c# - 按类型查找 WPF 窗口中的所有控件

Question

我正在寻找一种方法来按类型查找 Window 上的所有控件，

例如:查找所有TextBoxes，查找所有实现特定接口(interface)的控件等。

Answer 1

这应该可以解决问题:

public static IEnumerable<T> FindVisualChilds<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 ithChild = VisualTreeHelper.GetChild(depObj, i);
        if (ithChild == null) continue;
        if (ithChild is T t) yield return t;
        foreach (T childOfChild in FindVisualChilds<T>(ithChild)) yield return childOfChild;
    }
}

然后你像这样枚举控件

foreach (TextBlock tb in FindVisualChildren<TextBlock>(window))
{
    // do something with tb here
}