Question

I have to use a preview text input event that I have to apply to all the comboboxes in my application.

example

 private void cmbClass_PreviewTextInput(object sender, TextCompositionEventArgs e)
 {
    cmbClass.IsDropDownOpen = true;
 }

Is there anyway i can use a header(any possible way) so that i don’t have to type the preview text input in all of my comboboxes (98 in total)?

Answer 1

Create a style in app.xaml. This will be applied to all the comboboxes of your application but if you want this in comboboxes of a particular window then write it in the tag <Window.Resources>

<Application.Resources>
    <Style x:Key="key1" TargetType="ComboBox">
        <Setter Property="IsDropDownOpen" Value="True"/>
    </Style>
</Application.Resources>

or

<Window.Resources>
   ...
</Window.Resources>

or

you can assign a common event to all comboboxes. Write this code in your .cs file and select all comboboxes and assign this event to PreviewTextInput event.

private void cmboxes_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
    ((ComboBox)sender).IsDropDownOpen = true;
}