combobox 默认展开 wpf

    <ComboBox                                                   

                                                        x:Name="cmb" 

                                                        Height="50"

                                                        HorizontalContentAlignment="Stretch" 

                                                        Margin="2" 

                                                        IsDropDownOpen="True"

                                                                                                     

                                                        Visibility="Visible"

                                                        AllowDrop="True" IsTabStop="False" />

             public MainPage() {

             InitializeComponent();

             List<string> cities = new List<string>();

             cities.Add("London");

             cities.Add("Londona");

             cities.Add("London5");

             cities.Add("Seattle");

             cities.Add("Tokyo");

             cities.Add("Nairobi");

             cities.Add("Lisbon");

             cities.Add("New York");

             cities.Add("Paris");

             cities.Add("Ame");

             cities.Add("Acns");



            

             cmb.ItemsSource = cities;

             cmb.IsDropDownOpen = true;

             

        

        } 



   

   

补充：.NET技术 ,  ASP.NET

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