationContext _synchronizationContext = SynchronizationContext.Current;public AsyncObservableCollection() { }public AsyncObservableCollection(IEnumerable<T> list) : base(list) { }protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e){if (SynchronizationContext.Current == _synchronizationContext){//如果操作发生在同一个线程中，不需要进行跨线程执行
            RaiseCollectionChanged(e);}else{//如果不是发生在同一个线程中//准确说来，这里是在一个非UI线程中，需要进行UI的更新所进行的操作
            _synchronizationContext.Post(RaiseCollectionChanged, e);}}private void RaiseCollectionChanged(object param){// 执行         base.OnCollectionChanged((NotifyCollectionChangedEventArgs)param);}protected override void OnPropertyChanged(PropertyChangedEventArgs e){if (SynchronizationContext.Current == _synchronizationContext){// Execute the PropertyChanged event on the current thread
            RaisePropertyChanged(e);}else{// Post the PropertyChanged event on the creator thread
            _synchronizationContext.Post(RaisePropertyChanged, e);}}private void RaisePropertyChanged(object param){// We are in the creator thread, call the base implementation directly         base.OnPropertyChanged((PropertyChangedEventArgs)param);}
}

        AsyncObservableCollection<UserListViewModel> users = new AsyncObservableCollection<UserListViewModel>();public AsyncObservableCollection<UserListViewModel> Users{get { return users; }set { users = value; }}