TreeView(C#)无限目录树代码片段

#region 绑定客户树
protected void bindTreeView()
{
TreeView1.Nodes.Clear();
string userid = Session["UserID"].ToString();
string sqlwr = new SY_ADMINUSER().GetUserIDListByLoginUser(userid, "CUSTOMERSERVICE", false);
DataTable dt = Maticsoft.DBUtility.DbHelperOra.Query("Select PARENTID,CUSTOMERID,CUSTOMERSHORT,CUSTOMERSERVICE from CU_CUSTOMER where ISDELETE='0' " + sqlwr + " order by CUSTOMERSHORT ").Tables[0];
//定义临时树节点
TreeNode tmpNd;

//特殊处理
foreach (DataRow dr in dt.Rows)
{
DataRow[] drs = dt.Select("CUSTOMERID='" + dr["PARENTID"] + "'");
if (drs.Length == 0) //无上级节点
{
dr["PARENTID"] = "0";
}
}
dt.AcceptChanges();

//从DataTable中得到所有父节点为null的DataRow形成的数组
DataRow[] rows = dt.Select("PARENTID='0'");
//遍历根节点数组
foreach (DataRow row in rows)
{
tmpNd = new TreeNode();
//给根节点赋值
tmpNd.Value = row["CUSTOMERID"].ToString();
tmpNd.Text = row["CUSTOMERSHORT"].ToString();
tmpNd.Expanded = true;
//将节点加入到树中
TreeView1.Nodes.Add(tmpNd);
AddTree(dt, TreeView1, tmpNd, row["CUSTOMERID"].ToString());
}
}

public void AddTree(DataTable dt, TreeView tv, TreeNode pNode, string CUSTOMERID)
{
DataRow[] rows = dt.Select("PARENTID='" + CUSTOMERID + "'");
TreeNode tmpNd;
foreach (DataRow row in rows)
{
tmpNd = new TreeNode();
//给根节点赋值
tmpNd.Value = row["CUSTOMERID"].ToString();
tmpNd.Text = row["CUSTOMERSHORT"].ToString();
tmpNd.Expanded = true;
pNode.ChildNodes.Add(tmpNd);
//将节点加入到树中
//TreeView1.Nodes.Add(pNode);
AddTree(dt, TreeView1, tmpNd, row["CUSTOMERID"].ToString());
}
}
#endregion