怎么获取ListBox下的TextBlock的Text属性？

悬赏园豆：20 [已解决问题] 解决于 2015-07-15 15:06

代码片段如下：

我想通过页面间值传递给上面4个TextBlock的Text属性赋值，但在OnNavigatedTo()方法中点不出pText，赋值无法进行，用什么方法搞出来。求教。

WPF wp8

AkazaAkari | 初学一级 | 园豆：184
提问于：2015-07-10 15:31

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最佳答案

datetemplate里面没办法直接搞出来，你只能借助类似visualtreehelpex等视觉树/逻辑树的相关查找子元素的方法来定位到你的textBlock了

当然还有中简单的方法，就是通过将listitem跟模型双向绑定的方法来解决这个问题，这样你只要通过模型中特定的属性就可以实现对textblock值得操作了

收获园豆：20

visonme | 小虾三级 |园豆：1674 | 2015-07-10 15:50

是这样啊，那能不能用视觉树/逻辑树的方法举个例子，这样的方法没用过，谢谢

AkazaAkari | 园豆：184 (初学一级) | 2015-07-10 16:02

@AkazaAkari:

这里又有以前写的一个视觉树（父/子）对象查找的辅助类

public static class VisualTreeHelperEx
    {
        public static DependencyObject FindAncestorByType(DependencyObject element, Type type, bool specificTypeOnly)
        {
            if (element == null)
            {
                return null;
            }
            if (specificTypeOnly ? (element.GetType() == type) : (element.GetType() == type || element.GetType().IsSubclassOf(type)))
            {
                return element;
            }
            return VisualTreeHelperEx.FindAncestorByType(VisualTreeHelper.GetParent(element), type, specificTypeOnly);
        }

        public static T FindAncestorByType<T>(DependencyObject depObj) where T : DependencyObject
        {
            if (depObj == null)
            {
                return default(T);
            }
            if (depObj is T)
            {
                return (T)((object)depObj);
            }
            T t = default(T);
            return VisualTreeHelperEx.FindAncestorByType<T>(VisualTreeHelper.GetParent(depObj));
        }

        public static Visual FindDescendantByName(Visual element, string name)
        {
            if (element == null)
            {
                return null;
            }
            if (element is FrameworkElement && (element as FrameworkElement).Name == name)
            {
                return element;
            }
            Visual visual = null;
            if (element is FrameworkElement)
            {
                (element as FrameworkElement).ApplyTemplate();
            }
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(element); i++)
            {
                Visual element2 = VisualTreeHelper.GetChild(element, i) as Visual;
                visual = VisualTreeHelperEx.FindDescendantByName(element2, name);
                if (visual != null)
                {
                    break;
                }
            }
            return visual;
        }

        public static Visual FindDescendantByType(Visual element, Type type)
        {
            return VisualTreeHelperEx.FindDescendantByType(element, type, true);
        }

        public static Visual FindDescendantByType(Visual element, Type type, bool specificTypeOnly)
        {
            if (element == null)
            {
                return null;
            }
            if (specificTypeOnly ? (element.GetType() == type) : (element.GetType() == type || element.GetType().IsSubclassOf(type)))
            {
                return element;
            }
            Visual visual = null;
            if (element is FrameworkElement)
            {
                (element as FrameworkElement).ApplyTemplate();
            }
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(element); i++)
            {
                Visual element2 = VisualTreeHelper.GetChild(element, i) as Visual;
                visual = VisualTreeHelperEx.FindDescendantByType(element2, type, specificTypeOnly);
                if (visual != null)
                {
                    break;
                }
            }
            return visual;
        }

        public static IEnumerable<Visual> FindAllDescendantByType(Visual element, Type type, bool specificTypeOnly)
        {
            if (element == null)
            {
                return null;
            }
            if (specificTypeOnly ? (element.GetType() == type) : (element.GetType() == type || element.GetType().IsSubclassOf(type)))
            {
                return new List<Visual>
                {
                    element
                };
            }
            List<Visual> list = new List<Visual>();
            if (element is FrameworkElement)
            {
                (element as FrameworkElement).ApplyTemplate();
            }
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(element); i++)
            {
                Visual element2 = VisualTreeHelper.GetChild(element, i) as Visual;
                list.AddRange(VisualTreeHelperEx.FindAllDescendantByType(element2, type, specificTypeOnly));
            }
            return list;
        }

        public static IEnumerable<T> FindAllDescendantByType<T>(Visual element) where T : Visual
        {
            IEnumerable<Visual> source = VisualTreeHelperEx.FindAllDescendantByType(element, typeof(T), true);
            return source.Cast<T>();
        }

        public static T FindDescendantByType<T>(Visual element) where T : Visual
        {
            Visual visual = VisualTreeHelperEx.FindDescendantByType(element, typeof(T));
            return (T)((object)visual);
        }

        public static Visual FindDescendantWithPropertyValue(Visual element, DependencyProperty dp, object value)
        {
            if (element == null)
            {
                return null;
            }
            if (element.GetValue(dp).Equals(value))
            {
                return element;
            }
            Visual visual = null;
            if (element is FrameworkElement)
            {
                (element as FrameworkElement).ApplyTemplate();
            }
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(element); i++)
            {
                Visual element2 = VisualTreeHelper.GetChild(element, i) as Visual;
                visual = VisualTreeHelperEx.FindDescendantWithPropertyValue(element2, dp, value);
                if (visual != null)
                {
                    break;
                }
            }
            return visual;
        }
    }

visonme | 园豆：1674 (小虾三级) | 2015-07-10 16:11

@visonme: 谢谢，我研究研究

AkazaAkari | 园豆：184 (初学一级) | 2015-07-10 16:14

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怎么获取ListBox下的TextBlock的Text属性？

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