TreeView的用法

TreeView是一个不错的控件，能够帮助我很好的完成部门树的功能，并且有展开收拢的功能。下面介绍如何使用。

首先在界面上放一个TreeView控件。

<asp:treeview ID="Treeview1" runat="server">
</asp:treeview>

编写递归方法

public void BuildTreeNode(string parentid, TreeNode tn,DataTable dtParam)//dtParam为所有的表信息，无需筛选。
        {
            DataTable currTable = new DataTable();
            currTable = dtParam.Clone();
            DataTable nextTable = new DataTable();
            nextTable = dtParam.Clone();
            for (int i = 0; i < dtParam.Rows.Count; i++)
            {
                if (dtParam.Rows[i][1].ToString() == parentid)
                {
                    currTable.Rows.Add(dtParam.Rows[i].ItemArray);
                }
                else
                {
                    nextTable.Rows.Add(dtParam.Rows[i].ItemArray);
                }
            }
            for (int j = 0; j <currTable.Rows.Count; j++)
            {
                DataRow dr = currTable.Rows[j];
                TreeNode mytn = new TreeNode();
                mytn.Text = dr[2].ToString();
                mytn.Value = dr[0].ToString();
                BuildTreeNode(dr[0].ToString(), mytn, nextTable);
                if (tn == null)
                {
                    Treeview1.Nodes.Add(mytn);
                }
                else
                {
                    tn.ChildNodes.Add(mytn);
                }
            }
        }

protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                DataTable dtParam = GetAllDeptInfo();
                TreeNode tn = null;
                BuildTreeNode("0", tn, dtParam);
                Treeview1.DataSource = tn;
                DropDownList1.DataSource = dtTree;
                Treeview1.DataBind();
            }
        }