Interaction and communication between C# classes

I have an API service class that implements HttpClient to connect to my API, I have a user list model, and I have a View Model using the Community Toolkit MVVM approach. I would like to understand how these three components are related and how to connect them so that my View can receive data.

In the API service class, I specified the following:

    public class ApiServiceListUser
    {

        private static  HttpClient client;

        private static  JsonSerializerOptions options;

        public List<Meetman>? Meetmans { get; set; }

        public ApiServiceListUser()
        {
           
            client = new HttpClient();

            options = new JsonSerializerOptions()
            {
                PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
                WriteIndented = true,
            };
        }

       public async Task<List<Meetman>> RefreshDataAsync()
        {
            Meetmans = [];

            Uri uri = new("http://10.0.2.2:5000/api/meetman/getall");

            try
            {
                HttpResponseMessage response = await client.GetAsync(uri);

                if (response.IsSuccessStatusCode)
                {
                    string content = await response.Content.ReadAsStringAsync();
                    Meetmans = JsonSerializer.Deserialize<List<Meetman>>(content, options);
                }

            }
            catch (Exception ex)
            {
                Debug.WriteLine(@"\tERROR {0}", ex.Message);
            }

            return Meetmans;
        }
    }
}

In my View Model, I specified:

public partial class VMMeetman : ObservableObject
{
    private readonly ApiServiceListUser client;

    public VMMeetman()
    {
        ApiServiceListUser api = new();
        meetmans = [];

    }
  
    [ObservableProperty]
    private  ObservableCollection<Meetman> meetmans;

    [ObservableProperty]
    private int _meetmanId;

    [ObservableProperty]
    private string _iname;

    [ObservableProperty]
    private string _sname;

    [ObservableProperty]
    private string _tname;

    [ObservableProperty]
    private string _location;

I expected my API to pass data to my Meetman model, then I called the observable collection of user list in my View Model and I think it received it, then I registered my View Model as a service and declared it on my page where the Carousel View control is located, and I specified the binding to Meetmans from my View Model. I expected my Carousel View control to receive a list of users from my database through my API, but it doesn't happen.

Where am I wrong and what is the correct approach? My API is tested for requests and returns lists and (or) makes a database entry, so there are no errors on the backend side.

Following on from my comments

It seems you get the API data but do nothing... from the code I see, so this is one solution for you.

There will be better solutions, depending on the bigger picture, i would recommend setting your service up as dependency injection. Hopefully this points you in the right direction

So on your PageModel, when you want to use this, you just need to do something like this

VMMeetman meetman = New VMMeetman() // Auto populates with the api data

public partial class VMMeetman : ObservableObject
{
    private readonly ApiServiceListUser api;
    
    public VMMeetman()
    {
        api = new ApiServiceListUser();
        meetmans = new ObservableCollection<Meetman>();        
        
        LoadData();
    }
  
    [ObservableProperty]
    private ObservableCollection<Meetman> meetmans;
    
    // I think you need something like this...
    private async void LoadData()
    {
        var data = await api.RefreshDataAsync();
        
        if (data != null)
        {
            foreach (var meetman in data)
            {
                Meetmans.Add(meetman);
            }
        }
    }
}

This is not intended to be the best answer just a guide*