treeList1.DataSource = dt;
//只在初始化树的时候执行树节点展开的级别控制
m_IsInitialTreel = true;
treeList1.ExpandAll();
m_IsInitialTreel = false;
.....................
/// <summary>
/// TreeList1节点展开前的事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void treeList1_BeforeExpand(object sender, DevExpress.XtraTreeList.BeforeExpandEventArgs e)
{
//只展开第一层
if (m_IsInitialTreel == true && e.Node.Level > 0)
{
e.CanExpand = false;
}
}
