树形数据绑定Dropdrownlist控件

[liucong303038910]

表结构就是 id category_name parent_id

public void AddTreeDropDrown(int ParentID, DropDownList pLsit)
    {
        DataTable dt = new CategoryBLL().GetAllCategory();
        DataView dvTree = new DataView(dt);
        ListItem li;
        //过滤ParentID,得到当前的所有子节点
         dvTree.RowFilter = "[PARENT_ID] = " + ParentID;

        foreach (DataRowView Row in dvTree)
        {
            if (pLsit == null)
            {    //添加根节点
                li = new ListItem("─»" + Row["Category_Name"].ToString(), Row["ID"].ToString());
                DropDownList1.Items.Add(li);
                AddTreeDropDrown(Int32.Parse(Row["ID"].ToString()), DropDownList1);    //再次递归
            }
            else
            {   //̀添加当前节点的子节点
                li = new ListItem("└─»" + Row["Category_Name"].ToString(), Row["ID"].ToString());
                DropDownList1.Items.Add(li);
                AddTreeDropDrown(Int32.Parse(Row["ID"].ToString()), DropDownList1);     //再次递归
            }
        }

这是一个树形的结构表遍历绑定到Dropdownlist控件上
现在都能遍历出来，我想遍历出来的同时，在前面加个区分级别的字符└─»，级别越深这个字符越长，现在只能区分两种类别
请高手帮忙指点下 谢谢了！

[liucong303038910]

顶

[liucong303038910]

顶

[blackmeit]

└ ─ » 用viewstate保存 “-”，每次递归加上一个“-”，符号用"└"+viewstate+"»"表示。

[liucong303038910]

就是不知道再哪儿判断

[CutBug]

有段代码，供参考

/// <summary>
    /// 绑定分类下拉列表
    /// </summary>
    private void BindDropDownList()
    {
        this.TParentCate.Items.Clear();
        this.TParentCate.Items.Add(new ListItem("◇根目录", "0"));
        BindDropListByList(UCTreeKMCate1.ThisDataSource);
        
    }


    /// <summary>
    /// List里过滤根基点
    /// </summary>
    /// <param name="m"></param>
    /// <returns></returns>
    private bool FindMatch(KnowlegeCate m)
    {
        if (m.ParentID == 0)
        {
            return true;
        }
        return false;
    }



    /// <summary>
    /// 按层次绑定下拉框
    /// </summary>
    /// <param name="mList"></param>
    /// <param name="mPCateID"></param>
    private void BindDropListByList(List<KnowlegeCate> mList)
    {
        string chrFlag = "┆┄◇";
        List<KnowlegeCate> list = mList.FindAll(FindMatch);
        foreach (KnowlegeCate m in list)
        {
            this.TParentCate.Items.Add(new ListItem(chrFlag + m.CateName, m.CateID.ToString()));
            RecursionBind(mList, m.CateID, ref chrFlag);
        }
    }

    private void RecursionBind(List<KnowlegeCate> mList,int mCateID,ref string chr)
    {
        foreach (KnowlegeCate m in mList)
        {
            if (m.ParentID == mCateID)
            {
                chr = "┆┄" + chr;
                this.TParentCate.Items.Add(new ListItem(chr + m.CateName, m.CateID.ToString()));
                RecursionBind(mList, m.CateID, ref chr);
            }
            
        }
        chr = "┆┄◇";

    }