《转》---使用递归方法DataTable 绑定 TreeView

转自：http://blog.sina.com.cn/s/blog_8944756d01016yaj.html

前台：

<asp:View ID="view0" runat="server">
                <asp:TreeView ID="treeLanMu" runat="server" ImageSet="Arrows"
                    onselectednodechanged="treeLanMu_SelectedNodeChanged"  >
                </asp:TreeView>
            </asp:View>

 

后台：

 /// <summary> 
        /// 递归绑定子节点 
        /// </summary> 
        /// <param name="dt">作为数据源的DataTable</param> 
        /// <param name="tnc">该节点的子节点集合</param> 
        /// <param name="pid_val">该节点的父节点值</param> 
        /// <param name="id_Name">DataTable中id字段的名称</param> 
        /// <param name="pid_Name">DataTable中父id字段的名称</param> 
        /// <param name="text_Name">DataTable中name字段的名称</param> 
        private void BindTreeView(DataTable dt, TreeNodeCollection tnc, string pid_val, string id_Name, string pid_Name, string text_Name)
        {
            dt = GetAllLanmu();
            DataView dv = new DataView(dt);//将DataTable存到DataView中，以便于筛选数据 
            TreeNode tn;//建立TreeView的节点（TreeNode），以便将取出的数据添加到节点中 
            //以下为三元运算符，如果父id为空，则为构建“父id字段 is null”的查询条件，否则构建“父id字段=父id字段值”的查询条件 
            string filter = string.IsNullOrEmpty(pid_val) ? pid_Name + " is null" : string.Format(pid_Name + "='{0}'", pid_val);
            dv.RowFilter = filter;//利用DataView将数据进行筛选，选出相同 父id值 的数据 
            foreach (DataRowView drv in dv)
            {
                tn = new TreeNode();//建立一个新节点 
                tn.Value = drv[id_Name].ToString();//节点的Value值，一般为数据库的id值 
                tn.Text = drv[text_Name].ToString();//节点的Text，节点的文本显示 
                tnc.Add(tn);//将该节点加入到TreeNodeCollection（节点集合）中 
                BindTreeView(dt, tn.ChildNodes, tn.Value, id_Name, pid_Name, text_Name);//递归（反复调用这个方法，直到把数据取完为止） 
            }
        }

 

 

调用：

         DataTable dtGetN = db.GetAllLanmu();
             BindTreeView(dtGetN, treeLanMu.Nodes, null, "lindex", "parentindex", "lname");
             treeLanMu.ExpandAll();

 

另一种方法：

 

 private void BindTreeView()

        {

            treeLanMu.Nodes.Clear();

            DataTable dtpindex = db.GetAllByParentIndex("-1");

            TreeNode unitNode = new TreeNode();

            if (dtpindex.Rows.Count!=0)

            {

 

                for (int i = 0; i < dtpindex.Rows.Count; i++)

                {

                    string Pname = dtpindex.Rows[i]["lname"].ToString();

                    unitNode.Text = Pname;

                    treeLanMu.Nodes.Add(unitNode);

                    BindDepartmentTree(dtpindex.Rows[i]["lindex"].ToString(), unitNode);

                }

            }

 

        }

 

        private void BindDepartmentTree(string parentId, TreeNode node)

        {

            DataTable dt = db.GetAllByParentIndex(parentId);

            for (int i = 0; i < dt.Rows.Count; i++)

            {

                string id = dt.Rows[i]["lindex"].ToString();

                string name = dt.Rows[i]["lname"].ToString();

                TreeNode snode = new TreeNode(name);

                snode.Value = id;

                node.ChildNodes.Add(snode);

                BindDepartmentTree(id, snode);

            }

 

        }

转载于:https://www.cnblogs.com/hiflora/p/3158793.html