WPF Combobox loses Text after Selection

I would like to have a searchable combobox. When I type something into it, the itemlist gets filtered. OnTextChanged does this quite fine. The second part is, inside the comboboxlist all the items are displayed with their shortdescription, but when I select an item, I want the key to be displayed. On SelectionChanged should do that, but everytime I select an item, the combobox input field gets overwritten with "".

private void OnTextChanged(object sender, TextChangedEventArgs e) { ItemSource = new ObservableCollection<RoleKeyElementVM>(DataSource.Where(x => x.ShortDescription.Contains(RoleKeyCombobox.Text) || x.Key.ToString() == RoleKeyCombobox.Text)); RoleKeyCombobox.ItemsSource = ItemSource; } private void OnSelectionChanged(object sender, EventArgs e) { RoleKeyElementVM SelectedItem = RoleKeyCombobox.SelectedItem as RoleKeyElementVM; if(SelectedItem != null) RoleKeyCombobox.Text = SelectedItem.Key.ToString(); }

The selection should look like this: <img src=https://www.e-learn.cn/content/wangluowenzhang/"https://i.stack.imgur.com/s6JK0.jpg" alt="image1">

and the filtering like this

<img src=https://www.e-learn.cn/content/wangluowenzhang/"https://i.stack.imgur.com/l3GbB.jpg" alt="image2">

How can I prevent the combobox from overwriting my custom text with a ""?


The combobox we are talking about:

<ComboBox Name="RoleKeyCombobox" Margin="5" Grid.Column="2" Grid.Row="0" IsEditable="True" IsSynchronizedWithCurrentItem="False" TextBoxBase.TextChanged="OnTextChanged" SelectionChanged="OnSelectionChanged"> <ComboBox.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding ShortDescription}"/> </DataTemplate> </ComboBox.ItemTemplate> </ComboBox>


remove OnSelectionChanged

add the following to the RoleKeyElementVM

public override string ToString() { return this.Key; }



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