I have a WPF ComboBox in my XAML file. And I want to Force the ComboBox to show its list items when I press F5. For this requirement, we have a property ‘IsDropDownOpen’ of ComboBox, which I set to True.
cmbCountry.IsDropDownOpen = true;
<Window x:Class="ComboBoxDemo.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="ComboBoxF5Demo" Height="350" Width="425" Background="#98dafc"> <StackPanel> <TextBlock Text="Press F5 to Open DropDown List" FontSize="20" Margin="20" HorizontalAlignment="Center" /> <ComboBox x:Name="cmbCountry" HorizontalAlignment="Left" IsEditable="True" Margin="110,30,0,0" SelectedIndex="0" VerticalAlignment="Top" Height="40" FontSize="20" Width="200"> <ComboBoxItem Content="--Select--" /> <ComboBoxItem Content="India" /> <ComboBoxItem Content="US" /> <ComboBoxItem Content="France" /> <ComboBoxItem Content="SwitzerLand" /> </ComboBox> </StackPanel> </Window>
using System.Windows; using System.Windows.Input; namespace ComboBoxDemo { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); cmbCountry.KeyDown += cmbCountry_KeyDown; } /// <summary> /// Occurs when a key is pressed while focus is on this element. /// </summary> /// <param name="sender"></param> /// <param name="e"></param> void cmbCountry_KeyDown(object sender, KeyEventArgs e) { if (e.Key == Key.F5) cmbCountry.IsDropDownOpen = true; } } }