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;
}