iDialog | Simple AngularJS dialog window module | Frontend Framework library

I have design a bot with form flow model. When I am executing it locally in bot emulator. It's throwing a error.

Exception: Operation returned an invalid status code ‘MethodNotAllowed’

The bot I'm developing is a replacement for a contact form for potential clients that want to be contacted by a company, so the user inputs have to be saved in a database. I have successfully connected a Cosmos DB to my bot which collect the state data when the bot is used. I have a dialog stack with one dialog per user input (Name, email and the message the user want to leave).

I can't find any helpful documentation on how to save conversation history for bots written in C#. Can anyone help me out? I'm still a beginner in Bot Framework and C#.

Here is my global.asax file:

I have declared a base dialog window class that types the datacontext to ensure that the attached viewmodel has the appropriate return type. When I try to use it though I get a generic arguments error:

GenericArguments[1], 'Mocks.MidSoft_Hospitality_ViewModels_Dialogs_ReceiveItemViewModel_32_569724456', on 'Mocks.MidSoft_Hospitality_Views_Dialogs_BaseDialogWindow`2_32_569724456[TResult,TViewModel]' violates the constraint of type 'TViewModel'.

I can't see why this would be happening

The base dialog window declaration:

I tried to pass concrete component to dialog:

I have a base class Dialog:

Qt: 5.9.8

Host: ubuntu 19.04

Compiler: arm-linux-gnueabi-gcc (Ubuntu/Linaro 8.3.0-6ubuntu1) 8.3.0

build command:

I am trying to add dependency injection in this class, but I am not sure if is possible.

I'm trying to use the MVVM pattern for the first time but I'm struggling with opening Views while keeping them decoupled from the View Models. I'm using a DialogService class (IDialog.cs below) which was part of an MVVM tutorial on YouTube. The DialogService works fine as long as it's being accessed from the MainWindow which has an instance of the DialogService.

The problem is that I need to open multiple TradeView from my TradeManagerViewModel which doesn't have an instance of DialogService. I can't create another instance of the DialogService because I would need to register all of the View/ViewModel mappings for every instance I create. I can't use the DialogService instance from my MainWindowViewModel because my TradeMangerViewModel doesn't have a reference to the instance of my MainWindowViewModel. In the main window view model I can't make public readonly IDialogService dialogService; static because then I can't assign the dialogService parameter passed in the MainWindowViewModel constructor.

The only other way I can think of is to create a separate singleton class which holds the instance of DialogService so the same instance can be accessed from both View Models (and future ones I've not yet written). But I've also read lots of different opinions about singleton classes and most of them suggesting that you shouldn't ever really need to use them. So I have I found an exception to that opinion? or is there another way I can/should go about this?

App.xaml.cs (Changes here were also taken from the YouTube video)

I am new to ChatBot developent , in all the tutorials I checked so far starts an example with template ChatBot Application, I do not see this in my visual studio 2017 community edition, I only see the following Templates , Am I missing something , if I use any of these templates I do not see any references to IDialog interfaces. Any leads would be of great help.Thanks

1. Microsoft Bot Builder V4 SDK
2. Echo Bot
3. Empty Bot