在WPF中保留扩展器状态 [英] Retain expander state in WPF

问题描述

我有一个listview，在扩展器下进行分组。这些项目是动态生成的。我可以访问窗口控件中的所有扩展器并保存它们的状态。之后，listview的item source属性被更改。现在，如果我尝试获取扩展器或任何其他UI控件，该函数始终返回null。功能如下：

I have listview with grouping under an expander. The items are dynamically generated. I can Access all the expanders in window control and save their state. Afterwards the item source property of listview is changed. Now if I try to get expanders or any other UI control, the function always returns null. The function is given below

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

我尝试过：



我尝试过使用其他几个功能但无济于事。

What I have tried:

I have tried using several other functions but to no avail.

推荐答案

I我快速浏览了 Google [ ^ ]并找到了这个解决方案： wpf - 如何在列表视图的组头中保存IsExpanded状态 - Take 2 - Stack溢出 [ ^ ]

I had a quick look on Google[^] and found this solution: wpf - How to save the IsExpanded state in group headers of a listview - Take 2 - Stack Overflow[^]

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