使用组合框出现另一个组合框C＃

Question

我想这样做的原因是，一旦我选择first_ComboBox的第一项（ Student Information ）想要出现second_ComboBox 。

我怎样才能做到这一点

在cs代码中

private void first_ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {

    }

    private void second_ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {

    }

在XAML中

<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

在您的窗体主体上，可以将“第二个组合框”的可见性设置为false，然后在将第一个组合框选择更改为“ true”时，将其设置为true。

  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

在初始化时隐藏第二个组合框可见性

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

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