怎样才能得到内容演示者的孩子?

你可以用 VisualTreeHelper 这就是C语言中可以实现的(对不起,我是VB诵读困难者)

 T FindFirstChild<T>(FrameworkElement element) where T: FrameworkElement
    {
        int childrenCount = VisualTreeHelper.GetChildrenCount(element);
        var children = new FrameworkElement[childrenCount];

        for (int i = 0; i < childrenCount; i++)
        {
            var child = VisualTreeHelper.GetChild(element, i) as FrameworkElement;
            children[i] = child;
            if (child is T)
                return (T)child;
        }

        for (int i = 0; i < childrenCount; i++)
            if (children[i] != null)
            {
                var subChild = FindFirstChild<T>(children[i]);
                if (subChild != null)
                    return subChild;
            }

        return null;
    }

ContentPresenter 只有一个孩子。你得到 孩子

VisualTreeHelper.GetChild(yourContentPresenterObj, 0);

如果你需要深入到 TextBox ,那么,是的,您使用@alpha mouse建议的更全面的方法。

Dim myContentPresenter = CType(obj, ContentPresenter)
Dim myDataTemplate = myContentPresenter.ContentTemplate
Dim target = CType(myDataTemplate.FindName("txtQuantity", myContentPresenter), TextBox)