WPF 获取 ListView DataTemplate 中控件值

原文:WPF 获取 ListView DataTemplate 中控件值

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RT

虽然DataTemplate 是用来绑定的,一般用ONE TWOWAY 来绑定传递或获取数据.

但是今天这个需求真是没办法,在绑定的模板内添加了一个非绑定的数据,需要手动取值.

解决方案原理:

https://msdn.microsoft.com/zh-cn/library/bb613579.aspx

            foreach (var item in FListView.Items)
            {

                var myListBoxItem = (ListViewItem)FListView.ItemContainerGenerator.ContainerFromItem(item);

                // Getting the ContentPresenter of myListBoxItem
                var myContentPresenter = FindVisualChild<ContentPresenter>(myListBoxItem);

                // Finding textBlock from the DataTemplate that is set on that ContentPresenter
                DataTemplate myDataTemplate = myContentPresenter.ContentTemplate;

                var obj = myDataTemplate.FindName("CheckNum", myContentPresenter);//CheckNum 是在模板内定义的 x:Name

                var checkNum = obj as NumericControl;//自定义控件

                if (checkNum != null)
                {//...do something
                }
            }

        private childItem FindVisualChild<childItem>(DependencyObject obj)
            where childItem : DependencyObject
        {
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
            {
                DependencyObject child = VisualTreeHelper.GetChild(obj, i);
                if (child != null && child is childItem)
                    return (childItem)child;
                else
                {
                    childItem childOfChild = FindVisualChild<childItem>(child);
                    if (childOfChild != null)
                        return childOfChild;
                }
            }
            return null;
        }