Gets the number of visual child elements within this element.
Assembly: PresentationFramework (in PresentationFramework.dll)
If your class supports more than one visual child in a child element collection, override this property to return the count of elements in that collection. You must do this even if the collection object itself returns a count. Element layout logic at the WPF framework level presumes that all elements will return a valid count through their property.
The following example shows how a custom adorner uses the values declared by a VisualCollection that it maintains for its multiple visual children and reports these values through overrides of and GetVisualChild.
' To store and manage the adorner's visual children. Private visualChildren As VisualCollection ... ' Override the VisualChildrenCount and GetVisualChild properties to interface with ' the adorner's visual collection. Protected Overrides ReadOnly Property VisualChildrenCount() As Integer Get Return visualChildren.Count End Get End Property Protected Overrides Function GetVisualChild(ByVal index As Integer) As Visual Return visualChildren(index) End Function