ComboBox with SelectedValuePath and DisplayMemberPath does not show initial value

Question

I am trying to display items in a WinUI 3 ComboBox using SelectedValuePath and DisplayMemberPath. However, the ComboBox does not show the initial selected value.

<ComboBox
        x:Name="MyComboBox"
        ItemsSource="{x:Bind Items, Mode=OneWay}"
        SelectedValuePath="Model"
        DisplayMemberPath="Name"/>

public enum ModelEnum
{
    AAA = 0,
    BBB = 10,
    CCC = 100
}

public class AlphItem
{
    public ModelEnum Model { get; set; }
    public String Name { get; set; } = String.Empty;
}

public sealed partial class MainWindow : Window
{
    public List<AlphItem> Items { get; } =
    [
        new() { Name = "AAA", Model = ModelEnum.AAA },
        new() { Name = "BBB", Model = ModelEnum.BBB },
        new() { Name = "CCC", Model = ModelEnum.CCC }
    ];

    public MainWindow()
    {
        InitializeComponent();

        MyComboBox.SelectedValue = ModelEnum.AAA; // Initial value
    }
}

Akilan · Accepted Answer · 2025-09-17 06:14:21Z

2

The issue here is you have assigned the SelectedValue, Instead try assigning the SelectedItem.
Also, while assigning the selected item assign it through the list (i.e, Itemsource).

MyComboBox.SelectedItem = Items.FirstOrDefault(i => i.Model == ModelEnum.AAA);

edited Sep 17 at 6:14

answered Sep 17 at 6:08

Akilan

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1 Comment

kinton Sep 17 at 7:04

It worked! Thank you.

Andrew KeepCoding · Accepted Answer · 2025-09-17 06:33:52Z

1

It looks like you are hitting this know issue, which doesn't let you use enum for the SelectedValue.

Unfortunately, AFAIK, there's no good workaround using the SelectedValuePath. You just need to use SelectedIndex or SelectedItem.

Also, instead of setting the initial value on the constructor, set it on the Loaded event. The value is not rendered as the initial value on my end if I set it on the constructor.

private void MyComboBox_Loaded(object sender, RoutedEventArgs e)
{
    if (sender is not ComboBox comboBox ||
        comboBox.Items.FirstOrDefault(item => (item as AlphItem)?.Model == ModelEnum.BBB) is not AlphItem initialItem)
        return;

    comboBox.SelectedItem = initialItem;
}

answered Sep 17 at 6:33

Andrew KeepCoding

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1 Comment

kinton Sep 17 at 7:02

So it was a known issue, thank you. When I used the bound variable items in the constructor, it worked fine. It seems that using comboBox.Items doesn’t work.

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