绑定到用户控件中的dependencyproperty，并在嵌套属性更改时调用CanExecute

using System.Windows;
using System.Windows.Controls;

public class MyCustomControl : Control
{
    public static readonly DependencyProperty NestedPropertyProperty =
        DependencyProperty.Register("NestedProperty", typeof(string), typeof(MyCustomControl), new PropertyMetadata(OnNestedPropertyChanged));

    public string NestedProperty
    {
        get { return (string)GetValue(NestedPropertyProperty); }
        set { SetValue(NestedPropertyProperty, value); }
    }

    private static void OnNestedPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var control = d as MyCustomControl;
        if (control != null)
        {
            control.OnCanExecuteChanged();
        }
    }

    protected override bool CanExecuteCommand(CommandBinding binding, object target)
    {
        // 根据 NestedProperty 的值来决定是否执行命令
        return !string.IsNullOrEmpty(NestedProperty);
    }

    protected override void OnCanExecuteChanged()
    {
        base.OnCanExecuteChanged();
        // 触发命令的 CanExecuteChanged 事件
        CommandManager.InvalidateRequerySuggested();
    }
}