treeviewhelper用法，找child的UIElement

List<InfoWindow> infowindows = treeviewhelper.GetChildObjects<InfoWindow>(gridMap, "");

public class TreeViewHelper
{
public T GetParentObject<T>(DependencyObject obj, string name) where T : FrameworkElement
{
DependencyObject parent = VisualTreeHelper.GetParent(obj);

while (parent != null)
{
if (parent is T && (((T)parent).Name == name | string.IsNullOrEmpty(name)))
{
return (T)parent;
}

parent = VisualTreeHelper.GetParent(parent);
}

return null;
}

public T GetChildObject<T>(DependencyObject obj, string name) where T : FrameworkElement
{
DependencyObject child = null;
T grandChild = null;

for (int i = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; i++)
{
child = VisualTreeHelper.GetChild(obj, i);

if (child is T && (((T)child).Name == name | string.IsNullOrEmpty(name)))
{
return (T)child;
}
else
{
grandChild = GetChildObject<T>(child, name);
if (grandChild != null)
return grandChild;
}
}

return null;

}

public List<T> GetChildObjects<T>(DependencyObject obj, string name) where T : FrameworkElement
{
DependencyObject child = null;
List<T> childList = new List<T>();

for (int i = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; i++)
{
child = VisualTreeHelper.GetChild(obj, i);

if (child is T && (((T)child).Name == name || string.IsNullOrEmpty(name)))
{
childList.Add((T)child);
}

childList.AddRange(GetChildObjects<T>(child, ""));
}

return childList;

}

}