TreeView 操作应用

1 在窗体Form_Load里面初始化TreeView
    /**//// <summary>
        /// 初始化TreeView
        /// </summary>
        private void InitTreeview()
        {
            try
            {
                treeView1.CheckBoxes = true;
                treeView1.Nodes.Clear();
                dt_menu=new DataTable("dt_rightTable");                
                dt_menu.Columns.Add("ID", typeof(String));
                dt_menu.Columns.Add("RightName", typeof(String));
                dt_menu.Columns.Add("ParentID", typeof(String));    

                DataRow dr;
                增加权限数据表增加权限数据表
                AddTree(0, (TreeNode)null);
                             
            }
            catch (Exception exc)
            {
                MessageBox.Show(exc.Message);
            }
        }
其中用到方法：
    /**//// <summary>
        ///  递归添加树的节点
        /// </summary>
        /// <param name="ParentID">父节点ID</param>
        /// <param name="pNode">节点</param>
        public void AddTree(int ParentID,TreeNode pNode) 
        {
            DataView dvTree = new DataView(dt_menu);
            dvTree.RowFilter =  "[ParentID] = " + ParentID;
            foreach(DataRowView Row in dvTree) 
            {
                TreeNode Node=new TreeNode() ;

                TreeNode node_temp=new TreeNode();

                if(pNode == null) 
                {
                    //增加根节点
                    node_temp.Text =Row["RightName"].ToString();
                    node_temp.Tag =Row["ID"].ToString();
                    treeView1.Nodes.Add(node_temp);
                    AddTree(Int32.Parse(Row["ID"].ToString()),node_temp);    //再次递归
                }
                else
                {
                    node_temp.Text =Row["RightName"].ToString();
                    node_temp.Tag =Row["ID"].ToString();
                    pNode.Nodes.Add(node_temp);
                    AddTree(Int32.Parse(Row["ID"].ToString()),node_temp);    //再次递归
                }
            }            
        }

在TreeView的AfterCheck事件里面编写如下代码：
    private void treeView1_AfterCheck(object sender, System.Windows.Forms.TreeViewEventArgs e)
        {
            //单击了treeView控件所触发的事件
            //MessageBox.Show(e.Node.Index.ToString());
            //如果夫节点下面有子节点则全部选中
            if(e.Action != TreeViewAction.Unknown)
            {
                if(e.Node.Nodes.Count > 0)
                {
                    this.CheckAllChildNodes(e.Node, e.Node.Checked);
                }
                //如果选中子节点同时选中父节点
                if(e.Node.Checked == true)
                {
                    this.selectParent(e.Node);
                }
                //如果取消子选择子节点，而且当所有本及子节点未选中时，取消父级节点
                if(e.Node.Checked == false)
                {
                    this.cancelParent(e.Node);
                
                }
            }                
        }

使用到的方法：
    public void CheckAllChildNodes(TreeNode treeNode, bool nodeChecked)
        {
            foreach(TreeNode node in treeNode.Nodes)
            {
                node.Checked = nodeChecked;
                if(node.Nodes.Count > 0)
                {
                    this.CheckAllChildNodes(node, nodeChecked);
                }
            }
        }

        //取消上级节点
        private void cancelParent(TreeNode node)
        {
            if(node.Parent != null)
            {
                bool isCheck = false;
                foreach(TreeNode n in node.Parent.Nodes)
                {
                    if(n.Checked == true)
                        isCheck = true;
                }
                if(!isCheck)
                    node.Parent.Checked = false;
            }
        }
        
        //设置选中父节点
        private void selectParent(TreeNode node)
        {
            if(node.Parent != null && node.Parent.Checked == false)
            {
                node.Parent.Checked = true;
                if(node.Parent.Parent != null)
                    this.selectParent(node.Parent);
            }
        }
取消TreeView里面所有的钩
    private void simpleButton4_Click(object sender, System.EventArgs e)
        {
            System.Windows.Forms.TreeNodeCollection nodes=treeView1.Nodes;
            ClearSelectTree(nodes);
        }    //清除所有打勾选项
        private void ClearSelectTree(System.Windows.Forms.TreeNodeCollection nodes)
        {            
            foreach(System.Windows.Forms.TreeNode node in nodes) 
            {  
                node.Checked =false;                
                ClearSelectTree(node.Nodes); //递归查找                 
            } 
        }
给每个TreeView里面节点的Tag加str_right  这里str_right是全局变量
            GetAllNode(treeView1.Nodes);遍历所有的节点：
    /**//// <summary>
        /// 遍历treeview  调用GetAllNode(treeView1.Nodes)
        /// </summary>
        /// <param name="nodes"></param>
        private void GetAllNode(System.Windows.Forms.TreeNodeCollection nodes) 
        { 
            foreach(System.Windows.Forms.TreeNode node in nodes) 
            {  
                if (node.Checked)
                {
                    if (str_right!="")
                    {
                        str_right+=";"+node.Tag.ToString();
                    }
                    else
                    {
                        str_right=node.Tag.ToString();
                    }                    
                }
                GetAllNode(node.Nodes); //递归查找 
                
            } 
        } 
下面判断是否打钩
treeView1.Nodes[Convert.ToInt32(ch_array[0].ToString())-1].Nodes[Convert.ToInt32(ch_array[1].ToString())-1].Checked=true;

posted on 2006-12-18 17:29  玄新  阅读(252)  评论(0)  编辑  收藏  举报

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