我正在創建自定義用戶控件。我的目標是使控制可重用。 我使用ItemsControl的,這裏是XAML我可以將類型Type的依賴項屬性綁定/設置爲DataTemplate的DataType
<ItemsControl ItemsSource="{Binding Path=ItemSource , RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type controls:MyItemsControlWithButtons}}}">
<ItemsControl.ItemTemplate>
<DataTemplate DataType="{x:Type Type=typeOf(DataTemplateType)????}">
<ContentControl x:Name="instruction" Content="{Binding Path=DataTemplateControl, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type controls:MyItemsControlWithButtons}}}"/>
<DataTemplate.Triggers>
<Trigger Property="ItemsControl.AlternationIndex" Value="0">
<Setter Property="Background" Value="#DDDDDD" TargetName="instruction" />
</Trigger>
<Trigger Property="ItemsControl.AlternationIndex" Value="1">
<Setter Property="Background" Value="#EEEEEE" TargetName="instruction" />
</Trigger>
</DataTemplate.Triggers>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
這裏是控制:MyItemsControlWithButtons
public partial class DraggableItemsControlWithButtons : UserControl
{
public DraggableItemsControlWithButtons()
{
InitializeComponent();
}
public static readonly DependencyProperty DataTemplateTypeProperty =
DependencyProperty.Register(nameof(DataTemplateType), typeof(Type), typeof(DraggableItemsControlWithButtons), new UIPropertyMetadata(null));
public Type DataTemplateType
{
get { return (Type)GetValue(DataTemplateTypeProperty); }
set { SetValue(DataTemplateTypeProperty, value); }
}
public static readonly DependencyProperty ItemSourceProperty =
DependencyProperty.Register(nameof(ItemSource), typeof(IEnumerable), typeof(DraggableItemsControlWithButtons), new UIPropertyMetadata(null));
public IEnumerable ItemSource
{
get { return (IEnumerable)GetValue(ItemSourceProperty); }
set { SetValue(ItemSourceProperty, value); }
}
public static readonly DependencyProperty DataTemplateControlProperty =
DependencyProperty.Register(nameof(DataTemplateControl), typeof(Control), typeof(DraggableItemsControlWithButtons), new UIPropertyMetadata(null));
public Control DataTemplateControl
{
get { return (Control)GetValue(DataTemplateControlProperty); }
set { SetValue(DataTemplateControlProperty, value); }
}
}
正如你可以看到我想要/套DataTemplateType結合的ItemsControl.ItemTemplate的DataTemplate中
數據類型我該如何實現它?
謝謝
它不是因爲您已將DataTemplate明確地分配給ItemTemplate屬性,所以在此處無需設置DataType。數據類型沒有自動匹配選擇。 – Clemens
你可能想要的是能夠在外部設置ItemTemplate。在UserControl中創建DataTemplate類型的依賴屬性,並將ItemsSource ItemTemplate綁定到它。 – Clemens
@Clemens你能提供樣本代碼嗎? –