wpf 如何设置组合框项目的可见性？
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How to set combox item visibility?
提问by 0070
i have 2 WPF comboboxes(comboboxA, comboboxB)with identical combobox item(Apple & Orange). Let say i select "Apple" in the comboboxA, then the "Apple" need to be hidden in the comboxB. If i go back to comboxA and select "Orange", "Apple" will be visible and "Orange" need to be hidden. How can i achieve that using C#?
我有 2 个 WPF 组合框（comboboxA、comboboxB）和相同的组合框项目（Apple 和 Orange）。假设我在组合框 A 中选择“苹果”，那么“苹果”需要隐藏在组合框 B 中。如果我返回 comboxA 并选择“Orange”，“Apple”将可见，而“Orange”需要隐藏。我如何使用 C# 实现这一目标？
code snippet for xaml:
xaml 的代码片段：
<ComboBox Name="comboboxA" >
<ComboBoxItem Content="Apple" Name="AppleA"></ComboBoxItem>
<ComboBoxItem Content="Orange" Name="OrangeA"></ComboBoxItem>
</ComboBox>
<ComboBox Name="comboboxB" >
<ComboBoxItem Content="Apple" Name="AppleB"></ComboBoxItem>
<ComboBoxItem Content="Orange" Name="OrangeB"></ComboBoxItem>
</ComboBox>
采纳答案by Mark Hall
You can use the Method that sa_ddam213 mentioned, or you can just brute force it in the SelectionChanged Event like so.
您可以使用 sa_ddam213 提到的方法，或者您可以像这样在 SelectionChanged 事件中强制使用它。
private void comboboxA_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
for (int i = 0; i <= comboboxB.Items.Count -1; i++)
{
if (((ComboBoxItem)(comboboxB.Items[i])).Content.ToString() == ((ComboBoxItem)comboboxA.SelectedItem).Content.ToString())
{
((ComboBoxItem)(comboboxB.Items[i])).Visibility = System.Windows.Visibility.Collapsed;
}
else
((ComboBoxItem)(comboboxB.Items[i])).Visibility = System.Windows.Visibility.Visible;
}
}
回答by sa_ddam213
Maybe just filtering the selected item from list
也许只是从列表中过滤选定的项目
<Window x:Class="WpfApplication6.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" Name="UI">
<Grid>
<ComboBox ItemsSource="{Binding ElementName=UI,Path=YourCollection}" SelectedItem="{Binding ElementName=UI,Path=SelectedItem}" Height="23" HorizontalAlignment="Left" Margin="65,61,0,0" Name="comboBox1" VerticalAlignment="Top" Width="120" />
<ComboBox ItemsSource="{Binding ElementName=UI, Path=FilteredCollection}" Height="23" HorizontalAlignment="Left" Margin="223,61,0,0" Name="comboBox2" VerticalAlignment="Top" Width="120" />
</Grid>
</Window>
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window, INotifyPropertyChanged
{
private string _selectedItem;
private ObservableCollection<string> _yourCollection = new ObservableCollection<string>();
public MainWindow()
{
InitializeComponent();
YourCollection.Add("Apple");
YourCollection.Add("Banana");
YourCollection.Add("Pear");
YourCollection.Add("Orange");
NotifyPropertyChanged("FilteredCollection");
}
// Collection Fro ComboBox A
public ObservableCollection<string> YourCollection
{
get { return _yourCollection; }
set { _yourCollection = value; }
}
// ComboBox A selected Item
public string SelectedItem
{
get { return _selectedItem; }
set
{
_selectedItem = value;
// Notify the the filter collection has changed
NotifyPropertyChanged("FilteredCollection");
}
}
// Collection to show in ComboBox B
public List<string> FilteredCollection
{
// Remove the selected Item
get { return _yourCollection.Where(s => !s.Equals(_selectedItem)).ToList(); }
}
public event PropertyChangedEventHandler PropertyChanged;
public void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
}
Or do you need this to work both ways
或者你需要这个来双向工作
