WPF查找子控件和父控件方法

Posted 2021-01-04 mqxs

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));

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;
        }
    }
return null;
}

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);
    }

return null;
}

调用：

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

原文地址：https://www.cnblogs.com/udoless/p/3381411.html