Find all the Silverlight Button Controls On a Page

Recently I had to recursively list all the Silverlight Button controls on a Page. I stumbled across a piece of generic code suggested by tucod. Here’s the code for your reference which recursively finds all the Buttons in the VisualTree.

C#

public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
var btns = GetButtonControls(LayoutRoot).OfType<Button>();
foreach (var btn in btns)
{
// btn.Content
}
}

IEnumerable<DependencyObject> GetButtonControls(DependencyObject root)
{
List<DependencyObject> doList = new List<DependencyObject>();
doList.Add(root);
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(root); i++)
doList.AddRange(GetButtonControls(VisualTreeHelper.GetChild(root, i)));

return doList;
}
}

VB.NET

Partial Public Class MainPage
Inherits UserControl
Public Sub New()
InitializeComponent()
Dim btns = GetButtonControls(LayoutRoot).OfType(Of Button)()
For Each btn In btns
' btn.Content
Next btn
End Sub

Private Function
GetButtonControls(ByVal root As _
DependencyObject) As IEnumerable(Of DependencyObject)
Dim doList As New List(Of DependencyObject)()
doList.Add(root)
For i As Integer = 0 To VisualTreeHelper.GetChildrenCount(root) - 1
doList.AddRange(GetButtonControls(VisualTreeHelper.GetChild(root, i)))
Next i

Return doList
End Function
End Class

The Windows.Media.VisualTreeHelper provides utility methods to traverse object relationships.

OUTPUT

image



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About The Author

Suprotim Agarwal
Suprotim Agarwal, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal.

3 comments:

Anonymous said...

I'm very happy that I found this solution!! Zsolt

Anonymous said...

Nice post Suprotim Agarwal, thank you!
Jesse

Rodney said...

Hi,

I ma having problems with GetChildrenCount - it returns 0 - I have to specify the exact parent element for it to work, I cant just point it at the top level element. Eg. I have a grid with a stackpanel with another grid and 2 textboxes. The textboxes will only be found if I enter their exact parent as the starting position. I want to find all textboxes on the page?