本文实例总结了DevExpress之TreeList用法，希望对大家学习C#程序设计起到一定的帮助作用。具体实例如下：
using System; using System.Collections.Generic; using System.Drawing; using System.Windows.Forms; using DevExpress.XtraBars; using DevExpress.XtraTreeList; using DevExpress.XtraTreeList.Nodes; namespace DevExpressUtilHelpV3 { public static class TreeListToolV3 { public delegate string BuildPathRule(string nodeText, string fullPathInfo); /// <summary> /// 获取选中节点到根节点的所有信息 /// </summary> /// <param name="focusedNode">TreeListNode</param> /// <param name="columnID">列名称</param> /// <param name="buildPathRule">规则委托</param> /// <returns>路径信息</returns> public static string FullPathInfo(this TreeListNode focusedNode, string columnID, BuildPathRule buildPathRule) { if (focusedNode == null) throw new ArgumentNullException("focusedNode"); if (string.IsNullOrEmpty("columnID")) throw new ArgumentNullException("columnID"); string _fullPathInfo = string.Empty; _fullPathInfo = focusedNode.GetDisplayText(columnID); while (focusedNode.ParentNode != null) { focusedNode = focusedNode.ParentNode; string _nodeText = focusedNode.GetDisplayText(columnID).Trim(); _fullPathInfo = buildPathRule(_nodeText, _fullPathInfo); } return _fullPathInfo; } public delegate bool CompareNodeRule(TreeListNode focusedNode); /// <summary> /// 获取筛选节点到根节点的所有信息 /// </summary> /// <param name="focusedNode">TreeListNode</param> /// <param name="columnID">列名称</param> /// <param name="compareNodeRule">规则委托</param> /// <param name="buildPathRule">规则委托</param> /// <returns>路径信息</returns> public static string FilterPathInfo(this TreeListNode focusedNode, string columnID, CompareNodeRule compareNodeRule, BuildPathRule buildPathRule) { if (focusedNode == null) throw new ArgumentNullException("focusedNode"); if (string.IsNullOrEmpty("columnID")) throw new ArgumentNullException("columnID"); string _fullPathInfo = string.Empty; _fullPathInfo = focusedNode.GetDisplayText(columnID); while (focusedNode.ParentNode != null) { focusedNode = focusedNode.ParentNode; if (compareNodeRule(focusedNode)) { string _nodeText = focusedNode.GetDisplayText(columnID).Trim(); _fullPathInfo = buildPathRule(_nodeText, _fullPathInfo); } } return _fullPathInfo; } /// <summary> /// 递归遍历树节点 /// </summary> /// <param name="tree"></param> /// <param name="opreateRule"></param> public static void LoopTree(this TreeList tree, Action<TreeListNode> opreateRule) { if (tree == null) throw new ArgumentNullException("tree"); foreach (TreeListNode node in tree.Nodes) { opreateRule(node); if (node.Nodes.Count > 0) { LoopTreeNodes(node, opreateRule); } } } /// <summary> /// 递归遍历TreeListNode节点 /// </summary> /// <param name="node"></param> /// <param name="opreateRule"></param> public static void LoopTreeNodes(this TreeListNode node, Action<TreeListNode> opreateRule) { if (node == null) throw new ArgumentNullException("node"); foreach (TreeListNode _childNode in node.Nodes) { opreateRule(_childNode); LoopTreeNodes(_childNode, opreateRule); } } /// <summary> /// 递归遍历TreeListNode,当opreateRule返回false停止循环 /// </summary> /// <param name="node">TreeListNode</param> /// <param name="opreateRule">Func<TreeListNode, bool></param> public static void LoopTreeNodes_Break(this TreeListNode node, Func<TreeListNode, bool> opreateRule) { if (node == null) throw new ArgumentNullException("node"); foreach (TreeListNode _childNode in node.Nodes) { if (!opreateRule(_childNode)) break; LoopTreeNodes_Break(_childNode, opreateRule); } } /// <summary> /// 递归遍历TreeListNode,当opreateRule返回false跳出循环，直接进入下次循环 /// </summary> /// <param name="node">TreeListNode</param> /// <param name="opreateRule">Func<TreeListNode, bool></param> public static void LoopTreeNodes_Continue(this TreeListNode node, Func<TreeListNode, bool> opreateRule) { if (node == null) throw new ArgumentNullException("node"); foreach (TreeListNode _childNode in node.Nodes) { if (!opreateRule(_childNode)) continue; LoopTreeNodes_Continue(_childNode, opreateRule); } } public delegate bool CheckNodeRule(TreeListNode fucusedNode); public delegate void CheckNodeNullRule(); /// <summary> /// 节点为null检查 /// </summary> /// <param name="fucusedNode">TreeListNode</param> /// <param name="checkNodeRule">若为NULL,处理逻辑</param> /// <returns>TreeListNode</returns> public static TreeListNode CheckNull(this TreeListNode fucusedNode, CheckNodeNullRule checkNodeRule) { if (fucusedNode == null) { checkNodeRule(); return null; } return fucusedNode; } /// <summary> /// 正对节点的检查逻辑 /// </summary> /// <param name="fucusedNode">TreeListNode</param> /// <param name="checkNodeRule">检查逻辑代码[委托]</param> /// <returns>TreeListNode</returns> public static TreeListNode Check(this TreeListNode fucusedNode, CheckNodeRule checkNodeRule) { if (fucusedNode != null) return checkNodeRule(fucusedNode) == true ? fucusedNode : null; return null; } /// <summary> /// 水平滚动条 /// </summary> /// <param name="tree">TreeList</param> public static void HorzScroll(this TreeList tree) { if (tree == null) throw new ArgumentNullException("tree"); tree.OptionsView.AutoWidth = false; tree.BestFitColumns(); tree.HorzScrollVisibility = ScrollVisibility.Always; } /// <summary> /// 为TreeList附加右键菜单 /// MouseUp(object sender, MouseEventArgs e)事件中调用 /// </summary> /// <param name="tree">TreeList</param> /// <param name="e">MouseEventArgs</param> /// <param name="menu">PopupMenu</param> /// <param name="attachMenuRule">AttachMenuRule</param> public static void AttachMenu(this TreeList tree, MouseEventArgs e, PopupMenu menu, Func<TreeListNode, bool> attachMenuRule) { if (tree == null) throw new ArgumentNullException("tree"); if (menu == null) throw new ArgumentNullException("menu"); if (e.Button == MouseButtons.Right && Control.ModifierKeys == Keys.None && tree.State == TreeListState.Regular) { Point _point = new Point(Cursor.Position.X, Cursor.Position.Y); TreeListHitInfo _hitInfo = tree.CalcHitInfo(e.Location); if (_hitInfo.HitInfoType == HitInfoType.Cell) tree.SetFocusedNode(_hitInfo.Node); if (attachMenuRule(tree.FocusedNode)) menu.ShowPopup(_point); } } /// <summary> /// 设置父节点的状态AfterCheckNode(object sender, NodeEventArgs e) /// </summary> /// <param name="node"></param> /// <param name="check"></param> public static void ProcessNodeCheckState(this TreeListNode node, CheckState check) { if (node == null) throw new ArgumentNullException("node"); SetCheckedChildNodes(node, check); SetCheckedParentNodes(node, check); } /// <summary> /// 设置子节点CheckState /// </summary> /// <param name="node"></param> /// <param name="check"></param> private static void SetCheckedChildNodes(TreeListNode node, CheckState check) { if (node != null) { node.LoopTreeNodes((TreeListNode _node) => { _node.CheckState = check; }); } } /// <summary> /// 设置父节点CheckState /// </summary> /// <param name="node"></param> /// <param name="check"></param> private static void SetCheckedParentNodes(TreeListNode node, CheckState check) { if (node.ParentNode != null) { bool _checkStatus = false; CheckState _nodeState; node.LoopTreeNodes_Break((TreeListNode _node) => { _nodeState = _node.CheckState; if (!check.Equals(_nodeState)) { _checkStatus = !_checkStatus; return false;//跳出循环 } return true;//继续循环 }); node.ParentNode.CheckState = _checkStatus ? CheckState.Indeterminate : check; SetCheckedParentNodes(node.ParentNode, check); } } /// <summary> /// 根据CheckState获取TreeListNode /// </summary> /// <param name="tree">TreeList</param> /// <param name="state">CheckState</param> /// <param name="GetNodesByStateRule">返回True的时候继续</param> /// <returns>TreeListNode集合</returns> public static List<TreeListNode> GetNodesByState(this TreeList tree, CheckState state, Func<TreeListNode, bool> GetNodesByStateRule) { if (tree == null) throw new ArgumentNullException("tree"); List<TreeListNode> _checkNodes = new List<TreeListNode>(); tree.LoopTree((TreeListNode node) => { if (GetNodesByStateRule(node)) { if (node.CheckState == state) _checkNodes.Add(node); } }); return _checkNodes; } } }
本文实例备有详尽的注释，可以帮助大家更好的加以理解。
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