WPF System.InvalidOperationException: The calling thread cannot access this object because a different thread owns it

Question

In my Windows I have a TextBox which I like to update (text property) from another thread. When doing so, I get the InvalidOperationException (see title). I have found diffe

Answer 1

For WPF, I find this construct:

 BackgroundWorker bw = new BackgroundWorker();
  bw.DoWork += ( s, e ) =>
  {
  };
  bw.RunWorkerCompleted += ( s, e ) =>
  {
  };
  bw.RunWorkerAsync();

to be the most useful. The RunWorkerCompleted block will typically update an ObservableCollection or fire off a RaisePropertyChangedEvent.

Answer 2

Window1.MyWindow.informationTextBox.Dispatcher.Invoke(
    DispatcherPriority.Normal,
    new Action(() => Window1.MyWindow.informationTextBox.Text += value));

Answer 3

Well, using Dispatcher.Invoke or BeginInvoke is definitely the way to go, but you haven't really shown much code other than creating a thread - for example, you haven't started the thread in your second code block.

If you put the Dispatcher.Invoke code in the place where previously you were getting an InvalidOperationException, it should be fine.