为什么 UserControl 不使用绑定和 x:Name？

Question

我想使用 UserControl，例如 ContentControl。

例如，如果 CheckButton Check，则更改 Button 的 isEnalbe 属性。

但是，不要执行。

为什么??????

显示附加代码！

== Window.xaml ==

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfApplication4" x:Class="WpfApplication4.MainWindow"
        Title="MainWindow" Height="350" Width="525">
  <Grid>
    <local:UserControl1 >
      <local:UserControl1.Buttons>
        <Button IsEnabled="{Binding Path=IsChecked, ElementName=CheckBox}" Height="50"/>
        <Button Height="50"/>
      </local:UserControl1.Buttons>
    </local:UserControl1>
    <CheckBox x:Name="CheckBox"/>
  </Grid>
</Window>

== UserControl.xaml ==

<UserControl x:Class="WpfApplication4.UserControl1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
  <StackPanel x:Name="MainStack">
  </StackPanel>
</UserControl>

== UserControl.xaml.cs ==

public partial class UserControl1 : UserControl
    {
        public ObservableCollection<Button> Buttons
        {
            get { return (ObservableCollection<Button>)GetValue(ButtonsProperty); }
            set { SetValue(ButtonsProperty, value); }
        }

        public static readonly DependencyProperty ButtonsProperty =
            DependencyProperty.Register("Buttons", typeof(ObservableCollection<Button>), typeof(UserControl1), new PropertyMetadata(
                (depObj, args) =>
                {
                    var dep = depObj as UserControl1;
                    var newItem = args.NewValue as ObservableCollection<Button>;
                    newItem.CollectionChanged += dep.ButtonsOnCollectionChanged;
                }));

        private void ButtonsOnCollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs args)
        {
            switch (args.Action)
            {
                case NotifyCollectionChangedAction.Add:
                    foreach (var newItem in args.NewItems)
                    {
                        var input = newItem as Button;
                        MainStack.Children.Add(input);
                    }
                    break;
                case NotifyCollectionChangedAction.Reset:
                    MainStack.Children.Clear();
                    break;
            }
        }

        public UserControl1()
        {
            Buttons = new ObservableCollection<Button>();
            InitializeComponent();
        }
    }

Answer 1

您的 Button 嵌套在自定义控件中，无法直接访问 CheckBox。将属性添加到 CheckBox 绑定其 IsChecked 属性

   <CheckBox x:Name="CheckBox" IsChecked="{Binding IsChecked}"/>

然后可以如下引用CheckBox的DataContext

  <Button IsEnabled="{Binding RelativeSource={RelativeSource AncestorType=Grid} Path=DataContext.IsChecked}" Height="50"/>

为什么 UserControl 不使用绑定和 x:Name？

why UserControl don't use binding and x:Name?

c#

wpf

binding