winform TreeView的一些用法以及异步加载

今天，主要弄了一下对于树型控件的一些方法，以及异步加载。
参考：

http://www.cnblogs.com/greatverve/archive/2012/03/23/winform-treeview.html

下面是TreeView的一些用法

private void BindTreeView()

{

    treeView1.LabelEdit = false;//不可编辑

    //添加结点

    TreeNode root = new TreeNode();

    root.Text = "根节点";

    //一级

    TreeNode node1 = new TreeNode();

    node1.Text = "1";

    TreeNode node2 = new TreeNode();

    node2.Text = "2";

    //二级

    TreeNode node11 = new TreeNode();

    node11.Text = "11";

    TreeNode node12 = new TreeNode();

    node12.Text = "12";

    TreeNode node21 = new TreeNode();

    node21.Text = "21";

    TreeNode node22 = new TreeNode();

    node22.Text = "22";

    //二级加入一级

    node1.Nodes.Add(node11);

    node1.Nodes.Add(node12);

    node2.Nodes.Add(node21);

    node2.Nodes.Add(node22);

    //一级加入根

    root.Nodes.Add(node1);

    root.Nodes.Add(node2);

    //

    treeView1.Nodes.Add(root);

}

private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)

{

    if (treeView1.SelectedNode != null)

    {

        MessageBox.Show(treeView1.SelectedNode.Text);

    }

}

基本用法有了，下面，就把我写的异步加载列表的方法写进去了，因为是参考网上的方法临时 写的，可能会有些不足之处，也有可以改进，优化的一些方法

 DataTable dt = data.createDT();

        #region 树的异步加载

        /// <summary>

        /// 载入根节点

        /// </summary>

        public void make_rootView()

        {



            foreach (DataRow row in dt.Select("module_fatherid='M01'"))

            {

                TreeNode tn = new TreeNode();

                string sk=row["module_id"].ToString();

                tn.Text = row["module_name"].ToString();

                treeView1.Nodes.Add(tn);

                DataRow[] row2=(dt.Select("module_fatherid='" + sk + "'"));

                if (row2.Count()!=0)

                {

                    

                    TreeNode tn1 = new TreeNode();

                    tn1.Text = "";

                    tn.Nodes.Add(tn1);

                }

            }

        }

        /// <summary>

        /// 载入子节点

        /// </summary>

        /// <param name="node_id"></param>

        /// <param name="node"></param>

        public void make_view(string node_id,TreeNode node)

        {

            node.Nodes.Clear();

            foreach (DataRow row in dt.Select("module_fatherid='"+node_id+"'"))

            {

                TreeNode tn = new TreeNode();

                string sk = row["module_id"].ToString();

                tn.Text = row["module_name"].ToString();

                node.Nodes.Add(tn);



                if ((dt.Select("module_fatherid='" + sk + "'")).Count() != 0)

                {

                    TreeNode tn1 = new TreeNode();

                    tn1.Text = "";

                    tn.Nodes.Add(tn1);

                }

            }

        }

        /// <summary>

        /// 查找父节点的ID

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        public void make_NodeView(object sender, TreeViewCancelEventArgs e)

        {

            TreeNode tn = e.Node;

            string node_id = "";

            foreach (DataRow row in dt.Select("module_name='" + tn.Text + "'"))

            {

                node_id = row["module_id"].ToString();

            }

            make_view(node_id, tn);

        }

        #endregion



        private void treeView1_BeforeExpand(object sender, TreeViewCancelEventArgs e)

        {

            make_NodeView(sender, e);

            

        }

在刚载入时调用 

 private void Form1_Load(object sender, EventArgs e)

        {           make_rootView();   }

在树型控件的事件treeView1_BeforeExpand调用 

private void treeView1_BeforeExpand(object sender, TreeViewCancelEventArgs e)

        { make_NodeView(sender, e);   }

下面是我的数据源，我是根据下面这个表格的结构来写代码 ，根据结构的不一样，代码 也应做相应的改变

public class data

    {

        public static DataTable createDT()

        {

            DataTable dt = new DataTable();

            dt.Columns.Add("module_id");

            dt.Columns.Add("module_name");

            dt.Columns.Add("module_fatherid");

            dt.Columns.Add("module_url");

            dt.Columns.Add("module_order");



            dt.Rows.Add("C1", "全国", "0", "", "1");

            dt.Rows.Add("M01", "广东", "C1", "", "1");



            dt.Rows.Add("M0101", "深圳", "M01", "", "100");

            dt.Rows.Add("M010101", "南山区", "M0101", "", "1000");

            dt.Rows.Add("M010102", "罗湖区", "M0101", "", "1001");

            dt.Rows.Add("M010103", "福田区", "M0101", "", "1002");

            dt.Rows.Add("M010104", "宝安区", "M0101", "", "1003");

            dt.Rows.Add("M010105", "龙岗区", "M0101", "", "1004");



            dt.Rows.Add("M01010301", "上梅林", "M010103", "", "1002001");

            dt.Rows.Add("M01010302", "下梅林", "M010103", "", "1002002");

            dt.Rows.Add("M01010303", "车公庙", "M010103", "", "1002003");

            dt.Rows.Add("M01010304", "竹子林", "M010103", "", "1002004");

            dt.Rows.Add("M01010305", "八卦岭", "M010103", "", "1002005");

            dt.Rows.Add("M01010306", "华强北", "M010103", "", "1002006");



            dt.Rows.Add("M0102", "广州", "M01", "", "101");

            dt.Rows.Add("M010201", "越秀区", "M0102", "", "1105");

            dt.Rows.Add("M010202", "海珠区", "M0102", "", "1106");

            dt.Rows.Add("M010203", "天河区", "M0102", "", "1107");

            dt.Rows.Add("M010204", "白云区", "M0102", "", "1108");

            dt.Rows.Add("M010205", "黄埔区", "M0102", "", "1109");

            dt.Rows.Add("M010206", "荔湾区", "M0102", "", "1110");

            dt.Rows.Add("M010207", "罗岗区", "M0102", "", "1111");

            dt.Rows.Add("M010208", "南沙区", "M0102", "", "1112");

            return dt;

        }

    }

以上表结构是从网上摘录下来的！！！