Data Annotation, Validation, EF Core and Property Changed possible issue.

[QJS-RH]

I am developing a very simple WPF app using MVVM, Data Annotation, EF Core and Community Toolkit.

Model is `[Table("Companies", Schema = "RHOKSAdmin")]
[Index(nameof(CompanyID), IsUnique = true)]
[Index(nameof(CompanyIdentifier), IsUnique = true)]
public partial class CompanyM : ObservableValidator
{
[Key]
[Column("CompanyID")]
[Comment("Unique Identifier for the Company")]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
[ObservableProperty]
private int? _companyID;

[Column("Identifier", TypeName = "varchar(20)")]
[Comment("Unique Identifier for the Company")]
[Unicode(false)]
[Display(Name = "Company Abbreviation")]
[Required(ErrorMessage = "Required")]
[StringLength(20, MinimumLength = 2, ErrorMessage = "Min 2, Max 20 characters.")]
[ObservableProperty]
[NotifyDataErrorInfo]
private string? _companyIdentifier;

[Column("Fullname", TypeName = "varchar(100)")]
[Comment("Full Name of the Company")]
[Unicode(false)]
[Display(Name = "Company Name")]
[Required(ErrorMessage = "Required")]
[StringLength(100, MinimumLength = 2, ErrorMessage = "Min 2, Max 100 characters.")]
[ObservableProperty]
[NotifyDataErrorInfo]
private string? _companyFullname;

// Public method to trigger validation
public void ValidateAllPropertiesPublic()
{
    ValidateAllProperties();
}`

ViewModel loding from EF is `public async Task LoadDataAsync()
{
try
{
AllCompanies?.Clear();
SelectedCompany = new CompanyM();
SelectedCompany.PropertyChanged += SelectedCompany_PropertyChanged;

    LoadingProgressBarVisible = true;
    if (AppSettingsM != null)
    {
        switch (AppSettingsM.GetRequiredSection("ConnectionType").Get<ConnectionType>())
        {
            case ConnectionType.Home:
                AllCompanies = [.. await _rhoksHomeSqlServerDBContext.Companies.ToListAsync()];
                break;
            case ConnectionType.Test:
                AllCompanies = [.. await _rhoksTestSqlServerDBContext.Companies.ToListAsync()];
                break;
            case ConnectionType.SqlLite:
                AllCompanies?.Clear();
                break;
            case ConnectionType.None:
                AllCompanies?.Clear();
                break;
        }
    }
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message, "Error Loading Company Data", MessageBoxButton.OK, MessageBoxImage.Error);
}
finally
{
    // Ensure event subscription and validation after setting SelectedCompany
    SelectedCompany = AllCompanies?.FirstOrDefault() ?? new CompanyM();
    ManualValidation();
    LoadingProgressBarVisible = false;
}

}`

Code for SelectedCompany is `private CompanyM? _selectedCompany;
public CompanyM? SelectedCompany
{
get => _selectedCompany;
set
{
if (_selectedCompany != null)
{
_selectedCompany.PropertyChanged -= SelectedCompany_PropertyChanged;
}

    SetProperty(ref _selectedCompany, value);

    if (_selectedCompany != null)
    {
        _selectedCompany.PropertyChanged += SelectedCompany_PropertyChanged;
        _selectedCompany.ValidateAllPropertiesPublic();
    }
}

}

private void SelectedCompany_PropertyChanged(object? sender, PropertyChangedEventArgs e)
{
// Debug statement to check if the event is firing
Console.WriteLine($"PropertyChanged event fired for property: {e.PropertyName}");

CanSaveCompany = SelectedCompany is not null && !SelectedCompany.HasErrors;
SaveVisibility = CanSaveCompany;

}`

My issue is whenever I assign a value to SelectedCompany using the statement SelectedCompany = AllCompanies?.FirstOrDefault() ?? new CompanyM();

I have to run ManualValidation() to get the Validated results via the public void ValidateAllPropertiesPublic() { ValidateAllProperties(); } part of the Model.

SO the validation is not running when doing a SelectedCompany = AllCompanies?.FirstOrDefault() ?? new CompanyM(); and also the `private void SelectedCompany_PropertyChanged(object? sender, PropertyChangedEventArgs e)
{
// Debug statement to check if the event is firing
Console.WriteLine($"PropertyChanged event fired for property: {e.PropertyName}");

CanSaveCompany = SelectedCompany is not null && !SelectedCompany.HasErrors;
SaveVisibility = CanSaveCompany;

}` doesn't run.

is this by design or am I missing something?

Thanks in advance for any information.