WPF Combobox Autocomplete TextSearch like "Contains" instead of "Start with"

Question

I am trying to implement WPF Combobox Autocomplete TextSearch like "Contains" instead of "Start with".

Couple of question threads are there but could not find any concrete solution.

I was following the answer by @Evgenii: WPF combobox textsearch with contains

In the SetText(DependencyObject element, string text) method, the value of "text" parameter is always a "DeviceNumber" string. So my text is not reflecting there.

Here is my own sample code https://drive.google.com/open?id=1eqK5bh5SQJPxHeb-zzOuBHIpYapv-h18

Any reason?

Is anyone successfully implemented Text Search with Contains? Please guide.

I thank you for every answer I get but working code is much appreciable :)

Answer 1

make custom combobox control.

public class SearchComboBox : ComboBox
{
    TextBox editableTextBox;

    public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();

        editableTextBox = GetTemplateChild("PART_EditableTextBox") as TextBox;

        editableTextBox.TextChanged += EditableTextBox_TextChanged;
    }

    private void EditableTextBox_TextChanged(object sender, TextChangedEventArgs e)
    {
        ICollectionView ICV = ItemsSource as ICollectionView;

        if(ICV != null)
        {
            if (string.IsNullOrEmpty(editableTextBox.Text.Trim()))
                ICV.Filter = null;
            else
                ICV.Filter = new Predicate<object>(i => ((Equipment)i).equipmentLabel.Contains(editableTextBox.Text));

            IsDropDownOpen = true;
        }

    }
}

modify you EquipmentScreenViewModel Code. add ICollectionView type property

public  class EquipmentScreenViewModel
{
    public string SelectedEquipmentRego { get; set; }
    public ObservableCollection<Equipment> AllEquipments { get; set; }

    private ICollectionView _allEquipCollection = null;

    public ICollectionView AllEquipCollection
    {
        get
        {
            if (_allEquipCollection == null && AllEquipments != null)
            {
                _allEquipCollection = CollectionViewSource.GetDefaultView(AllEquipments);
            }

            return _allEquipCollection;
        }
    }
}

XAML

<Grid>
    <local:SearchComboBox x:Name="cmbAlternativeAsset" 
                            Width="200" IsEditable="True" 
                            FontSize="12" Foreground="#494949"
                            VerticalAlignment="Center"
                            HorizontalAlignment="Stretch"   
                            SelectedItem="{Binding SelectedEquipmentRego, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
                            ItemsSource="{Binding AllEquipCollection}" SelectedValuePath="equipmentRego"
                            DisplayMemberPath="equipmentLabel" IsTextSearchEnabled="False"
        />
</Grid>

Binding ItemsSource to CollectionView and IsTextSearchEnabled false. Good Luck