前几天在木野狐老大的园子里逛,见了新出的贴子《一个快捷访问 TreeView 控件节点的帮助类》,受到其中的代码启发。借老大的代码过来。自己改了改,将节点遍历的过程分离出来。做成了两个虚函数。我们可以在遍历的过程中。做更多的工作,而我们使用的方法,就是继承这个类。并重写这两个虚函数就可以,基于本人是菜鸟级的原因,代码可能不是很好。请各位前辈不吝指教。
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Windows.Forms.ComponentModel;
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using System.Windows.Forms;
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namespace TreeNodeCatch
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{
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public class TreeNodeAccess
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{
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private TreeView _TreeView;
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private TreeNode _TreeNode;
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private List<TreeNode> nodes;
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private delegate void SetEachNode(TreeNode tn);
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private event SetEachNode OnGetEachNode;
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private delegate void EndEachAction();
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private event EndEachAction OnGetAllNode;
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protected TreeNodeAccess() { }
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public TreeNodeAccess(TreeView treeview)
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{
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_TreeView = treeview;
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}
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public TreeNodeAccess(TreeNode treenode)
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{
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_TreeNode = treenode;
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}
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private void Walk(TreeNode node)
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{
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if (node == null)
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{
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nodes.Add(_TreeView.Nodes[0]);
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foreach (TreeNode childNode in _TreeView.Nodes[0].Nodes)
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{
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Walk(childNode);
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}
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}
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else
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{
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nodes.Add(node);
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foreach (TreeNode childNode in node.Nodes)
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{
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Walk(childNode);
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}
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}
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}
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private IEnumerable<TreeNode> GetAllTreeNodes()
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{
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nodes = new List<TreeNode>();
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Walk(null);
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foreach (TreeNode node in nodes)
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{
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yield return node;
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}
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}
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private IEnumerable<TreeNode> GetAllTreeNodes(TreeNode TreeNode)
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{
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nodes = new List<TreeNode>();
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Walk(TreeNode);
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foreach (TreeNode node in nodes)
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{
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yield return node;
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}
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}
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public virtual int MaxLen
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{
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get
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{
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List<TreeNode> Tmp = nodes;
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Tmp.Sort(delegate(TreeNode a, TreeNode b) { return -a.Level.CompareTo(b.Level); });
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int Max = Tmp[0].Level;
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Tmp = null;
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return Max;
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}
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}
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private void Action(TreeNodeAccess ClassName)
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{
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IEnumerable<TreeNode> nodes;
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if (_TreeView != null)
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{
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nodes = GetAllTreeNodes();
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}
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else
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{
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nodes = GetAllTreeNodes(_TreeNode);
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}
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foreach (TreeNode node in nodes)
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{
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if (OnGetEachNode != null)
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{
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OnGetEachNode(node);
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ClassName.OnGetEachNode(node);
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}
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}
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if (OnGetAllNode!= null)
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{
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OnGetAllNode();
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ClassName.OnGetAllNode();
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}
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}
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public bool SearchNode(string value,SearchMode Mode)
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{
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TreeNode Res;
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TreeView MyTree;
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if (_TreeNode != null)
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{
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MyTree =_TreeNode.TreeView;
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}
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else
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{
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MyTree = _TreeView;
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}
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switch (Mode)
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{
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case SearchMode.ByText:
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{
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Res = nodes.Find(delegate(TreeNode tn) { return tn.Text ==value; });
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break;
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}
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case SearchMode.ByName:
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{
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Res = nodes.Find(delegate(TreeNode tn) { return tn.Name == value ; });
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break;
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}
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default:
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{
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Res = null;
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break;
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}
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}
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if (Res != null)
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{
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MyTree.SelectedNode = Res;
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Res.Parent.Expand();
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return true;
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}
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else
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{
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return false;
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}
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}
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public virtual void Execute(TreeNode Node){}
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public virtual void FinishGetNode(){}
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public void Load(TreeNodeAccess ClassName)
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{
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OnGetAllNode += new EndEachAction(FinishGetNode);
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OnGetEachNode += new SetEachNode(Execute);
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ClassName.OnGetAllNode += new EndEachAction(ClassName.FinishGetNode);
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ClassName.OnGetEachNode += new SetEachNode(ClassName.Execute);
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Action(ClassName);
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}
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}
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public enum SearchMode
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{ByText,ByName}
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}
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其中Execute虚函数是遍历每一个节点时触发的过程。FineshGetNode是完成了遍历完所有节点后触发的过程,TreeNodeAccess类可以用TreeView和TreeNode来初始化。