父子ID表的TREEVIW（转贴）

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表：

　perid 父ID, id　主键(子ID)

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protected void Page_Load(object sender, EventArgs e)
{

        using (SqlConnection Conn = new SqlConnection(logicClass.strConn()))
        {
            Conn.Open();
            string strsql = "select preid,id,name,keynum,ctime,orderid from doctree ";
            SqlDataAdapter sa = new SqlDataAdapter(strsql, Conn);
            DataSet ds = new DataSet();
            sa.Fill(ds);
            this.ViewState["ds"] = ds;
            Conn.Dispose();
            Conn.Close();
        }// end using

    }

//递归添加树的节点
    public void AddTree(int ParentID, TreeNode pNode)
    {
        DataSet ds = (DataSet)this.ViewState["ds"];
        DataView dvTree = new DataView(ds.Tables[0]);
        //过滤ParentID,得到当前的所有子节点
        dvTree.RowFilter = "[preid] = " + ParentID;
        dvTree.Sort = "orderid";

        foreach (DataRowView Row in dvTree)
        {
            TreeNode Node = new TreeNode();
            if (pNode == null)
            { //添加根节点
                Node.Text = Row["name"].ToString();
                TreeView1.Nodes.Add(Node);
                Node.Expanded = true;
                AddTree(Int32.Parse(Row["ID"].ToString()), Node); //再次递归
            }
            else
            { //添加当前节点的子节点
                Node.Text = Row["name"].ToString();
              // pNode.Nodes.Add(Node);
                pNode.ChildNodes.Add(Node);
                Node.Expanded = true;
                AddTree(Int32.Parse(Row["ID"].ToString()), Node); //再次递归
            }
        }
    }