TreeView控件树Demo 用DataTable绑定到TreeView

前台：

<form id="Form1" runat="server">
　　<asp:TreeView ID="TreeView1" runat="server">
　　</asp:TreeView>
</form>

后台：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

namespace TreeViewDemo
{
	public partial class _Default : System.Web.UI.Page
	{
		protected void Page_Load(object sender, EventArgs e)
		{
			if (!IsPostBack)
			{
				iniTree();
			}
		}

		private DataTable CreateData()
		{
			DataTable dt = new DataTable();
			dt.Columns.Add(new DataColumn("cName"));
			dt.Columns.Add(new DataColumn("cID"));
			dt.Columns.Add(new DataColumn("cPID"));

			for (int i = 0; i < 10; i++)
			{
				DataRow dr = dt.NewRow();
				dr["cName"] = "父节点" + i.ToString();
				dr["cID"] = i.ToString();
				dr["cPID"] = "";
				dt.Rows.Add(dr);

				for (int j = 0; j < 3; j++)
				{
					DataRow dr_sub = dt.NewRow();
					dr_sub["cName"] = "子节点" + j.ToString();
					dr_sub["cID"] = i.ToString() + "_" + j.ToString();
					dr_sub["cPID"] = i.ToString();
					dt.Rows.Add(dr_sub);
				}
			}

			return dt;
		}

		private void iniTree()
		{
			TreeView1.Nodes.Clear();

			DataTable dt = CreateData();
			TreeView1.Nodes.Add(new TreeNode("根节点", ""));
			bindTree(dt, "", TreeView1.Nodes[0]);

			TreeView1.ImageSet = TreeViewImageSet.Arrows;
		}

		private void bindTree(DataTable dt, string pid, TreeNode ParentNode)
		{
			DataRow[] Rows = GetData(dt, pid);
			if (Rows.Length == 0) { return; }

			foreach (DataRow r in Rows)
			{
				TreeNode node = new TreeNode(r["cName"].ToString(),r["cID"].ToString());

				ParentNode.ChildNodes.Add(node);

				bindTree(dt, r["cID"].ToString(), node);
			}
		}

		private DataRow[] GetData(DataTable dt, string pid)
		{
			IEnumerable<DataRow> query = from r in dt.AsEnumerable()
						where r.Field<string>("cPID") == pid
						select r;
			return query.ToArray<DataRow>();
		}
	}
}