wpf 虚拟化操作异常

根据这篇文章提供的方法会导致搜索变慢及有时候搜索不到 WPF中ItemsControl应用虚拟化时找到子元素的方法，

具体可以修改为下面代码：

 //Action action = () =>
                //{
                try
                {
                    TreeViewItem itemSelected = null;
 
                    //Force to generate every treeView item by using scroll item
                    if (virtualizingPanel != null)
                    {
                        try
                        {
                            if (isCallEnd)
                            {
                                isCallEnd = false;
                                virtualizingPanel.CallBringIndexIntoView(selectedIndex);
                                isCallEnd = true;
                            }
                        }
                        catch (System.Exception ex)
                        {
                            Logger.Error("CallBringIndexIntoView exception : ", ex);
                        }
 
                        itemSelected = (TreeViewItem)_currentSelectedItem.ItemContainerGenerator.ContainerFromIndex(selectedIndex);
                    }

增加变量isCallEnd 用来防止循环调用，-》CallBringIndexIntoView-》ItemContainerGenerator_StatusChanged-》treeViewItem_BringIntoView-》CallBringIndexIntoView