Silverlight和Visual Tree Manipulation

public static class VisualTreeEnumeration
{
 public static IEnumerable Descendents(this DependencyObject root, int depth)
 {
 int count = VisualTreeHelper.GetChildrenCount(root);
 for (int i = 0; i  {
 var child = VisualTreeHelper.GetChild(root , i);
 yield return child;
 if (depth> 0)
 {
 foreach (var descendent in Descendents(child, --depth))
 yield return descendent;
 }
 }
 }

 public static IEnumerable Descendents(this DependencyObject root)
 {
 return Descendents( root, Int32.MaxValue); 
 }

 public static IEnumerable Ancestors(thi s DependencyObject root)
 {
 DependencyObject current = VisualTreeHelper.GetParent(root);
 while (current != null)
 {
 yield return current;
 current = VisualTreeHelper.GetParent(current);
 }
 }
 }

// Get all text boxes in usercontrol:-
 this.Descendents().OfType();

 // All UIElement direct children of the layout root grid:-
 LayoutRoot.Descendents(0).OfType();

 // Find the containing `ListBoxItem` for an element:-< br /> elem.Ancestors().OfType.FirstOrDefault();

 // Seek button with name "PinkElephants" even if outside of the current Namescope:-
 this. Descendents()
 .OfType()
 .FirstOrDefault(b => b.Name == "PinkElephants");

Now This may be more troublesome than its value. However, it is really useful for me now.

What I want to know is how I operate Silverlight at runtime Visualize the tree. It’s easy to do simple things like adding and removing controls, but when you start traversing the tree with any reasonable complexity, I find myself eager to use JQuery style syntax (I think LINQ is also cool) to deal with DOM node replacement, actions, etc.

So I guess the question is, is there any library that can make this job easier, or is there something I missed?

Yes, the Linq extension method is what you are after, but you need to place a small infrastructure first: –

public static class VisualTreeEnumeration
{
 public static IEnumerable Descendents(this DependencyObject root, int depth)
 {
 int count = VisualTreeHelper.GetChildrenCount (root);
 for (int i = 0; i  {
 var child = VisualTreeHelper.GetChild(root, i);
 yield return child; 
 if (depth> 0)
 {
 foreach (var descendent in Descendents(child, --depth))
 yield return descendent;
 }
 }
 }

 public static IEnumerable Descendents(this DependencyObject root)
 {
 return Descendents(root, Int32.MaxValue); 
} 

 public static IEnumerable Ancestors(this DependencyObject root)
 {
 D ependencyObject current = VisualTreeHelper.GetParent(root);
 while (current != null)
 {
 yield return current;
 current = VisualTreeHelper.GetParent(current);
 }
 }
 }

Now, you can use Linq to query the visual tree using Linq. Some examples: –

/ / Get all text boxes in usercontrol:-
 this.Descendents().OfType();

 // All UIElement direct children of the layout root grid:-
 LayoutRoot.Descendents(0).OfType();

 // Find the containing `ListBoxItem` for an element:-
 elem.Ancestors().OfType .FirstOrDefault();

 // Seek button with name "PinkElephants" even if outside of the current Namescope:-
 this.Descendents()
 .OfType( )
 .FirstOrDefault(b => b.Name == "PinkElephants");