本文實例展示了DevExpress實現TreeList父子節點CheckState狀態同步的方法，在項目開發中有一定的應用價值，具體實現方法如下：
主要功能代碼如下：
/// <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); }}代碼運行效果如下圖所示：
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