c#代码修改xaml中listbox的datatemplate中的控件

        public static void SearchVisualTree(DependencyObject targetElement, int width,string Node)
        {
            var count = VisualTreeHelper.GetChildrenCount(targetElement);

            if (count == 0)
            {
                return;
            }
            for (int i = 0; i < count; i++)
            {
                var child = VisualTreeHelper.GetChild(targetElement, i);
                if (child is TextBlock)
                {
                    TextBlock targetItem = (TextBlock)child;
                    if (targetItem.Name == Node)
                        targetItem.Width = width;
                }
                else
                {
                    SearchVisualTree(child, width,Node);
                }
            }
        }

用法：DBHelper.SearchVisualTree(listboxname,300,"textBox1");