Coolite comboBox控件动态显示树形结构(无限树)

效果图：

前台部份：

<ext:Store ID="Store1" runat="server" AutoLoad="false" >
        <Reader>
            <ext:JsonReader ReaderID="id">
                <Fields>
                    <ext:RecordField Name="id" Type="String" Mapping="id" />
                    <ext:RecordField Name="name" Type="String" Mapping="name" />
                </Fields>
            </ext:JsonReader>
        </Reader>

 </ext:Store>

<ext:ComboBox ID="cboSortCoding" runat="server" Enabled="true" FieldLabel="知识类别" EmptyText="请选择知识类别" 
   AllowBlank="false" BlankText="请选择知识类别!" Width="260" DisplayField="name"  ValueField="id"   
   StoreID="Store1" Editable="false" /> 

后台部分：

    System.Data.DataView dv;
    List<object> data = new List<object>();
    int NodeLevelNum = 0;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            clsDA_kno_KnowledgeSort myKnoSort = new clsDA_kno_KnowledgeSort();//读数据库
            dv =myKnoSort.m_Select().DefaultView;//得到DataTable
            m_InitKnoSort(0);

            this.Store1.DataSource = data;
            this.Store1.DataBind();

         }
    }

    //初始化下拉菜单
    private void m_InitKnoSort(int intParentNote)
    {
        dv.RowFilter = String.Format("ParentNode={0}", intParentNote);
        foreach (DataRowView drv in dv)
        {
            if (intParentNote != 0)//第一个节点不加

            {
                string strNodeName = drv["NodeName"].ToString();

                strNodeName = m_NodeLevel(intParentNote) + strNodeName;

                data.Add(new { id = drv["Node"].ToString(), name = strNodeName });
            }
            m_InitKnoSort((int)drv["Node"]);
        }
    }

    //通过节点级数合成为 2级则为"--"
    private string m_NodeLevel(int intParentNote)
    {
        string str = "";
        NodeLevelNum = 0;
        m_NodeLevelNum(intParentNote);
        for (int i =2; i < NodeLevelNum; i++)
        {
            str = str + "—";
        }
        return str;
    }

    //获取节点级数
    private void m_NodeLevelNum(int intParentNote)
    {
        NodeLevelNum = NodeLevelNum + 1;
        System.Data.DataView dv1 = new System.Data.DataView();
        dv1=dv;
        dv1.RowFilter = String.Format("Node={0}", intParentNote);
        foreach (DataRowView drv in dv)
        {
            m_NodeLevelNum((int)drv["ParentNode"]);
        }
    }

数据库部分：

select * from kno_KnowledgeSort ORDER BY NodeOrder asc