/// <summary>
/// Активирует модель представления.
/// </summary>
public override async void Activate(NavigationMode mode = NavigationMode.New)
{
Messages = new MessagesCollection(ContentState.Loading);
RaisePropertyChanged(() => Messages);
IDialog dialog = null;
try
{
dialog = await ServiceLocator.Current.GetInstance <IMessagesCacheService>()
.GetConversation((long)UserID) as IDialog;
}
catch (Exception) { }
if (dialog == null)
{
try
{
dialog = await ServiceLocator.Current.GetInstance <IConversationsService>()
.GetDialog(UserID);
}
catch (Exception ex)
{
Messages = new MessagesCollection(ContentState.Error);
Messages.LoadCommand = new RelayCommand(() => Activate());
RaisePropertyChanged(() => Messages);
SendMessageCommand.RaiseCanExecuteChanged();
throw ex;
}
}
Conversation = dialog;
Messages = dialog.Messages;
RaisePropertyChanged(() => Messages);
SendMessageCommand.RaiseCanExecuteChanged();
}
void Message_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
SendMessageCommand.RaiseCanExecuteChanged();
}