DevExpress获取节点下可视区域子节点集合的实现方法

/// <summary>/// 向下递归TreeListNode节点/// </summary>/// <param name="node">需要向下递归的节点</param>/// <param name="conditionHanlder">委托</param>public static void DownRecursiveNode(this TreeListNode node, Action<TreeListNode> conditionHanlder){  foreach (TreeListNode _childNode in node.Nodes)  { conditionHanlder(_childNode); DownRecursiveNode(_childNode, conditionHanlder);  }}/// <summary>/// 获取节点下可视区域子节点集合/// </summary>/// <param name="node">需要获取可见子节点的节点</param>/// <param name="conditonHanlder">条件委托</param>/// <returns>可见子节点集合</returns>public static List<TreeListNode> GetVisibleChildNodes(this TreeListNode node, Predicate<TreeListNode> conditonHanlder){  List<TreeListNode> _visibleChildNodes = new List<TreeListNode>();  TreeList _tree = node.TreeList;  DownRecursiveNode(node, n =>  { RowInfo _rowInfo = _tree.ViewInfo.RowsInfo[n]; if (_rowInfo != null) {   if (conditonHanlder(n))   { _visibleChildNodes.Add(n);   } }  });  return _visibleChildNodes;}/// <summary>/// 获取节点下可视区域子节点集合/// </summary>/// <param name="node">需要获取可见子节点的节点</param>/// <returns>可见子节点集合</returns>public static List<TreeListNode> GetVisibleChildNodes(this TreeListNode node){  return GetVisibleChildNodes(node, n => 1 == 1);}