wpf如何获取control template里的元素 · WPF编程之路

wpf中的控件模板里的元素有自己独立的命名域。因此不能通过FindName来根据x：Name来查找子节点。自己写了一个方法，通过可视树遍历子节点，然后匹配名字。如下： ~~~ private static ChildItem FindVisualChildItem<ChildItem>(DependencyObject obj) where ChildItem : DependencyObject { if (null != obj) { 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 = FindVisualChildItem<ChildItem>(child); if (childOfChild != null) return childOfChild; } } } return null; } private static ChildItem FindVisualChildItem<ChildItem>(DependencyObject obj, string name) where ChildItem : FrameworkElement { if (null != obj) { for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++) { DependencyObject child = VisualTreeHelper.GetChild(obj, i); if (child != null && child is ChildItem && (child as ChildItem).Name.Equals(name)) { return (ChildItem)child; } else { ChildItem childOfChild = FindVisualChildItem<ChildItem>(child, name); if (childOfChild != null && childOfChild is ChildItem && (childOfChild as ChildItem).Name.Equals(name)) { return childOfChild; } } } } return null; } ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ 今天无意中发现系统FrameworkElement自带了一个方法 ~~~ # [GetTemplateChild](http://msdn.microsoft.com/query/dev10.query?appId=Dev10IDEF1&l=EN-US&k=k(SYSTEM.WINDOWS.FRAMEWORKELEMENT.GETTEMPLATECHILD);k(TargetFrameworkMoniker-%22.NETFRAMEWORK%2cVERSION%3dV4.0%22);k(DevLang-CSHARP)&rd=true) 此方法同样实现了根据名字来获取控件模板里的子节点。反编译PresentaitionFramework，源码如下： protected internal DependencyObject GetTemplateChild(string childName) { FrameworkTemplate templateInternal = this.TemplateInternal; if (templateInternal == null) { return null; } return StyleHelper.FindNameInTemplateContent(this, childName, templateInternal) as DependencyObject; } internal static object FindNameInTemplateContent(DependencyObject container, string childName, FrameworkTemplate frameworkTemplate) { int num = StyleHelper.QueryChildIndexFromChildName(childName, frameworkTemplate.ChildIndexFromChildName); if (num == -1) { Hashtable @value = StyleHelper.TemplatedNonFeChildrenField.GetValue(container); if (@value != null) { return @value[childName]; } } return null; return StyleHelper.GetChild(container, num); } 主要是childIndexFromChildName根据name来查询index，然后根据index获取对应子节点。