C#•11mo ago

✅ How to Retrieve the Selected Item Value from a ComboBox in C# (AvaloniaUI)

Hi, How can I get the value of the selected item in a ComboBox in C# (I'm using AvaloniaUI), please?

10 Replies

Is there a SelectedItem property?

This looks to be it, though it's a generic object? type so I'm not exactly sure what you want out of it. Are you looking to get the value of a specific field on the object or do you just need the object? https://reference.avaloniaui.net/api/Avalonia.Controls.Primitives/SelectingItemsControl/F3D6C726

AvaloniaUI

Avalonia - A multi-platform .NET UI framework

vanille.•11mo ago

There's also the SelectedIndex property that could help. https://reference.avaloniaui.net/api/Avalonia.Controls.Primitives/SelectingItemsControl/3725F15E

AvaloniaUI

Avalonia - A multi-platform .NET UI framework

Buddy•11mo ago

Prefer using MVVM And bind the SelectedItem to a property SelectedItem="{Binding MySelectedItem}" ⏫ Is how you bind it in XAML MySelectedItem is a property in the Viewmodel Viewmodel is the object instance in DataContext

M.OP•11mo ago

Yes

M.OP•11mo ago

Thanks, I'll look at it all Thank You, i succeeded. if it can help anyone, I did it like this:

c#
private ComboBox ComboBoxOutputFormat;


private void InitializeComponent()
    {
        AvaloniaXamlLoader.Load(this);
        ComboBoxOutputFormat = this.FindControl<ComboBox>("ComboBoxOutputFormat");
        ComboBoxOutputFormat.SelectionChanged += ComboBoxOutputFormat_SelectionChanged;
    }

    private void ComboBoxOutputFormat_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {

        string valeurSelectionnee = (ComboBoxOutputFormat.SelectedItem as ComboBoxItem)?.Content?.ToString();

        if (!string.IsNullOrEmpty(valeurSelectionnee))
        {
            Console.WriteLine($"Option sélectionnée : {valeurSelectionnee}");
        }
    }

c#
private ComboBox ComboBoxOutputFormat;


private void InitializeComponent()
    {
        AvaloniaXamlLoader.Load(this);
        ComboBoxOutputFormat = this.FindControl<ComboBox>("ComboBoxOutputFormat");
        ComboBoxOutputFormat.SelectionChanged += ComboBoxOutputFormat_SelectionChanged;
    }

    private void ComboBoxOutputFormat_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {

        string valeurSelectionnee = (ComboBoxOutputFormat.SelectedItem as ComboBoxItem)?.Content?.ToString();

        if (!string.IsNullOrEmpty(valeurSelectionnee))
        {
            Console.WriteLine($"Option sélectionnée : {valeurSelectionnee}");
        }
    }

Buddy•11mo ago

Please don't do this. Avoid code-behind and prefer MVVM. If you change the name on the control, you must also change name in code-behind. And if you forget to change code-behind it will error and throw an exception.

M.OP•11mo ago

Ok thank you and optimization level does it change anything?

Buddy•11mo ago

I don't know about the performance gain, but generally speaking it is way easier to work on the application and extend it since it follows a structure. Read more on how to get starged with MVVM here https://intellitect.com/blog/getting-started-model-view-viewmodel-mvvm-pattern-using-windows-presentation-framework-wpf/ AvaloniaUI is made similarly to WPF, so the XAML API generally remains the same except when it comes to styling. Avalonia also has a guide on MVVM https://docs.avaloniaui.net/docs/concepts/the-mvvm-pattern which I recommend more than the previous link

M.OP•11mo ago

thank you very much, I will take a look

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✅ How to Retrieve the Selected Item Value from a ComboBox in C# (AvaloniaUI)