c# – 如何绑定到WPF中动态创建的单选按钮？

创建另一个实现这些对象的可观察集合的类,称为Mutexes,并在每个对象上处理PropertyChanged – 例如有一个像这样的构造函数：

public MutexesViewModel(IEnumerable<MutexViewModel> mutexes)
{
   _Mutexes = new ObservableCollection<MutexViewModel>();
   foreach (MutexViewModel m in Mutexes)
   {
      _Mutexes.Add(m);
      m.PropertyChanged += MutexViewModel_PropertyChanged;
   }
}

和一个事件处理程序,确保在任何给定时间只有一个子对象的IsChecked设置为true：

private void MutexViewModel_PropertyChanged(object sender,PropertyChangedEventArgs e)
{
   MutexViewModel m = (MutexViewModel)sender;
   if (e.PropertyName != "IsChecked" || !m.IsChecked)
   {
     return;
   }
   foreach (MutexViewModel other in _Mutexes.Where(x: x != m))
   {
      other.IsChecked = false;
   }
}

您现在有一种机制可以创建任意数量的命名布尔属性,这些属性都是互斥的,即在任何给定时间只能有一个属性为真.

现在像这样创建XAML – 这个的DataContext是一个MutexesViewModel对象,但你也可以将ItemsSource绑定到类似{DynamicResource myMutexesViewModel.Mutexes}的东西.

<ItemsControl ItemsSource="{Binding Mutexes}">
   <ItemsControl.ItemTemplate>
      <DataTemplate DataType="local:MutexViewModel">
         <RadioButton Content="{Binding Text}" IsChecked="{Binding IsChecked,Mode=TwoWay}"/>
      </DataTemplate>
   </ItemsControl.ItemTemplate>
</ItemsControl>

编辑

我发布的XAML中存在语法错误,但没有什么可以让你完全停止.这些类有效：

public class MutexViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    public string Text { get; set; }

    private bool _IsChecked;

    public bool IsChecked
    {
        get { return _IsChecked; }
        set
        {
            if (value != _IsChecked)
            {
                _IsChecked = value;
                OnPropertyChanged("IsChecked");
            }
        }
    }

    private void OnPropertyChanged(string propertyName)
    {
        PropertyChangedEventHandler h = PropertyChanged;
        if (h != null)
        {
            h(this,new PropertyChangedEventArgs(propertyName));
        }
    }

}

public class MutexesViewModel
{
    public MutexesViewModel(IEnumerable<MutexViewModel>mutexes)
    {
        Mutexes = new ObservableCollection<MutexViewModel>(mutexes);
        foreach (var m in Mutexes)
        {
            m.PropertyChanged += MutexViewModel_PropertyChanged;
        }
    }

    private void MutexViewModel_PropertyChanged(object sender,PropertyChangedEventArgs e)
    {
        MutexViewModel m = (MutexViewModel) sender;
        if (e.PropertyName == "IsChecked" && m.IsChecked)
        {
            foreach(var other in Mutexes.Where(x => x != m))
            {
                other.IsChecked = false;
            }
        }
    }

    public ObservableCollection<MutexViewModel> Mutexes { get; set; }

}

创建一个项目,添加这些类,将ItemsControl XAML粘贴到主窗口的XAML中,并将其添加到主窗口的代码隐藏中：

public enum Test
    {
        Foo,Bar,Baz,Bat
    } ;

    public MainWindow()
    {
        InitializeComponent();

        var mutexes = Enumerable.Range(0,4)
            .Select(x => new MutexViewModel 
               { Text = Enum.GetName(typeof (Test),x) });

        DataContext = new MutexesViewModel(mutexes);
    }