VisualTreeHelper.GetChildrenCount(DependencyObject) Method
Definition
Returns the number of children that exist in an object's child collection in the visual tree.
Equivalent WinUI method: Microsoft.UI.Xaml.Media.VisualTreeHelper.GetChildrenCount.
public:
static int GetChildrenCount(DependencyObject ^ reference); static int GetChildrenCount(DependencyObject const & reference);public static int GetChildrenCount(DependencyObject reference);function getChildrenCount(reference)Public Shared Function GetChildrenCount (reference As DependencyObject) As IntegerParameters
- reference
- DependencyObject
The source visual.
Returns
The number of visual children for the provided source visual.
Examples
Here's an example of a utility function that can copy a list of child elements of a particular type from within a visual tree. It uses the basic traversal methods GetChildrenCount and GetChild. It uses recursion so that elements can be found no matter what level of nesting within intermediate containers exists. It also uses an IsSubclassOf extension method from System.Reflection that extends the type comparison to consider subtypes as a match for a Type.
internal static void FindChildren<T>(List<T> results, DependencyObject startNode)
where T : DependencyObject
{
int count = VisualTreeHelper.GetChildrenCount(startNode);
for (int i = 0; i < count; i++)
{
DependencyObject current = VisualTreeHelper.GetChild(startNode, i);
if ((current.GetType()).Equals(typeof(T)) || (current.GetType().GetTypeInfo().IsSubclassOf(typeof(T))))
{
T asType = (T)current;
results.Add(asType);
}
FindChildren<T>(results, current);
}
}