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Generic method to find all TextBox controls in Silverlight

void Page_Loaded(object sender, RoutedEventArgs e) 
{ 
    // Instantiate a list of TextBoxes 
    List<TextBox> textBoxList = new List<TextBox>(); 
 
    // Call GetTextBoxes function, passing in the root element, 
    // and the empty list of textboxes (LayoutRoot in this example) 
    GetTextBoxes(this.LayoutRoot, textBoxList); 
 
    // Now textBoxList contains a list of all the text boxes on your page. 
    // Find all the non empty textboxes, and put them into a list. 
    var nonEmptyTextBoxList = textBoxList.Where(txt => txt.Text != string.Empty).ToList(); 
 
    // Do something with each non empty textbox. 
    nonEmptyTextBoxList.ForEach(txt => Debug.WriteLine(txt.Text)); 
} 
 
private void GetTextBoxes(UIElement uiElement, List<TextBox> textBoxList) 
{ 
    TextBox textBox = uiElement as TextBox; 
    if (textBox != null) 
    { 
        // If the UIElement is a Textbox, add it to the list. 
        textBoxList.Add(textBox); 
    } 
    else 
    { 
        Panel panel = uiElement as Panel; 
        if (panel != null) 
        { 
                // If the UIElement is a panel, then loop through it's children 
                foreach (UIElement child in panel.Children) 
                { 
                        GetTextBoxes(child, textBoxList); 
                } 
        } 
    } 
} 

Instantiate an empty list of TextBoxes. Call GetTextBoxes, passing in the root control on your page (in my case, that's this.LayoutRoot), and GetTextBoxes should recursively loop through every UI element that is a descendant of that control, testing to see if it's either a TextBox (add it to the list), or a panel, that might have descendants of it's own to recurse through.

还有其它的方法，如下：

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

Use this method like this to find all TextBoxes:

var textBoxes = GetChildsRecursive(LayoutRoot).OfType<TextBox>();