示例如图：
//设置treeviw默认为第一个菜单打开
if (ASPxTreeView1.SelectedNode == null)
ASPxTreeView1.SelectedNode = ASPxTreeView1.Nodes[0];
前端控件代码：
<dx:ASPxTreeView ID="ASPxTreeView1" ClientInstanceName="ASPxTreeView1" runat="server" Width="100%" AllowSelectNode="True" AutoPostBack="false" Styles-NodeText-Font-Size="10px">
<ClientSideEvents Init="TreeNodeClick" NodeClick="TreeNodeClick" />
</dx:ASPxTreeView>
后天代码：
//数据绑定（重点）
#region 建立树状菜单
// 创建主菜单
private void CreateMenu()
{
//MainFrameState mainFrameState = new MainFrameState();
//d_loginUserId = mainFrameState.LoginUserID;
DataTable dt = new DataTable();
dt = platbll.GetB1tree().Tables[0];
if (dt.Rows.Count > 0)
{
DataRow[] mainRow = (DataRow[])dt.Select();
foreach (DataRow row in mainRow)
{
_treenode = new TreeViewNode();
_treenode.Text = row["PEONAME"].ToString();
_treenode.ToolTip = row["treepeoid"].ToString();// 储存一个id
ASPxTreeView1.Nodes.Add(_treenode);
if (row["treepeoid"].ToString()!=null)
{
CreateChildMenu(int.Parse(row["treepeoid"].ToString()), _treenode);
}
}
}
}
// B1级菜单
private void CreateChildMenu(int d_parentID, TreeViewNode TVN)
{
DataTable dt = new DataTable();
dt = platbll.GetB2tree(d_parentID).Tables[0];
DataRow[] childRow = (DataRow[])dt.Select();
foreach (DataRow row in childRow)
{
_treenode = new TreeViewNode();
_treenode.Text = row["PEONAME"].ToString();
_treenode.ToolTip = row["treepeoid"].ToString();
TVN.Nodes.Add(_treenode);
// ASPxTreeView1.Nodes.Add(TVN);
if (row["treepeoid"].ToString() != null)
{
CreateChildMenu1(int.Parse(row["treepeoid"].ToString()), _treenode);
}
}
}
// B2、B3级菜单
private void CreateChildMenu1(int d_parentID, TreeViewNode TVN)
{
DataTable dt = new DataTable();
dt = platbll.GetB2tree(d_parentID).Tables[0];
DataRow[] childRow = (DataRow[])dt.Select();
foreach (DataRow row in childRow)
{
_treenode = new TreeViewNode();
_treenode.Text = row["PEONAME"].ToString();
_treenode.ToolTip = row["treepeoid"].ToString();
TVN.Nodes.Add(_treenode);
}
}
#endregion