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