【标题】：绑定列表框树型控件
【关键字】：
【来源】：http://blog.csdn.net/pxxx123/archive/2007/04/12/1562533.aspx

绑定列表框树型控件

这个我以前在cnblogs上发过，记得那是04年刚刚工作的事。
(后来退出博客园了，博客清空了，损失很多技术收藏，原创的东东)

还经常看到有些老手不知道怎么实现，寒一个

呵呵，本人算法厉害，show一哈

public class WebTree {

    DataTable sourceData;
    StringBuilder b;
    string preIdField;
    string curIdField;
    string curNameField;

    public WebTree(DataTable t, string _curid, string _preid, string _curname) {
        sourceData = t.Copy();
        preIdField = _preid;
        curIdField = _curid;
        curNameField = _curname;
        b = new StringBuilder();
    }

    public void BindDrp(ListItemCollection items, string preId, DataTable dt) {
        if (dt.Rows.Count == 0)
            return;
        //给出两种算法。
        /*for (int i = 0; i < dt.Rows.Count; i++) {
            DataRow dr = dt.Rows[i];
            if (dr[preIdField].ToString() == preId) {

                int depth = GetDepth(dr[preIdField].ToString());
                string deep = "";
                if (depth == 0)
                    deep = "◆ ";
                else {
                    deep += "├"; //├─┣━
                    for (int j = 0; j < depth - 1; j++) {
                        deep += "─";
                    }
                    deep += " ";
                }
                items.Add(new ListItem(HttpUtility.HtmlDecode(deep + dr[curNameField].ToString()), dr[curIdField].ToString()));
                string bId = dr[curIdField].ToString();
                dt.Rows.Remove(dt.Rows[i]);
                BindDrp(items, bId, dt);
                BindDrp(items, preId, dt);
            }
        }*/
        DataRow[] rs = dt.Select(preIdField + "=" + preId, "OrderNum asc");
        if (rs.Length == 0) return;
        DataRow dr = rs[0];
        int depth = GetDepth(dr[preIdField].ToString());
        string deep = "";
        if (depth == 0)
            deep = "◆ ";
        else {
            deep += "├"; //├─┣━
            for (int j = 0; j < depth - 1; j++) {
                deep += "─";
            }
            deep += " ";
        }
        items.Add(new ListItem(HttpUtility.HtmlDecode(deep + dr[curNameField].ToString()), dr[curIdField].ToString()));
        string bId = dr[curIdField].ToString();
        dt.Rows.Remove(dr);
        BindDrp(items, bId, dt);
        BindDrp(items, preId, dt);
    }

    public int GetDepth(string id) {
        DataRow[] rows = sourceData.Select(curIdField + "=" + id);
        if (rows.Length == 0)
            return 0;
        return GetDepth(rows[0][preIdField].ToString()) + 1;
    }

}

使用示例：

DataTable data = new Boards().GetList("");
WebTree boardTree = new WebTree(data,T_Board.BoardId,T_Board.PreId,T_Board.BoardName);
boardTree.BindDrp(drpPre.Items, "0", data);
drpPre.Items.Insert(0, new ListItem("", "0"));

DataTable data = new UpFiles().GetCates("");
WebTree cateTree = new WebTree(data, T_FileCategory.FileCateId, T_FileCategory.PreId, T_FileCategory.CateName);
cateTree.BindDrp(drpPre.Items, "0", data);

效果图：

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