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

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About The Author

Suprotim Agarwal, ASP.NET Architecture MVP works as an Architect Consultant and provides consultancy on how to design and develop Web applications.

Suprotim is also the founder and primary contributor to DevCurry, DotNetCurry and SQLServerCurry. He has also written an EBook 51 Recipes using jQuery with ASP.NET Controls.

Follow him on twitter @suprotimagarwal