本文实例讲述了asp.net实现递归方法取出菜单并显示在DropDownList中的方法。分享给大家供大家参考,具体如下:
树形栏目展示以DropDownList的形式显示出来。
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protected void Page_Load( object sender, EventArgs e) { if (!IsPostBack) { DataTable table = bllSite.GetChannelNames(CurrentUser.ParkID); BindChannelType(table, 0, 0); } } //递归方法取 private void BindChannelType(DataTable dt, int categoryid, int layer) { DataView dv = new DataView(dt); dv.RowFilter = " Pid= " + categoryid.ToString(); //过滤 if (categoryid != 0) { layer++; //默认为第一层 } foreach (DataRowView drv in dv) { string span = "" ; if (categoryid != 0) { for ( int i = 0; i < layer; i++) //父级菜单不缩进 { span += " " ; } span += "└" ; } ListItem li = new ListItem(); li.Text = span + drv[ "ChannelName" ].ToString(); li.Value = drv[ "Id" ].ToString(); this .ddlChannel.Items.Add(li); BindChannelType(dt, Convert.ToInt32(drv[ "Id" ]), layer); } } |
希望本文所述对大家asp.net程序设计有所帮助。