Question

我想以编程方式更改ListBoxItem的ContentTemplateRoot属性。它包含一个文本块，但我想将其分组到一个网格中并添加一些新元素。

我有自己的课程：

public class MyListboxItemClass : ListBoxItem
{  
      protected override void OnPointerMoved(PointerRoutedEventArgs e)       
      {           
       // here I want to add those new elements as parent of my content...        
      }
}

我试图简单地更改内容，但它不起作用......

实际上我想将ContentTemplateRoot属性更改为Grid ...

Answer 1

我已经做到了，它看起来很有效:(它只是为了展示如何做到，不完美，有一些不必要的代码）

 private object oldRootContent;

public ListboxGestureHandlerItem()
{
    Loaded += ListboxGestureHandlerItem_Loaded;
    LayoutUpdated += ListboxGestureHandlerItem_LayoutUpdated;
}

private void ListboxGestureHandlerItem_LayoutUpdated(object sender, object e)
{
    if(oldRootContent != null && (ContentTemplateRoot as Grid) != null)
    {
        (ContentTemplateRoot as Grid).Children.Add(oldRootContent as FrameworkElement);
        oldRootContent = null;
    }
}

private void ListboxGestureHandlerItem_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
    oldRootContent = (sender as ListboxGestureHandlerItem).ContentTemplateRoot;

    this.ContentTemplate = Create(typeof(Grid));
}

protected override void OnPointerMoved(PointerRoutedEventArgs e)
{
    base.OnPointerMoved(e);
}

public DataTemplate Create(Type type)
{
    return XamlReader.Load(@"<DataTemplate 
xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""> 
    <" + type.Name + @"/> 
</DataTemplate>") as DataTemplate;
}

如何在uwp中以编程方式更改ContentTemplateRoot？

1 个答案: