C# winfrom动态加载TreeView控件

最新推荐文章于 2022-04-02 11:26:41 发布

bill_live

最新推荐文章于 2022-04-02 11:26:41 发布

阅读量141

点赞数

CC 4.0 BY-SA版权

文章标签：数据库

原文链接：http://www.cnblogs.com/wuhuisheng/archive/2012/03/29/2423659.html

本文介绍如何通过继承 .NET 的 TreeNode 类来自定义 TreeNode，并添加额外属性，例如控件类型和父 ID。此外，还展示了如何在点击事件中正确选择节点及如何从数据库动态加载 TreeView 控件。

如果需要给TreeNode绑定自己想要的属性解决办法？

自定义TreeNode 继承自.net的TreeNode后添加属性如：

       public class CustomTrNode : TreeNode
      {
        /// <summary>
        /// 属性1：控件类型
        /// </summary>
        public object ControlType { get; set; }

        /// <summary>
        /// 属性2：父ID
        /// </summary>
        public object ParentID { get; set; }
        }

在 NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)事件中如果 selectedNode==null的时候添加下面代码赋值

       if (e.Button == MouseButtons.Left && CustomerTreeView.GetNodeAt(e.X, e.Y) != null)
            { CustomerTreeView.SelectedNode = CustomerTreeView.GetNodeAt(e.X, e.Y); }
            CustomTrNode cuTrNode = (CustomTrNode)e.Node;

动态加载TreeView控件

       TreeView tree = new TreeView();
        private void Form1_Load(object sender, EventArgs e)
        {
           //读取数据库动态加载
            String connStr = @"Data Source=localhost; Initial Catalog=TreeDB;uid=sa;pwd=123456";
            SqlConnection conn = new SqlConnection(connStr);
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = "select * from TestInfo";
            SqlDataAdapter sda = new SqlDataAdapter(cmd);
             DataSet ds = new DataSet();
            try
            {

                sda.Fill(ds, "TestInfo");
            }
            catch (Exception ex)
            {

                return;
            }

            DataTable dt = ds.Tables[0];
            //初始化根节点
            initParent(dt);

            this.Controls.Add(tree);
            tree.Width = 258;
            tree.Height = 342;
            tree.Left = 282;
            tree.Top = 47;
        }

        //初始化根节点
        void initParent(DataTable dt)
        {
            DataRow[] drs = dt.Select("ParentID=0");
            foreach (DataRow dr in drs)
            {
                TreeNode tn = new TreeNode();
                tn.Text = dr["Name"].ToString();
                tn.Tag = dr["ID"].ToString();
                this.tree.Nodes.Add(tn );
                //初始化下级节点
                initLeaf(dt,tn );
            }

}

       //初始化下级节点
        void initLeaf(DataTable dt,TreeNode tn)
        {
            DataRow[] drs = dt.Select("ParentID="+tn.Tag as string );
            foreach (DataRow dr in drs)
            {
                TreeNode ctn = new TreeNode();
                ctn.Text = dr["Name"].ToString();
                ctn.Tag = dr["ID"].ToString();
                tn.Nodes.Add(ctn);

                //递归调用，不断循环至叶节点
                initLeaf(dt,ctn);
            }
        }
    }

转载于:https://www.cnblogs.com/wuhuisheng/archive/2012/03/29/2423659.html