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Get Children for DependencyObject

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Media; static class common {     public static List<UIElement> GetChildren(this DependencyObject parent, Type targetType)     {         List<UIElement> elements = new List<UIElement>();         int count = VisualTreeHelper.GetChildrenCount(parent);         if (count > 0)         {             for (int i = 0; i < count; i++)             {                 UIElement child = (UIElement)VisualTreeHelper.GetChild(parent, i);                 if (child.GetType() == targetType || targetType.IsAssignableFrom(child.GetType()))                 {                     elements.Add(child);                 }                 elements.AddRange(GetChildren(child, targetType));             }         }         return elements;     } }