WPF 从当前层次遍历查找 子控件及父控件
SilverLight遍历父子控件的通用方法 想从SilverLight中DataGrid找元素,真是麻烦,没有Rows对象,无法遍历。从网上找来这些方法,挺好用的: public class VTHelper() {
//GetParentObject方法,获取父控件方法。该方法将根据当前控件,遍历查找其父控件是否存在。参数1是表示当前子控件名,参数2是要查询父控件名;使用VisualTreeHelper.GetParent方法获取当前父控件。 public T GetParentObject<T>(DependencyObject obj, string name) where T : FrameworkElement { DependencyObject parent = VisualTreeHelper.GetParent(obj); while (parent != null) { if (parent is T && (((T)parent).Name == name | string.IsNullOrEmpty(name))) { return (T)parent; } parent = VisualTreeHelper.GetParent(parent); } return null; } //GetChildObject,获取子控件方法。该方法将根据当前控件,遍历查找其子控件是否存在。参数1是表示当前父控件名,参数2是要查询子控件名; public T GetChildObject<T>(DependencyObject obj, string name) where T : FrameworkElement { DependencyObject child = null; T grandChild = null; for (int i = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; i++) { child = VisualTreeHelper.GetChild(obj, i); if (child is T && (((T)child).Name == name | string.IsNullOrEmpty(name))) { return (T)child; } else { grandChild = GetChildObject<T>(child, name); if (grandChild != null) return grandChild; } } return null; } //GetChildObjects方法,该方法将把所有子控件作为List集合返回到客户端。其中第一个参数是父控件参数,而第二个参数是特定子控件名称,如果需要遍历全部子控件,第二个参数留空即可。 public List<T> GetChildObjects<T>(DependencyObject obj, string name) where T : FrameworkElement { DependencyObject child = null; List<T> childList = new List<T>(); for (int i = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; i++) { child = VisualTreeHelper.GetChild(obj, i); if (child is T && (((T)child).Name == name || string.IsNullOrEmpty(name))) { childList.Add((T)child); } childList.AddRange(GetChildObjects<T>(child,"")); } return childList; } }
调用示例
private void btModifyChilds_Click(object sender, RoutedEventArgs e)
{
Globals VTHelper = new Globals();
List<TextBlock> textblock = VTHelper.GetChildObjects<TextBlock>(this.LayoutRoot, "");
foreach (TextBlock tmpTextblock in textblock)
{
tmpTextblock.FontSize += 6;
}
}
Type t =
typeof
(MyChild);
bool
是否是某个的子类 = t.IsSubclassOf(
typeof
(MyBase));
bool
是否是枚举 = t.GetProperty(
"TestState"
).PropertyType.IsEnum;