How Can I Find WPF Controls by Their Type?

Find the WPF control according to the type

In WPF, the specific control may be located in the window according to the control type. This is very useful for searching for all instances of specific controls or implementing interfaces in the control.

Fortunately, WPF provides a direct method to achieve this purpose:

public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
{
    if (depObj == null) yield return (T)Enumerable.Empty<T>();
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
    {
        DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
        if (child != null && child is T)
        {
            yield return (T)child;
        }

        foreach (T childOfChild in FindVisualChildren<T>(child))
        {
            yield return childOfChild;
        }
    }
}

This method uses DependencyObject as the input, and recursively traverses the visual tree, and returns all sub -controls that match the specified type.

To use this method, just enumerate the controller in the following way:

foreach (TextBlock tb in FindVisualChildren<TextBlock>(window))
{
    // 对 TextBlock tb 执行操作
}

This method provides a flexible and effective method that can locate control in WPF according to the type.

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