How to iterate controls in WPF

I have a simple XAML file with a grid in it and textboxes. But when using my code it does not find the textboxes by iteration.

VB.Net:

Dim ctl As FrameworkElement = Me.MainWindow

Code:

Dim ChildrenCount As Integer = VisualTreeHelper.GetChildrenCount(ctl)
'ChildrenCount is always zero
For i As Integer = 0 To ChildrenCount - 1
    Dim Child As FrameworkElement = VisualTreeHelper.GetChild(ctl, i)
    Call SetLanguageToControls(Keyword, cLanguage, Child)
Next

XAML:

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow"  Icon="/OUTPUT%20-%20Histogram;component/Sprectrum.ico">
    <Grid x:Name="LayoutRoot">
        <Grid x:Name="SpectrumContent" Margin="8" Height="120" Width="320">
            <Rectangle Grid.Row="0" Grid.Column="1" Opacity="0.5">
                <Rectangle.Fill>
                    <LinearGradientBrush StartPoint="0,0" EndPoint="1,0">
                        <GradientStop Offset="0" Color="Black" />
                        <GradientStop Offset="1" Color="White" />
                    </LinearGradientBrush>
                </Rectangle.Fill>
            </Rectangle>
        <TextBlock x:Name="txtRedMin" Text="|Red:" Foreground="Red" FontWeight="Bold" />
        <TextBlock x:Name="txtRedMinValue" Text="000%" />
        </Grid>
    </Grid>
</Window>

EDIT Problem is solved. I used the code while managing language in my plu开发者_如何学编程gins. But MainWindow1.Loaded was not called. If Window is not loaded, this code does not work. If Window is loaded, this code works.

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It depends on what control you pass as ctl

If you pass the Window you'll get the Border

If you pass the Grid (Layout) you'll get the child grid.

EDIT

I just noticed this line

Dim ctl As FrameworkElement = Me.MainWindow

Change it into:

Dim ctl As FrameworkElement = Me

EDIT2

Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles Button1.Click
    Dim ctl As FrameworkElement
    ctl = LayoutRoot
    Dim ChildrenCount As Integer = VisualTreeHelper.GetChildrenCount(ctl)
    For i As Integer = 0 To ChildrenCount - 1
        Dim Child As FrameworkElement = VisualTreeHelper.GetChild(ctl, i)
        Debug.WriteLine(Child.ToString() + ": " +
                        VisualTreeHelper.GetChildrenCount(Child).ToString())
    Next
End Sub

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You have to call your function recursively for each child control. That is, in the following line you get a child of ctl:

Dim Child As FrameworkElement = VisualTreeHelper.GetChild(ctl, i)

After this, you need to iterate over children of Child.

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The VisualTreeHelper.GetChild method does not recurse. If you want recursion try using Linq-To-VisualTree, e.g.

var textBlocks = ctl.Descendants<TextBlock>();