TreeView控件如何设置节点显示与隐藏，主要是用来做后台权限，没有权限的就隐藏，有权限的就显示？

原文来自：http://wenwen.soso.com/z/q104168454.htm

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// TreeManage 的摘要说明
/// </summary>
public class TreeManage
{
    public TreeManage()
    {
       
    }

    //创建树
    public void CreateTree(TreeView view, string RoleId)
    {
        CreateModule(view, RoleId);
    }
    //创建根结点
    private void CreateModule(TreeView view, string RoleId)
    {
        Bll.ModuleBll mod = new Bll.ModuleBll();
        DataTable dt = mod.SearchAllModule();
        foreach (DataRow dr in dt.Rows)
        {
            TreeNode node = new TreeNode();
            node.Text = dr["modName"].ToString();
            node.Value = dr["modId"].ToString();
            view.Nodes.Add(node);
            node.Checked = CheckModuleRights(RoleId, dr["modId"].ToString());
            CreatePage(node, RoleId);  //生成某个模块节点的子节点
        }
    }
    private void CreatePage(TreeNode node, string RoleId)
    {
        Bll.ItempBll bi = new Bll.ItempBll();
        DataTable dt = bi.SearchAllPage(node.Value);
        foreach (DataRow dr in dt.Rows)
        {
            TreeNode cnode = new TreeNode();
            cnode.Text = dr["itemName"].ToString();
            cnode.Value = dr["itemId"].ToString();
            node.ChildNodes.Add(cnode);
            cnode.Checked = CheckPageRights(RoleId, dr["itemId"].ToString());
        }
    }

    private bool CheckModuleRights(string RoleId, string ModuleId)
    {
        Bll.ClerkModuleBll bcm = new Bll.ClerkModuleBll();
        DataTable dt = bcm.SearchModuleRight(ModuleId, RoleId);
        if (dt.Rows.Count > 0)
        {
            return true;
        }
        return false;
    }
    private bool CheckPageRights(string RoleId, string PageId)
    {
        Bll.ClerkItemBll bci = new Bll.ClerkItemBll();
        DataTable dt = bci.SearchPageRight(PageId, RoleId);
        if (dt.Rows.Count > 0)
        {
            return true;
        }
        return false;
    }

    public void CreateRights(TreeView view, string RoleId)
    {
        new Bll.ClerkItemBll().Delete(RoleId);
        new Bll.ClerkModuleBll().Delete(RoleId);
        CreateModuleRights(view, RoleId);
    }
    private void CreateModuleRights(TreeView view, string RoleId)
    {
        foreach (TreeNode node in view.Nodes)
        {
            Bll.ClerkModuleBll module = new Bll.ClerkModuleBll();
            if (node.Checked == true)
            {
                //分配模块的权限
                module.Insert(RoleId, node.Value);
                CreatePageRights(node, RoleId);
            }
        }
    }
    private void CreatePageRights(TreeNode node, string RoleId)
    {
        Bll.ClerkItemBll item = new Bll.ClerkItemBll();
        foreach (TreeNode cnode in node.ChildNodes)
        {
            if (cnode.Checked == true)
            {
                item.Insert(RoleId, cnode.Value);
            }
        }

    }
}