ComboBox.Text can't select items in some cases

• .NET Core Version: All. Also
• Windows version: 7 and 10
• Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes

Problem description: When ComboBox.IsEditable = False, setting the ComboBox.Text to a text that matches an item in the ComboBox should select this item. This doesn’t happen in some cases, like setting the Text property to “Test” while the ComboBox contains the items "test", "Test", "abc" or "test1", "Test", "abc" or "Test1", "Test", "abc". It seems that matching Test to test, test1, “Test1” causes some error that apports the search (which doesn’t happen in WinForms by the way). That proves this submission, is that changing the order (ComboBox contains the items "Test", "test", "abc") will make the combobox select the item Test correctly!

Minimal repro:

    <StackPanel>
        <ComboBox x:Name="ComboBox1" IsEditable="False">
            <ComboBoxItem>test</ComboBoxItem>
            <ComboBoxItem>Test</ComboBoxItem>
            <ComboBoxItem>abc</ComboBoxItem>
        </ComboBox>
        <Button Click="Button_Click">Test</Button>
    </StackPanel>

    Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
        ComboBox1.Text = "Test"
    End Sub

Run the app and click the button. Nothing will be selected in the comboBox. Expected behavior is to select the Test item.

[miloush]

This is the way combobox works on winforms and how it should work in wpf not to break any ported code from winforms.

No. Winforms and WPF are fundamentally different frameworks and there should be no such expectations.

Expected behavior is to select the Test item.

The documentation (https://learn.microsoft.com/en-us/dotnet/api/system.windows.controls.combobox.text) says otherwise:

When IsEditable is false, setting this value has no effect.

Sounds like the current behavior is by design… To select an item, find the item you want and use the SelectedItem property.

[msftbot[bot]]

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