递归方法实现TreeView控件的绑定

                           递归方法实现TreeView控件的绑定
    protected void Page_Load(object sender, EventArgs e)
    {
        if (this.Page.IsPostBack)
            return;
        TreeNode node=new TreeNode();  
        node.Text = "中国";
        node.Value = "-1";
        TreeView1.DataSource = null; // TreeView1为空
        TreeView1.Nodes.Add(node);
        TreeView1.CollapseAll();
        bindTreeView(0, node);
    }

    #region 绑定数据
    // 入口 条件  自调用  

    private void bindTreeView(int parentID,TreeNode nodes)
    {
        province pClass = new province();
        pClass.ID = parentID.ToString();
        string sql = "select *from province where code='"+pClass.ID"'";
        DataSet ds = SqlFunction.returnDataSet(sql);

        TreeNode node;
        for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
        {
            node = new TreeNode();
            node.Text = ds.Tables[0].Rows[i]["name"].ToString();
            node.Value = ds.Tables[0].Rows[i]["id"].ToString();
            nodes.ChildNodes.Add(node);
            bindTreeView(Convert.ToInt32(ds.Tables[0].Rows[i]["id"]),node);
        }
    }

    #endregion

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

///导入命名空间
using System.Web.UI.WebControls;

/// <summary>
/// Summary description for TreeViewDataLevelDisplay
/// </summary>
public class TreeViewDataLevelDisplay
{
    #region 声明全局变量
    Softwaretailor.LMS.Model.Department model = new Softwaretailor.LMS.Model.Department();
    #endregion

    public TreeViewDataLevelDisplay()
    {
        //
        // TODO: Add constructor logic here
        //
    }

    /// <summary>
    /// 实现树形控件的数据绑定
    /// </summary>
    /// <param name="treeView">树形控件</param>
    /// <param name="parentId">父级编号</param>
    public static void TreeViewDataBand(TreeView treeView,Guid parentId)
    {
        treeView.Nodes.Clear();
        List<Softwaretailor.LMS.Model.Department> list = Softwaretailor.LMS.BLL.Department.GetListByParentId(parentId, " CreatedDate ASC ");
        TreeNode node;

        if (list != null && list.Count > 0)
        {
            foreach (Softwaretailor.LMS.Model.Department model in list)
            {
                node = new TreeNode();
                node.Text = model.DepartmentName;
                node.Value = model.DepartmentID.ToString();
                GetTreeViewDataLevelDisplay(model.DepartmentID, node);
                treeView.Nodes.Add(node);
            }
        }

    }

    /// <summary>
    /// 实现树形控件级别显示数据
    /// </summary>
    /// <param name="parentId">父级编号</param>
    /// <param name="nodes">树形节点</param>
    public static void GetTreeViewDataLevelDisplay(Guid parentId, TreeNode nodes)
    {
        List<Softwaretailor.LMS.Model.Department> list = new List<Softwaretailor.LMS.Model.Department>();
        list = Softwaretailor.LMS.BLL.Department.GetListByParentId(parentId, " CreatedDate ASC ");
        if (list == null || list.Count == 0)
        {
            return;
        }
        TreeNode node;
        foreach (Softwaretailor.LMS.Model.Department model in list)
        {
            node = new TreeNode();
            node.Text = model.DepartmentName;
            node.Value = model.DepartmentID.ToString();
            nodes.ChildNodes.Add(node);
            GetTreeViewDataLevelDisplay(model.DepartmentID, node);
        }
    }

}