WPF查找子控件和父控件方法

一、查找某种类型的子控件，并返回一个List集合
public List<T> GetChildObjects<T>(DependencyObject obj, Type typename) 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).GetType() == typename))
{
childList.Add((T)child);
}
childList.AddRange(GetChildObjects<T>(child,typename));
}
return childList;
}
调用：
List<Button> listButtons = GetChildObjects<Button>(parentPanel, typeof(Button)); //parentPanel就是xaml里定义的控件的x:name
二、通过名称查找子控件，并返回一个List集合
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).GetType() == name |string.IsNullOrEmpty(name)))
{
childList.Add((T)child);
}
childList.AddRange(GetChildObjects<T>(child,name));
}
return childList;
}
调用：
List<Button> listButtons = GetChildObjects<Button>(parentPanel, "button1");
三、通过名称查找某子控件：
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;
}
}
returnnull;
}
调用：
StackPanel sp = GetChildObject<StackPanel>(this.LayoutRoot, "spDemoPanel");
四、通过名称查找父控件
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);
}

returnnull;
}
调用：
Grid layoutGrid = VTHelper.GetParentObject<Grid>(this.spDemoPanel, "LayoutRoot");