调用线程无法访问此对象，因为不同的线程拥有它，WPF [重复]

3 回答

• 27

  ui elememt只能由一个UI线程访问 . CheckBox需要UI线程，您的计时器在不同的线程上运行 . 使用Dispatcher的简单代码

  if (client.Connected == true)
  {
      Dispatcher.Invoke(()=> {
          // Code causing the exception or requires UI thread access
          CheckBox.IsChecked =true;
      });
  }
  

  要么

  if (client.Connected == true)
  {
      Dispatcher.Invoke(new Action(()=> {
          // Code causing the exception or requires UI thread access
          CheckBox.IsChecked =true;
      }));
  }
  

  如果您收到错误 An object reference is required for the non-static field, method, or property ，请使用此

  Application.Current.Dispatcher.Invoke(() =>
   {
       // Code causing the exception or requires UI thread access
   });
  

  回复于 2024-05-20T05:45:05+08:00
• 2

  如果您由于某种原因不想使用Dispatcher，可以使用SynchronizationContext . 没有太大的区别，但是在使用SynchronizationContext时我感觉不那么内疚，因为它不是WPF特定的类：

  private static System.Timers.Timer aTimer;
  private SynchronizationContext _uiContext = SynchronizationContext.Current;
  
  public MainWindow()
  {
      InitializeComponent();
  
      client.BeginConnect(remoteEP, new AsyncCallback(ConnectCallback), client);
      aTimer = new System.Timers.Timer();
      aTimer.AutoReset = true;
      aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
  
      aTimer.Interval = 2000;
      aTimer.Enabled = true;
  }
  private void OnTimedEvent(object source, ElapsedEventArgs e)
  {
  
      _uiContext.Post(new SendOrPostCallback(new Action<object>(o => {
          if (client.Connected == true)
          {
              Console.WriteLine("Not Connected");
              CheckBox.IsChecked = false;
          }
          else
          {
              Console.WriteLine("Connected");
              CheckBox.IsChecked = false;
          }
      })), null);
  }
  

  回复于 2024-05-20T05:45:05+08:00
• 5

  试试这个：

  System.Windows.Application.Current.Dispatcher.Invoke(
  System.Windows.Threading.DispatcherPriority.Normal, (Action)delegate
  {
      // Update UI component here
      CheckBox.IsChecked = false;
  });
  

  回复于 2024-05-20T05:45:05+08:00