How to use ComboBox ?

[NilkOne]

Hello,

I can't init ComboBox values, and set SelectedValue by two way
Nothing appear or refresh at UI

Wha'ts the problem of this code ?

<ComboBox ItemsSource="{Binding Countries}"
                     SelectedItem="{Binding SelectedCountry, Mode=TwoWay}"/>

<Button Content="Select Germany"
              Command="{Binding SelectGermanyCommand}"/>

<TextBlock Text="{Binding SelectedCountry}"/>



public partial class MainModel : ObservableObject
{
    public string Title { get; } = "Test ComboBox";
    
    [ObservableProperty]
    private ObservableCollection<string> countries = new();

    [ObservableProperty]
    private string? selectedCountry;

    public LoginModel()
    {
        // Init data
        _ = LoadCountriesAsync();
    }

    private async Task LoadCountriesAsync()
    {
        await Task.Delay(500);

        Countries = new ObservableCollection<string>
        {
            "France",
            "Germany",
            "Italy",
            "Spain",
        };

        if (Countries.Count > 0)
            SelectedCountry = Countries[0];
    }

    [RelayCommand]
    private void SelectGermany()
    {
        if (Countries.Contains("Germany"))
            SelectedCountry = "Germany";
    }
}

Thanks in advance

[jeromelaban]

Thanks for the question! I took your example sample, and it's working for me.

21433-UnoApp1.zip

In general, when posting a question, it's best to provide a fully formed sample that reproduces the issue.