public async void Connect() { await chatHubService.ConnectAsync(); if (chatHubService.Connection.State == Microsoft.AspNet.SignalR.Client.ConnectionState.Connected) { ApiClientService apiClientService = new ApiClientService(); await apiClientService.PostMe(); Conversations = new ObservableCollection <Conversation>(DataContext.Instance.Conversations); OnPropertyChanged(nameof(Conversations)); } else { MessageBox.Show("Es konnte keine Verbindung zum ChatHub aufgebaut werden."); } }