【转载】wpf 查找指定类型的子控件

http://blog.csdn.net/fallincloud/article/details/6960255#

查找指定类型的子控件

/// <summary>
/// Find Child with Visual Tree
/// </summary>
/// <typeparam name="T">specail type</typeparam>
/// <param name="root">the element starts</param>
/// <returns></returns>
public static T FindChild<T>(DependencyObject root) where T : DependencyObject
{
    if (root == null)
        return null;

    T founded = null;

    for (int j = 0; j < VisualTreeHelper.GetChildrenCount(root); j++)
    {
        DependencyObject d = VisualTreeHelper.GetChild(root, j);
        T childType = d as T;
        if (childType == null)
        {
            founded = FindChild<T>(d);
            if (founded != null)
                break;
        }
        else
        {
            founded = childType;
            break;
        }
    }

    return founded;
}

		/// <summary>
		/// Find Child with Visual Tree
		/// </summary>
		/// <typeparam name="T">specail type</typeparam>
		/// <param name="root">the element starts</param>
		/// <returns></returns>
		public static T FindChild<T>(DependencyObject root) where T : DependencyObject
		{
			if (root == null)
				return null;

			T founded = null;

			for (int j = 0; j < VisualTreeHelper.GetChildrenCount(root); j++)
			{
				DependencyObject d = VisualTreeHelper.GetChild(root, j);
				T childType = d as T;
				if (childType == null)
				{
					founded = FindChild<T>(d);
					if (founded != null)
						break;
				}
				else
				{
					founded = childType;
					break;
				}
			}

			return founded;
		}

查找指定类型指定名称的子控件：

/// <summary>
/// Find Child with Visual Tree
/// </summary>
/// <typeparam name="T">specail type</typeparam>
/// <param name="root">the element starts</param>
/// <returns></returns>
public static T FindChild<T>(DependencyObject root, string name) where T : DependencyObject
{
    if (root == null)
        return null;

    T founded = null;

    for (int j = 0; j < VisualTreeHelper.GetChildrenCount(root); j++)
    {
        DependencyObject d = VisualTreeHelper.GetChild(root, j);
        T childType = d as T;
        if (childType == null || ((d is FrameworkElement) && (d as FrameworkElement).Name != name))
        {
            founded = FindChild<T>(d, name);
            if (founded != null)
                break;
        }
        else
        {
            founded = childType;
            break;
        }
    }

    return founded;
}

		/// <summary>
		/// Find Child with Visual Tree
		/// </summary>
		/// <typeparam name="T">specail type</typeparam>
		/// <param name="root">the element starts</param>
		/// <returns></returns>
		public static T FindChild<T>(DependencyObject root, string name) where T : DependencyObject
		{
			if (root == null)
				return null;

			T founded = null;

			for (int j = 0; j < VisualTreeHelper.GetChildrenCount(root); j++)
			{
				DependencyObject d = VisualTreeHelper.GetChild(root, j);
				T childType = d as T;
				if (childType == null || ((d is FrameworkElement) && (d as FrameworkElement).Name != name))
				{
					founded = FindChild<T>(d, name);
					if (founded != null)
						break;
				}
				else
				{
					founded = childType;
					break;
				}
			}

			return founded;
		}

查找父控件：

public static T FindParent<T>(DependencyObject d) where T : DependencyObject
{
    DependencyObject parent = d;
    while (parent != null)
    {
        parent = VisualTreeHelper.GetParent(parent);
        if (parent != null && (parent.GetType() == typeof(T)))
        {
            return parent as T;
        }
    }
    return parent as T;
}