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POWPF TabControl - cannot access this object because a different thread owns it
 

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  1. POWPF TabControl - cannot access this object because a different thread owns it
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    <p>I'm developing a WPF Login form.I have a tab control with two tabs:</p> <p>tab1) Contains the inputs for login(user name and password text box/labels)</p> <p>tab2) Contains a custom animation which is used as the progress bar</p> <p>Once the user captures all the info and clicks Login in the Login button's click event I set the active tab to tab2 and the progress bar is shown to the user. If an error occurs during this step I would like to return the user to tab1 and this is where I get the following error:</p> <p><strong>Invalid Operation Exception</strong> (The calling thread cannot access this object because a different thread owns it.)</p> <p>Please advice how I can kill the thread or any other work around to help fix my problem </p> <p><strong>My code:</strong></p> <pre><code>public partial class LogonVM : ILogonVM { private IWebService _webService; private static TabControl loaderTabs; private string userName = String.Empty; public string UserName { get { return userName; } set { userName = value; OnPropertyChanged("UserName", true); } } private SecureString password = new SecureString(); public SecureString Password { get { return password; } set { password = value; OnPropertyChanged("Password", true); } } public MinimalLogonViewModel(MinimalLogonView view,IWebService webService) { _webService = webService; View = view; view.DataContext = this; loaderTabs = (TabControl)this.View.FindName("loaderTabs"); } catch (Exception eX) { MessageBox.Show(eX.Message); } } protected virtual void OnPropertyChanged(string propertyName, bool raiseCanExecute) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); if (raiseCanExecute) LogonCommand.RaiseCanExecuteChanged(); } private void Logon(object parameter) { SetActiveTab(TabType.Loader); _messageBroker.onAuthenticated += new EventHandler(_MessageBroker_onAuthenticated); Task.Execute((DispatcherWrapper)View.Dispatcher, () =&gt; _webService.Authenticate(userName, password.ConvertToUnsecureString()), (ex) =&gt; { if (ex != null) { //This is where I'm having issues //If an error occurs I want to switch back to the Login tab which will enable the user to try Login again //This does not throw an error but it also doesn't show the Login tab SetActiveTab(TabType.Login); } else { //No error perform additional processing } }); } private void SetActiveTab(TabType type) { //If I leave the code as simply: //loaderTabs.SelectedIndex = (int)type; //I get an error when seting the tab for the second time: //Invalid Operation Exception (The calling thread cannot access this object because a different thread owns it.) loaderTabs.Dispatcher.Invoke((Action)(() =&gt; { loaderTabs.SelectedIndex = (int)type; })); } } </code></pre>
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    1. USDenys Wessels
    1. USDenys Wessels
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    1. COWhich line does the exception happen on?
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      1. POWPF TabControl - cannot access this object because a different thread owns it
      1. USDan Puzey
    2. CODo you start a Thread or Task somewhere ?
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      1. POWPF TabControl - cannot access this object because a different thread owns it
      1. USHenk Holterman
    3. COI've updated the code
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      1. POWPF TabControl - cannot access this object because a different thread owns it
      1. USDenys Wessels
 

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