WPF silverlight获取子控件（获取DataTemplate里的子控件）

public static class VisualTreeExtensions
{
/// <summary>
/// 获取父节点控件
/// </summary>
/// <typeparam name="T">子控件UI</typeparam>
/// <param name="obj">子控件</param>
/// <param name="name">父容器名称</param>
/// <returns>父容器对象</returns>
public static T GetParent<T>(this DependencyObject obj, string name = null) 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;
}
/// <summary>
/// 获取子控件
/// </summary>
/// <typeparam name="T">UI类型</typeparam>
/// <param name="obj">父容器对象</param>
/// <param name="name">子控件名称</param>
/// <returns>子控件</returns>
public static T GetChild<T>(this DependencyObject obj, string name = null) 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 = GetChild<T>(child, name);
if (grandChild != null)
return grandChild;
}
}
return null;
}
/// <summary>
/// 获取子控件集合
/// </summary>
/// <typeparam name="T">UI类型</typeparam>
/// <param name="obj">父容器对象</param>
/// <param name="name">子控件名称</param>
/// <returns>子控件集合</returns>
public static List<T> GetChildren<T>(this DependencyObject obj, string name = null) 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(GetChildren<T>(child, ""));
}
return childList;
}

/// <summary>
/// 查找某控件下的所有給定類型的子控件集合
/// </summary>
/// <typeparam name="T">要查找的子控件類型</typeparam>
/// <param name="depObj">父控件</param>
/// <returns>子控件集合</returns>
public static T FindVisualChild<T>(this DependencyObject depObj, string childName = null) where T : FrameworkElement
{
if (depObj != null)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
if (child != null && child is T &&
(((T)child).Name == childName || string.IsNullOrEmpty(childName)))
{
return (T)child;
}
else
{
T childOfChild = FindVisualChild<T>(child, childName);
if (childOfChild != null && childOfChild is T)
{
return childOfChild;
}
}
}
return null;
}
return null;
}

/// <summary>
/// 查找某控件下的所有給定類型的子控件集合
/// </summary>
/// <typeparam name="T">要查找的子控件類型</typeparam>
/// <param name="depObj">父控件</param>
/// <returns>子控件集合</returns>
public static List<T> FindVisualChildren<T>(this DependencyObject depObj, string childName = null) where T : FrameworkElement
{
List<T> list = new List<T>();
if (depObj != null)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
{
DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
if (child != null && child is T
&& (((T)child).Name == childName || string.IsNullOrEmpty(childName)))
{
list.Add((T)child);
}

List<T> childItems = FindVisualChildren<T>(child, childName);
if (childItems != null && childItems.Count > 0)
{
foreach (var item in childItems)
{
list.Add(item);
}
}
}
}
return list;
}
}