/// <summary>///同步父子節點勾選狀態///說明///在AfterCheckNode事件中使用代碼///eg:e.Node.SyncNodeCheckState(e.Node.CheckState);/// </summary>/// <param name="node">需要同步的節點</param>/// <param name="check">節點當前勾選狀態</param>public static void SyncNodeCheckState(this TreeListNode node, CheckState check) { SyncNodeCheckState_Child(node, check); SyncNodeCheckState_Parent(node, check); }private static void SyncNodeCheckState_Child(TreeListNode node, CheckState check){  if (node != null)  { node.DownRecursiveNode(n => n.CheckState = check);  }}private static void SyncNodeCheckState_Parent(TreeListNode node, CheckState check){  if (node.ParentNode != null)  { bool _cked = false; CheckState _ckState; foreach (TreeListNode cn in node.ParentNode.Nodes) {   _ckState = cn.CheckState;   if (check != _ckState)   { _cked = !_cked; break;   } } node.ParentNode.CheckState = _cked ? CheckState.Indeterminate : check; SyncNodeCheckState_Parent(node.ParentNode, check);  }}/// <summary>/// 向下遞歸TreeListNode節點/// </summary>/// <param name="node">需要向下遞歸的節點</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);  }}