C# 如何获取ItemsPanel的实例?
我正在编写自定义控件,其中使用C# 如何获取ItemsPanel的实例?,c#,wpf,C#,Wpf,我正在编写自定义控件,其中使用 ItemsPanelProperty.OverrideMetadata(typeof(DataGrid), new FrameworkPropertyMetadata(new ItemsPanelTemplate( new FrameworkElementFactory(typeof(AdvancedVirtualizingStackPanel))))); 如何获取对已创建的AdvancedVirtualizangStackPanel实例的引用?
ItemsPanelProperty.OverrideMetadata(typeof(DataGrid),
new FrameworkPropertyMetadata(new ItemsPanelTemplate(
new FrameworkElementFactory(typeof(AdvancedVirtualizingStackPanel)))));
如何获取对已创建的
AdvancedVirtualizangStackPanel
实例的引用?好的,我会自己回答
首先,您需要获取ItemsPresenter
。您可以使用以下代码:
ItemsPresenter itemsPresenter =
(ItemsPresenter)GetTemplateChild(ItemsPresenterTemplateName);
// You have to name ItemsPresenter (using value of
// ItemsPresenterTemplateName string) in your XAML
然后:
itemsPresenter.ApplyTemplate(); // In case template is not applied yet
_stackPanel =
Helper.GetVisualChild<AdvancedVirtualizingStackPanel>(itemsPresenter);
public static T GetVisualChild<T>(DependencyObject parent) where T : Visual
{
T child = default(T);
int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
for (int i = 0; i < numVisuals; i++)
{
Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
child = v as T;
if (child == null)
{
child = GetVisualChild<T>(v);
}
if (child != null)
{
break;
}
}
return child;
}