C#实现的无限级分类类树形管理

protected void GetTypelist()
     {
         //分类id=0表示根分类，最上级分类
         GetTypeByparent("0",0);
     }
     protected void GetTypeByparent(string parenttypeid,int depth)
     {
         string padsapce = "  ";
         bool ishavesub = false;
         DataSet ds = new DataSet();
         Gametita.BLL.ArticleType bll = new Gametita.BLL.ArticleType();
         ds = bll.GetList(1000, "parenttypeid='" + parenttypeid + "'", " Typeid desc");
         if (ds != null)
         {
             if (ds.Tables.Count > 0)
             {
                 DataTable dt = ds.Tables[0];
                 for (int i = 0; i < dt.Rows.Count; i++)
                 {
                     string text = new string('*',depth*8);
                     TypeList += text + dt.Rows[i]["typename"].ToString() + "****<a href='articletype.aspx?parenttypeid=" + dt.Rows[i]["TypeID"].ToString() + "'>添加子分类</a>";
                     ishavesub = GetChildType(dt.Rows[i]["typeid"].ToString());
                     if (ishavesub)
                     {
                         TypeList += "<br>";
                     }
                     else
                     {
                         //没有子分类则可以删除
                         TypeList += "****<a href='articletypedel.aspx?typeid=" + dt.Rows[i]["TypeID"].ToString() + "' οnclick='javascript:confirm(真要删除该分类)'>删除分类</a><br>";
                     }
                     TypeList = TypeList.Replace("*", " ");
                     GetTypeByparent(dt.Rows[i]["typeid"].ToString(), depth + 1);
                 }
                 dt.Dispose();
                 dt = null;
             }
         }
         ds = null;
     }
     /// <summary>
     /// 检查是否有子分类
     /// </summary>
     /// <param name="parenttypeid"></param>
     /// <returns></returns>
     protected bool GetChildType(string parenttypeid)
     {
         bool ishave = false;
         DataSet ds = new DataSet();
         Gametita.BLL.ArticleType bll = new Gametita.BLL.ArticleType();
         ds = bll.GetList(1, "parenttypeid='" + parenttypeid + "'", " Typeid desc");
         if (ds != null)
         {
             if (ds.Tables.Count > 0)
             {
                 DataTable dt = ds.Tables[0];
                 if (dt.Rows.Count > 0)
                 {
                     ishave = true;
                 }
                 dt.Dispose();
                 dt = null;
             }
         }
         return ishave;    }
 
上面是列表树形分类的代码，前台输出Typelist即可，添加，删除的方法就很简单了。。。