我正在尝试将我的 UserControl(一组单选按钮)中包含的 ItemsControl 的 ItemsSource 属性绑定到同一 UserControl 的属性。当使用 UserControl 时,这应该由 DependencyProperty 驱动。但是我不能让它工作,如果我硬编码控制名称,分配工作正常。
这是课程:
public partial class GroupListBox : UserControl
{
public GroupListBox()
{
InitializeComponent();
}
private List<RadioButton> _itemsList = new List<RadioButton>();
public List<RadioButton> ItemsList
{
get { return _itemsList; }
set
{
_itemsList = value;
}
}
public IEnumerable ItemsSource
{
get { return (IEnumerable)GetValue(ItemsSourceProperty); }
set { SetValue(ItemsSourceProperty, value); }
}
public static readonly DependencyProperty ItemsSourceProperty =
DependencyProperty.Register("ItemsSource", typeof(IEnumerable), typeof(GroupListBox), new FrameworkPropertyMetadata(null, OnItemsSourceChanged));
private static void OnItemsSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var control = (GroupListBox)d;
var grpName = control.GetHashCode().ToString(); // used to generate a unique GroupName
var oldValue = (IEnumerable)e.OldValue;
var newValue = (IEnumerable)e.NewValue;
if ((e.NewValue == null) && !BindingOperations.IsDataBound(d, ItemsSourceProperty))
{
control.ItemsList.Clear();
}
else
{
var radioItems = (from object item in newValue select new RadioButton() { Content = item, GroupName = grpName }).ToList();
//control.container.ItemsSource = radioItems; // *** this works
control.ItemsList = radioItems; // *** this doesn`t
}
}
这是 XAML
<Border x:Name="brdMain">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TextBlock x:Name="txtTitle" Grid.Column="1" Grid.ColumnSpan="2" Grid.Row="0" Text="" />
<Image x:Name="imgImage" Grid.Column="0" Grid.Row="1" />
<ScrollViewer x:Name="scroll" Grid.Row="1" Grid.Column="1" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" CanContentScroll="True">
<!--This is the control I want to bind-->
<ItemsControl x:Name="container" ItemsSource="{Binding Path=ItemsList}" >
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel/>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
</ItemsControl>
</ScrollViewer>
</Grid>
</Border>
像这样使用:
<cust:GroupListBox ItemsSource="{Binding SymmetryAxis}"></cust:GroupListBox>
我确定我的控件绑定有问题,但我不知道是什么。有什么线索吗?
编辑:我在 XAML 中做了一些小改动:现在看起来像这样:
<ItemsControl Name="container" Width="{Binding ElementName=scroll, Path=ViewportWidth}" ItemsSource="{Binding Path=ItemsSource, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:GroupListBox}}}" ItemTemplate="{StaticResource ItemPanelDatatemplate}" />
这是 DataTemplate :
<DataTemplate DataType="{x:Type ItemsPanelTemplate}" x:Key="ItemPanelDatatemplate">
<RadioButton Content="{Binding}" GroupName="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=ItemsControl}, Path=Name}"></RadioButton> </DataTemplate>
无论如何,这会给 GroupName 带来问题,因为它总是空的,然后所有 RadioButtons 的行为就像它们在一个组中一样。
如何获得与后面的代码相同的结果(例如为每个组分配一个唯一的名称?