How to use update source trigger for Wpf Combobox, which is editable?

Question

I have a combo box (in my application wpf-mvvm). I set IsEditable = true . But the “property changed event” gets fired when I start typing.

How can I set UpdateSourceTrigger = Propertychanged here?

Also .. I need to call the check function if the user has entered a new value (I mean, except for those that are available in the list using the editing functions).

Any help would be appreciated.

  <ComboBox ItemsSource="{Binding Path = PlanTypeBasedContractNumberList }" Width="90" IsEditable="True" SelectedValue="{Binding GeneralCharacteristicsDataContext.ContractNumber.Value}"> </ComboBox> 

Answer 1

In an editable ComboBox SelectedItem and SelectedValue properties refer to Popup elements, not to an editable element. After you start typing, SelectedItem will become "unselected" and why the event occurs.

To bind a TextBox value to a ComboBox , use the Text property:

 <ComboBox IsEditable="True" Text="{Binding Path=..., UpdateSourceTrigger=...}">