当组框控件的IsEnabled状态被绑定到某个视图模型时,该控件的IsEnabled状态没有传播到子按钮

本文关键字:IsEnabled 状态 控件 按钮 传播 绑定 视图 模型 | 更新日期: 2023-09-27 18:14:15

Groupbox包含一个Grid,其中包含两个按钮。

希望代码能更好地表达它:

<Window x:Class="PanelTest.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="344" Width="361"
    x:Name="This">
<Grid>
    <GroupBox x:Name="_groupBox" IsEnabled="False" Header="GroupBox" HorizontalAlignment="Left" Margin="30,87,0,0" VerticalAlignment="Top" Height="206" Width="300">
        <Grid>
            <Button Content="Bound Button" IsEnabled="{Binding IsEnabled, Mode=TwoWay}" HorizontalAlignment="Left" Height="51" VerticalAlignment="Top" Width="128" Margin="140,75,0,0"/>
            <Button Content="Unbound Button" HorizontalAlignment="Left" Margin="10,75,0,0" VerticalAlignment="Top" Width="125" Height="51"/>
        </Grid>
    </GroupBox>
    <Button Content="Toggle Group Enabled" HorizontalAlignment="Left" Margin="93,29,0,0" VerticalAlignment="Top" Width="161" Click="EnableClick" Height="35"/>
</Grid>

public partial class MainWindow : Window {
    public MainWindow() {
        InitializeComponent();
        DataContext = new ButtonViewModel();
    }
    private void EnableClick(object sender, RoutedEventArgs e)
    {
        _groupBox.IsEnabled = !_groupBox.IsEnabled;
    }
}
public class ButtonViewModel : INotifyPropertyChanged {
    static ButtonViewModel() {
        eventArgCache = new Dictionary<string, PropertyChangedEventArgs>();
    }
    bool _enabled;
    public bool IsEnabled {
        get { return _enabled; }
        set {
            if (_enabled == value)
                return;
            _enabled = value;
            RaisePropertyChanged("IsEnabled");
        }
    }

…}

当我切换组框的启用状态时,我期望IsEnabled属性被设置,但它根本没有被调用,并且绑定的按钮也没有采用组框的启用状态。

是否有一种方法可以使(双向)绑定和亲子关系同时工作?

当组框控件的IsEnabled状态被绑定到某个视图模型时,该控件的IsEnabled状态没有传播到子按钮

使用this将button的属性绑定到groupbox的属性

<GroupBox x:Name="_groupBox" IsEnabled="False" Header="GroupBox" HorizontalAlignment="Left" Margin="30,87,0,0" VerticalAlignment="Top" Height="206" Width="300">
    <Grid>
        <Button Content="Bound Button" IsEnabled="{Binding IsEnabled, ElementName=_groupBox}" HorizontalAlignment="Left" Height="51" VerticalAlignment="Top" Width="128" Margin="140,75,0,0"/>
        <Button Content="Unbound Button" HorizontalAlignment="Left" Margin="10,75,0,0" VerticalAlignment="Top" Width="125" Height="51"/>
    </Grid>
</GroupBox>

注:IsEnabled="{Binding IsEnabled, ElementName=_groupBox}"

其次,没有已知的方法来绑定按钮的属性来匹配_groupBox &视图模型,当它们都不同时。例如_groupBox.IsEnabled is falseviewmodel.IsEnabled is true,但是计算属性可以帮助您执行这样的逻辑