C# TreeView --TvHelper

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using System; using System.Collections.Generic; using System.Linq; using System.Runtime.CompilerServices; using System.Text; using System.Windows.Forms;   namespace RF.Sys.Helper {     public class TvHelper     {         //定义一个用于保存静态变量的实例         private static TvHelper instance = null;         //定义一个保证线程同步的标识         private static readonly object locker = new object();         //构造函数为私有，使外界不能创建该类的实例         private TvHelper() { }         public static TvHelper Instance         {             get             {                 if (instance == null)                 {                     lock (locker)                     {                         if (instance == null) instance = new TvHelper();                     }                 }                 return instance;             }         }           public void CheckParentNode(TreeNode node)         {             if (node.Parent != null)             {                 if (node.Checked)                 {                     node.Parent.Checked = node.Checked;                     CheckParentNode(node.Parent);                 }                 else                 {                     bool select = false;                     foreach (TreeNode temp in node.Parent.Nodes)                     {                         select = select | temp.Checked;                     }                     if (select) node.Parent.Checked = true;                     else node.Parent.Checked = false;                     CheckParentNode(node.Parent);                 }             }         }           public void CheckChildNode(TreeNode node)         {             if (node.Nodes.Count <= 0) return;               foreach (TreeNode temp in node.Nodes)             {                 temp.Checked = node.Checked;                 CheckChildNode(temp);             }         }     } }

使用方式：使用右键快捷菜单实现。。。。。。

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#region tv event        private void btnCloseAllNode_Click(object sender, EventArgs e)        {            if (btnCloseAllNode.Text == "折叠所有节点")            {                this.tvCase.CollapseAll();                btnCloseAllNode.Text = "展开所有节点";            }            else            {                this.tvCase.ExpandAll();                btnCloseAllNode.Text = "折叠所有节点";            }        }          private void btnCloseBandNode_Click(object sender, EventArgs e)        {            btnCloseBandNode.Text = "展开所有节点";            foreach (TreeNode networknode in this.tvCase.Nodes)            {                foreach (TreeNode bandnode in networknode.Nodes)                {                    bandnode.Collapse();                }            }        }          private void tvCase_AfterSelect(object sender, TreeViewEventArgs e)        {            TreeNode node = (TreeNode)e.Node;            node.SelectedImageIndex = node.ImageIndex;        }          private void tvCase_AfterCheck(object sender, TreeViewEventArgs e)        {            TreeNode checknode = e.Node;            if (e.Action != TreeViewAction.Unknown)            {                TvHelper.Instance.CheckChildNode(checknode);                TvHelper.Instance.CheckParentNode(checknode);            }        }          #endregion