使用组合框出现另一个组合框C＃

Question

I want to make this as, once i select the first item( Student Information ) of the first_ComboBox want to appear second_ComboBox .

How can I make this happen

In the cs code

private void first_ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {

    }

    private void second_ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {

    }

in XAML

<StackPanel Margin="97,47,171,499" Orientation="Horizontal" Grid.Row="1">
        <TextBlock HorizontalAlignment="Left" TextWrapping="Wrap" Text="Where You want to Control" VerticalAlignment="Top" Height="82" Width="463" FontSize="36"/>
        <ComboBox x:Name="first_ComboBox" HorizontalAlignment="Left" VerticalAlignment="Top" Width="560" Height="42" SelectionChanged="first_ComboBox_SelectionChanged">
            <x:String>Student Information</x:String>
            <x:String>Staff Information</x:String>
            <x:String>Academic Information</x:String>
        </ComboBox>
    </StackPanel>
    <StackPanel Margin="97,172,171,374" Orientation="Horizontal" Grid.Row="1">
        <TextBlock HorizontalAlignment="Left" TextWrapping="Wrap" Text="Select the Field" VerticalAlignment="Top" Height="82" Width="463" FontSize="36"/>
        <ComboBox x:Name="second_ComboBox" HorizontalAlignment="Left" VerticalAlignment="Top" Width="560" Height="42" SelectionChanged="second_ComboBox_SelectionChanged">
            <x:String>Student Name</x:String>
            <x:String>Student Address</x:String>                      
        </ComboBox>
    </StackPanel>

Answer 1

On your Form main, you can set the visibility of Second Combobox to be false, and then on the first combobox selection changed set it to true, Something like this

  public MainWindow()
    {
        InitializeComponent();
        second_ComboBox.Visibility = Visibility.Collapsed;
    }

    private void first_ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        var selecteditem = first_ComboBox.SelectedItem as string;
        if (selecteditem != null)
        {
            second_ComboBox.Visibility = Visibility.Visible;
        }
    }

Answer 2

on initialization make second combobox visiblity hidden

    public MainWindow()
{
    InitializeComponent();
    second_ComboBox.Visibility = Visibility.Collapsed;
}

private void first_ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
       first_ComboBox.Visibility = System.Windows.Visibility.Visible;
}