DevExpress.XtraTreeList.TreeList控件：绑定数据源的例子

        private void DataShowTree()
        {
            this.Cursor = Cursors.WaitCursor;
            DataTable dt = null;
            string sSql = "	SELECT CONVERT(VARCHAR,ParentID) AS ParentID,convert(varchar,AddressBookID) as KeyID,TypeName as Name FROM tblAddressBookFolder A order by ParentID,Name";
            try
            {
                dt = sqlHelper.ExecuteDataTable(Common.ConnString, CommandType.Text, sSql);
                if (dt == null || dt.Rows.Count == 0)
                {
                    string sSql1 = " INSERT INTO [tblAddressBookFolder]([AddressBookID],[ParentID],[TypeName])  select 1,0,'Data'";
                    int iResult = sqlHelper.ExecuteNonQuery(Common.ConnString, CommandType.Text, sSql1);
                    dt = sqlHelper.ExecuteDataTable(Common.ConnString, CommandType.Text, sSql);
                }
            }
            catch (Exception ex)
            {
                Common.DisplayMsg(this.Text, ex.Message.ToString());
            }

            trl.Nodes.Clear();
            trl.DataSource = dt;
            trl.ParentFieldName = "ParentID";
            trl.KeyFieldName = "KeyID";
            trl.Columns["Name"].Caption = "通讯录";

           // //调用刚才递归并传参，保证所有节点被遍历
            //if (!string.IsNullOrEmpty(sFocusedNodeText))
           // {
           //     foreach (TreeListNode node in this.trl.Nodes)
           //     {
           //         FindSelectedNode(node);
           //     }
           // }

            this.trl.Nodes[0].Expanded = true; // 只显示1级目录

            //sSql = "select AddressBookID,TypeName FROM tblAddressBookFolder WHERE AddressBookID>1";
           // Common.SetLookUpList(ref loeType, sSql, 0, 1);// 所属关系类别  重新刷一下

            this.Cursor = Cursors.Default;
        }

说明：

1， trl 就是 DevExpress.XtraTreeList.TreeList的 ID

2， 关于 sqlHelper 类，有很多。这里不说了。

3， 数据库表的结构为 tblTest(ParentID int,ID int,Name varchar(20)) 这种格式，3个字段就行了。