partial void OnXXXXXXChanged(string value) in viewmodel error

[Gimmy-Ateikon]

I state that I am a neophyte.
I am attempting to implement a class binding using the toolkit 8.0 in .Net Maui ; everything seems to work apart from generating 'partial void OnXXXXXXChanged(string value)'.
In the viewModel gives me this error:

Can someone help me ?

[Gimmy-Ateikon]

This is my viewModel

namespace Alina.ViewModel
{
    [INotifyPropertyChanged]
    public partial class BindingClassToolkitViewModel
    {

        public BindingClassToolkitViewModel()
        {
        }

        public ArticoloModel ArticoloModel { get; set; } = new ArticoloModel();

      
        [RelayCommand]
        public async Task AddArticolo()
        {
            // Add to database !
            ArticoloModel.ClearFields();
        }

// HERE I HAVE THE ERROR

        // Alla pressione di ogni tasto scatta l'evento.
        // esiste un evento per ogni pubblica variabile: OnXxxxxChanged
        partial void OnCodiceChanged(string value)
        {
            App.Current.MainPage.DisplayAlert("Changed", value, "OK");
        }

    }
}

[Gimmy-Ateikon]

My view

<ContentPage.BindingContext>
    <local:BindingClassToolkitViewModel/>
</ContentPage.BindingContext>

<ScrollView HorizontalOptions="CenterAndExpand">
    <VerticalStackLayout Padding="40" Spacing="10">

        <Label Text="Codice" />
        <Entry Text="{Binding ArticoloModel.Codice}" BackgroundColor="AliceBlue"  />
        <Label Text="Descrizione" />
        <Entry Text="{Binding ArticoloModel.Descrizione}"  BackgroundColor="AliceBlue"/>
        <Label Text="Tipo" />
        <Entry Text="{Binding ArticoloModel.Tipo}" BackgroundColor="AliceBlue" />
        <Label Text="{Binding ArticoloModel.FullArticle}" />

        <Button Text="Aggiungo Articolo" 
            Command="{Binding AddArticoloCommand }" 
            HorizontalOptions="Center"/>
    </VerticalStackLayout>
</ScrollView>

[Gimmy-Ateikon]

my model

using CommunityToolkit.Mvvm.ComponentModel;
using System.ComponentModel;

namespace Alina.Model

{
[INotifyPropertyChanged]
public partial class ArticoloModel
{

    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(FullArticle))]
    string codice ;

    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(FullArticle))]
    string descrizione;

    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(FullArticle))]
    string tipo;

    public string FullArticle => $"{Codice} - {Descrizione}";
    
    public void ClearFields()
    {
        Codice = string.Empty;
        Descrizione = string.Empty;
        Tipo = string.Empty;        }

}

}

[Sergio0694]

Ciao! The issue is that you simply don't have a generated "Codice" property there. The partial "On___Changed" methods are generated for properties you declare via [ObservableProperty], and you don't have such a property in BindingClassToolkitViewModel (you have one in ArticoloModel).

Also, just a side note: avoid using [INotifyPropertyChanged] if you can inherit from [ObservableObject] instead.

[Gimmy-Ateikon]

Hello.
Thank you for your reply.
The "codice", as you noticed, is in my model.
I deduce that, if I Binding a class and not properies in viewmodel I can not use automatic events?
How can I overcome this?
Thank you for your patience.

P.s.
Thanks for the suggestion about [INotifyPropertyChanged]/[ObservableObject]

P.p.s
Vedo che sei italiano. Qui è ammesso scrivere in italiano