Display Validation Errors on TextBox

[djhohnstein]

Hey everyone, new to Avalonia. Had a question about displaying validation errors and the MVVM toolkit.

I have the following ViewModel:

public class CustomViewModel : ViewModelBase {
    [ObservableProperty]
    [NotifyDataErrorInfo]
    [CustomValidation(typeof(SharedDefinitions), 
        nameof(SharedDefinitions.ValidateTextAlphaNumeric))]
    [Required]
    private string _name; 
...
}

Let's say I have the corresponding UserControl with the following defined:

<Grid RowDefinitions="*" ColumnDefinitions="Auto,*">
    <TextBlock
        VerticalAlignment="Center"
        FontSize="18"
        FontWeight="Bold"
        Margin="0 0 40 0"
        Grid.Row="0" Grid.Column="0" Text="Name:" />
    <TextBox 
        Grid.Row="0" Grid.Column="1" 
        assists:TextFieldAssist.Hints="{StaticResource AlphaNumericOnly}"
        Text="{Binding Name}" />
</Grid>

Upon the rendering of my view and entering of data into the TextBox element, I see that the outline of this box properly changes to red when a validation error occurs from the ValidateTextAlphaNumeric function (which returns a ValidationResult object), but the error message of that ValidationResult is not rendered on the corresponding TextBox hint. Is it possible to show the validation errors for that field on the text box?

[SKProCH]

Seems like this bug, since before it showns below the textbox. I'll take a look. You can track progress at #402

[djhohnstein]

Awesome thank you!