动态加载树技术详解

MasterPage.master <asp:TreeView ID="tvUserRightMenu" runat="server" BackColor="#F8B109" ExpandImageUrl="~/images/menuopen.gif" ShowLines="True"> </asp:TreeView> public partial class MasterPage : System.Web.UI.MasterPage { LoginManage lm = new LoginManage(); UserManage um = new UserManage(); MemberManage mm = new MemberManage(); protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { string userId = Session["userid"].ToString();//获得用户的登陆id DisplayUserInfo(userId);//初始化用户基本信息 DisplayUserMenu(userId);//显示该用户拥有权限的功能菜单 DataTable dataTablePostUntreadInfo = mm.GetPostFailedInfoDataTable(userId); if (dataTablePostUntreadInfo.Rows.Count > 0) { imgNew.Visible = true; string postHistoryId = dataTablePostUntreadInfo.Rows[0]["posthistoryid"].ToString(); imgNew.Attributes.Add("OnClick", "ScanPostDetail('1','" + postHistoryId + "');"); } else { imgNew.Visible = false; } } } /// <summary> /// 显示该用户基本信息 /// </summary> /// <param name="userId">用户id</param> protected void DisplayUserInfo(string userId) { DataTable dataTableUserInfo = um.GetUserInfoByUserId(userId);//根据用户id获得用户信息表 foreach (DataRow dr in dataTableUserInfo.Rows) { this.lblUserId.Text = dr["userid"].ToString(); this.lblUserName.Text = dr["username"].ToString(); this.lblUserMoney.Text = dr["money"].ToString(); this.lblUserType.Text = dr["rolename"].ToString(); } } /// <summary> /// 创建第一层节点 /// </summary> /// <param name="userId"></param> public void DisplayUserMenu(string userId) { tvUserRightMenu.Nodes.Clear();//避免重复加载节点，先清除所有节点 DataTable dataTableUserFatherNode = lm.GetUserRightDataTable(userId,"0");//获得所有第一层节点 foreach (DataRow dr in dataTableUserFatherNode.Rows) { string menuId = dr["nodeid"].ToString();//第一层节点id string menuName = dr["displayname"].ToString();//第一层节点显示名称 TreeNode fatherNode = this.CreatTreeNode(menuName, menuId, "", "Images/menuclose.gif");//根据节点信息，创建第一层节点 if (dataTableUserFatherNode.Rows.Count > 0) { SerCreateTree(userId,menuId, fatherNode);//创建子节点 } tvUserRightMenu.Nodes.Add(fatherNode);//将第一层节点加入到用户权限TreeView中 } } //创建第二层结点 private void SerCreateTree(string userId,string menuId, TreeNode fatherNode) { DataTable dataTableUserChildNode = lm.GetUserRightDataTable(userId, menuId);//获得menuId节点的所有子节点 foreach (DataRow dr in dataTableUserChildNode.Rows) { string childMenuId = dr["nodeid"].ToString();//第二层节点id string childMenuName = dr["displayname"].ToString();//第二层节点名称 string nodeURL = ResolveUrl(dr["NodeUrl"].ToString().Trim());//将路径转换为在客户端可用的URL TreeNode childNode = this.CreatTreeNode(childMenuName, childMenuId, nodeURL, "Images/CloseTree.gif");//根据节点信息，创建第二层节点 AddTree(fatherNode, childNode);//将子节点加入到父节点中 } } /// <summary> /// 创建一个树节点,返回一个树节点对象，参数内容是： /// 节点名称，节点ID，链接地址，正常图标，展开后的图标 /// </summary> private TreeNode CreatTreeNode(string strText, string strId, string strUrl, string strImg) { TreeNode newNode = new TreeNode(); newNode.Text = strText; newNode.Value = strId; newNode.NavigateUrl = strUrl; newNode.ImageUrl = strImg; return newNode; } /// <summary> /// 把子节点添加到父节点当中 /// </summary> private void AddTree(TreeNode FatherNode, TreeNode ChildNode) { FatherNode.ChildNodes.Add(ChildNode); } protected void btnLeave_ServerClick(object sender, EventArgs e) { string strLogin = ResolveUrl("ReLogin.aspx");//将路径转换为在客户端可用的URL Response.Redirect(strLogin); } } BLL LoginManage.cs GetUserRightDataTable() /// <summary> /// 自定义-获得用户权限信息表 /// </summary> public DataTable GetUserRightDataTable(string userId, string ParentId) { DataTable userRightDataTable = sda.GetUserRightInfoDataTable(userId, ParentId); if (userRightDataTable == null) { this.errMessage = "您还没有通过审核，请等待管理员审核后登陆！"; return userRightDataTable; } else { return userRightDataTable; } } DAL /// <summary> /// 自定义-获得用户权限信息 /// </summary> public DataTable GetUserRightInfoDataTable(string userId, string ParentId) { string sql = "select * from viewUserRight where userid='" + userId + "' and parentnodeid='" + ParentId + "'"; try { DataTable userRightDataTable = dbo.ExecQuery(sql); return userRightDataTable; } catch { return null; } }