WPF ItemsControl:将ItemsControl的ItemsSource从当前选择的另一个ItemsControl更改为

Question

我有一个包含产品类别的ItemsControl，还有一个包含当前选择的所有文章的列表的ItemsControl，我需要将当前选择的类别与ItemsControl文章的绑定关联起来

<ItemsControl ItemsSource="{Binding Path=Categories}">
...
<ItemsControl.ItemTemplate>
    <DataTemplate>
          <Button Content="{Binding Path=CategorieCaption}"/>
     </DataTemplate>
</ItemsControl.ItemTemplate>
...
</ItemsControl>


<ItemsControl ItemsSource="{Binding Path=SelectedCategories.Articles}">
...
<ItemsControl.ItemTemplate>
    <DataTemplate>
          <Button Content="{Binding Path=ArticleCaption}"/>
     </DataTemplate>
</ItemsControl.ItemTemplate>
...
</ItemsControl>

Answer 1

您只需在每次更改Category时更新数据绑定Article集合。如果使用ListBox.SelectedItem将属性添加到数据绑定中，则可以通过属性设置器执行此操作：

<ListBox ItemsSource="{Binding Categories}"
    SelectedItem="{Binding SelectedCategory}" ... />

。。

public Category SelectedCategory
{
    get { return selectedCategory; }
    set
    {
        if (selectedCategory != value)
        {
            selectedCategory = value;
            NotifyPropertyChanged("SelectedCategory");
            // Selected Category was changed, so update Articles collection
            Articles = UpdateArticlesByCategory(selectedCategory);
        }
    }
}