Когда я пытаюсь запустить View из конструктора чужих представлений ViewModel, я получаю сообщение об ошибке:
Невозможно выполнить эту операцию, пока обработка диспетчера приостановлена
ViewModel моего вида, откуда я запускаю (UserControl)
public class ExecutionViewModel : BaseViewModel
{
#region Member Variables
/// <summary>
/// Logger
/// </summary>
private static readonly ILog log =
LogManager.GetLogger(typeof(ConfigurationViewModel));
#endregion
#region Properties
/// <summary>
/// Get/Set ExitCommand
/// </summary>
public ICommand ExitCommand { get; set; }
/// <summary>
/// Command To Launch Report a Problem
/// </summary>
public ICommand ReportAProblemView { get; set; }
/// <summary>
/// Command To Launch About
/// </summary>
public ICommand AboutView { get; set; }
/// <summary>
/// LaunchNavigationkeyViewCommamd
/// </summary>
public ICommand LaunchSelectionScreenCommamd { get; set; }
#endregion
# region Constructor
/// <summary>
/// Default Constructor
/// </summary>
public ExecutionViewModel()
{
ExitCommand = new RelayCommand(ExitFromApplication);
ReportAProblemView = new RelayCommand(LaunchReportAProblemView,
CanLaunchReportAProblemView);
AboutView = new RelayCommand(LaunchAboutView, CanLaunchAboutView);
LaunchNavigationkeyViewCommamd = new RelayCommand(LaunchNavigationkeyView);
LaunchSelectionScreenCommamd =
new RelayCommand(LaunchSelectionScreenView);
LaunchMenuConfigViewCommamd = new RelayCommand(LaunchMenuConfigView);
Messenger.UnRegister(this);
Messenger.Register(this);
UpdateStatusBar();
//Here i am Trying to perfrom Somecheck and Launch View if Needed
InitiateStartUpValidations();
}
Private void InitiateStartUpValidations()
{
if (Utility.IsStringNullOrEmpty(DOEConfigFileName))
{
PasswordViewModel passwordViewModel = new PasswordViewModel(FileDialogModes.Open) { ShowPasswordBox = false };
// Launching View using Messenger
// This Gives an error
Messenger.NotifyColleagues(MessengerMessages.LAUNCH_FILE_SELECT_VIEW, passwordViewModel);
}
}
/// <summary>
/// LaunchMenuConfigView
/// </summary>
/// <param name="obj"></param>
private void LaunchMenuConfigView(object obj)
{
log.Debug("LaunchMenuConfigView" + BaseModel.FUNCTION_ENTERED_LOG);
MenuConfigViewModel menuConfigViewModel =
new MenuConfigViewModel();
Messenger.NotifyColleagues(MessengerMessages.LAUNCH_VIEW_MENU_CONFIG, menuConfigViewModel);
log.Debug("LaunchMenuConfigView" + BaseModel.FUNCTION_EXIT_LOG);
}
/// <summary>
/// LaunchSelectionScreenView
/// </summary>
/// <param name="obj"></param>
private void LaunchSelectionScreenView(object obj)
{
log.Debug("LaunchSelectionScreenView" + BaseModel.FUNCTION_ENTERED_LOG);
SelectionScreenViewModel selectionScreenViewModel =
new SelectionScreenViewModel();
Messenger.NotifyColleagues(MessengerMessages.LAUNCH_SELECTIONSCREEN_VIEW, selectionScreenViewModel);
log.Debug("LaunchSelectionScreenView" + BaseModel.FUNCTION_EXIT_LOG);
}
# endregion
# region Private Methods
/// <summary>
/// CanLaunchSelectPageDefinitionView
/// </summary>
/// <param name="obj"></param>
private void CanLaunchSelectPageDefinitionView(object obj)
{
}
/// <summary>
/// LaunchNavigationkeyView
/// </summary>
private void LaunchNavigationkeyView(object obj)
{
log.Debug("LaunchNavigationkeyView" + BaseModel.FUNCTION_ENTERED_LOG);
UtilityViewModel utilityViewModel = new UtilityViewModel();
Messenger.NotifyColleagues(MessengerMessages.LAUNCH_VIEW_NAVIGATIONKEY, utilityViewModel);
log.Debug("LaunchNavigationkeyView" + BaseModel.FUNCTION_EXIT_LOG);
}
/// <summary>
/// Update the progressbar status message
/// </summary>
private void UpdateStatusBar()
{
log.Debug("UpdateStatusBar" + BaseModel.FUNCTION_ENTERED_LOG);
UpdateProgressbarStatus(string.Empty, false);
log.Debug("UpdateStatusBar" + BaseModel.FUNCTION_EXIT_LOG);
}
/// <summary>
/// CanLaunchAboutView
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
private bool CanLaunchAboutView(object obj)
{
return true;
}
/// <summary>
/// LaunchAboutView
/// </summary>
/// <param name="obj"></param>
private void LaunchAboutView(object obj)
{
Messenger.NotifyColleagues(MessengerMessages.LAUNCH_ABOUT_VIEW, "About View");
}
/// <summary>
/// CanLaunchReportAProblemView
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
private bool CanLaunchReportAProblemView(object obj)
{
return true;
}
/// <summary>
/// LaunchReportAProblemView
/// </summary>
/// <param name="obj"></param>
private void LaunchReportAProblemView(object obj)
{
Messenger.NotifyColleagues(MessengerMessages.LAUNCH_REPORT_A_PROBLEM_VIEW, "Report A Problem");
}
/// <summary>
/// </summary>
/// <param name = "obj"></param>
private void ExitFromApplication(object obj)
{
log.Debug(BaseModel.FUNCTION_ENTERED_LOG);
Messenger.NotifyColleagues(MessengerMessages.EXIT_APPLICATION, obj);
log.Debug(BaseModel.FUNCTION_EXIT_LOG);
}
# endregion
}
Кодирование моего MainView (где зарегистрированы все виды)
#region class - MainView
/// <summary>
/// Interaction logic for MainView.xaml
/// </summary>
public partial class MainView : BaseWindowClass
{
# region Member Variables
/// <summary>
/// log
/// </summary>
private static readonly ILog log = LogManager.GetLogger(typeof(MainView));
public readonly MainViewModel mainViewModel;
# endregion
# region Constructor
/// <summary>
/// Default Constuctor
/// </summary>
public MainView()
{
InitializeComponent();
mainViewModel = new MainViewModel();
mainViewModel.Messenger.UnRegister(this);
mainViewModel.Messenger.Register(this);
this.DataContext = mainViewModel;
}
# endregion
# region Protected Methods
/// <summary>
/// LaunchMenuConfigView
/// </summary>
/// <param name="menuConfigViewModel"></param>
[MessengerMessageSink(MessengerMessages.LAUNCH_VIEW_MENU_CONFIG, ParameterType = typeof(MenuConfigViewModel))]
protected void LaunchMenuConfigView(MenuConfigViewModel menuConfigViewModel)
{
log.Debug("LaunchMenuConfigView" + Utility.FUNCTION_ENTERED_LOG);
var menuConfigView = new MenuConfigView()
{
DataContext = menuConfigViewModel,
Owner =GetWindow(this),
};
menuConfigView.ShowDialog();
log.Debug("LaunchMenuConfigView" + Utility.FUNCTION_EXIT_LOG);
}
/// <summary>
/// LaunchNavigationKeyDetailsView
/// </summary>
/// <param name="obj"></param>
[MessengerMessageSink(MessengerMessages.LAUNCH_VIEW_NAVIGATIONKEY, ParameterType = typeof(UtilityViewModel))]
protected void LaunchNavigationKeyDetailsView(UtilityViewModel utilityViewModel)
{
log.Debug("LaunchNavigationKeyDetailsView" + Utility.FUNCTION_ENTERED_LOG);
var navigationScreen = new NavigationKeyDetailsView() {DataContext=utilityViewModel,Owner=GetWindow(this) };
navigationScreen.ShowDialog();
log.Debug("LaunchNavigationKeyDetailsView" + Utility.FUNCTION_EXIT_LOG);
}
/// <summary>
/// ReportProblemMenuItem_Click
/// </summary>
/// <param name="obj"></param>
[MessengerMessageSink(MessengerMessages.LAUNCH_ABOUT_VIEW,ParameterType=typeof(string))]
protected void LaunchABoutView(string obj)
{
log.Debug("LaunchABoutView" + Utility.FUNCTION_ENTERED_LOG);
var aboutScreen = new AboutDialog(Utility.TOOL_NAME,
Utility.TOOL_VERSION);
aboutScreen.ShowDialog();
log.Debug("LaunchABoutView" + Utility.FUNCTION_EXIT_LOG);
}
/// <summary>
/// ReportProblemMenuItem_Click
/// </summary>
/// <param name="obj"></param>
[MessengerMessageSink(MessengerMessages.LAUNCH_REPORT_A_PROBLEM_VIEW, ParameterType = typeof(string))]
protected void LaunchReportProblemView(string obj)
{
log.Debug("LaunchReportProblemView" + Utility.FUNCTION_ENTERED_LOG);
ReportProblemView objReportProblemView = new ReportProblemView
{
Owner = GetWindow(this)
};
objReportProblemView.ShowDialog();
log.Debug("LaunchReportProblemView" + Utility.FUNCTION_EXIT_LOG);
}
/// <summary>
/// FileSelectView
/// </summary>
/// <param name="passwordViewModel">ViewModel Instance of <c>PasswordView</c></param>
[MessengerMessageSink(MessengerMessages.LAUNCH_FILE_SELECT_VIEW,ParameterType=typeof(PasswordViewModel))]
protected void LaunchFileSelectView(PasswordViewModel passwordViewModel)
{
log.Debug("LaunchFileSelectView" + Utility.FUNCTION_ENTERED_LOG);
PasswordView passwordView = new PasswordView
{
DataContext = passwordViewModel,
Owner = GetWindow(this)
};
passwordView.ShowDialog();
log.Debug("LaunchFileSelectView" + Utility.FUNCTION_EXIT_LOG);
}
/// <summary>
/// Launch Ask Password
/// </summary>
/// <param name="changePasswordViewModel"></param>
[MessengerMessageSink(MessengerMessages.ASKFORPASSWORD, ParameterType = typeof(ChangePasswordViewModel))]
protected void LaunchAskPasswordView(ChangePasswordViewModel changePasswordViewModel)
{
log.Debug("LaunchChangePasswordView" + Utility.FUNCTION_ENTERED_LOG);
ChangePasswordView objChangePasswordView = new ChangePasswordView
{
DataContext =
changePasswordViewModel,
Owner = GetWindow(
this)
};
objChangePasswordView.ShowDialog();
log.Debug("LaunchChangePasswordView" + Utility.FUNCTION_EXIT_LOG);
}
/// <summary>
///
/// </summary>
/// <param name="selectionScreenViewModel"></param>
[MessengerMessageSink(MessengerMessages.LAUNCH_SELECTIONSCREEN_VIEW, ParameterType = typeof(SelectionScreenViewModel))]
protected void LaunchSelectionScreen(SelectionScreenViewModel selectionScreenViewModel)
{
SelectionScreenView selectionScreenView =
new SelectionScreenView
{
DataContext =
selectionScreenViewModel,
Owner =
GetWindow(this)
};
selectionScreenView.ShowDialog();
}
# endregion
# region Public Methods
/// <summary>
/// Exit Application
/// </summary>
/// <param name="obj"></param>
[MessengerMessageSink(MessengerMessages.EXIT_APPLICATION,ParameterType=typeof(object))]
public void ExitApplication(object obj)
{
this.Close();
}
#endregion
}
#endregion
Запуск Views работает отлично (как запуск с помощью нажатия кнопки), но он не работает, когда я пытаюсь запустить его при загрузке ExecutionView.
Я полностью застрял .... ничего не работает, я даже пытался использовать диспетчер, но все та же ошибка .......
Что я пытаюсь сделать здесь, это когда я запускаю свое приложение ExecutionView загружается в моем главном представлении ... в ExecutionViewModel Я выполняю некоторые проверки для запуска другого окна, но я чувствую, что мое представление выполнения еще не загружено так что это дает эту проблему .... но как ее решить ...
Спасибо за помощь .... заранее:)
Трассировка стека
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Window.ShowHelper(Object booleanBox)
at System.Windows.Window.Show()
at System.Windows.Window.ShowDialog()
at MyMenuTool.ViewLayer.MainView.LaunchFileSelectView(PasswordViewModel passwordViewModel) in C:\AD\MyMenuTool\Code\Working\MyMenu_VS2010\MyMenu\MyMenu\MainView.xaml.cs:line 134