Question

我的xaml上有三个组合框，我首先在页面加载时加载，其余的将在click事件上加载：现在我有DropDownOpened事件，它应该加载组合并保持打开以供用户使用选择，但是它会按照命令来指定项目来源，然后逐步退出

<Window x:Class="test_combo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <ComboBox Name="cbo1" Margin="40,37,328,250"  SelectionChanged="OnComboBoxChanged" />
        <ComboBox Name="cbo2" Margin="40,145,328,142" DropDownOpened="cbo2_DropDownOpened" />
        <ComboBox Name="cbo3" Margin="40,91,328,196" />
    </Grid>
</Window>

C＃代码：

public partial class MainWindow : Window
{
     private List<string> comboList = new List<string>();
     string[] defaultParam =  { City , State ,zip} 

 public MainWindow()
        {
            InitializeComponent();

            foreach(string s in defaultParam)
            {
                LoadCombo(s);
            }

        }


        public void LoadCombo(string name)
        {           
            comboList.Add(name);
            cbo1.ItemsSource = comboList;         
        }


        private void OnComboBoxChanged(object sender,SelectionChangedEventArgs e)
        {
            string itemSel = (sender as ComboBox).SelectedItem.ToString();
            comboList.Remove(itemSel);
            MessageBox.Show(itemSel);

        }

        void cbo2_DropDownOpened(object sender, EventArgs e)
        {
            cbo2.ItemsSource = comboList;
        }
    }

Answer 1

它应该保持打开状态，但如果它没有，那么你可以通过使用

强行打开它

 cbo2.IsDropDownOpen = true

wpf combobox dropdownopened

1 个答案: