C#不用treeview控制項產生漂亮的樹型結構

項目要求採用自己的模板驅動和UI結構致使不能使用任何ASP.NET內建控制項。
今天要給無限分類產生樹形結構，我參考了網上的一個演算法 據說是PHPCMS用的產生樹類。的確很帥，沒有太多時間直接照搬改成C#版。

/// <summary>    /// 通用的樹型類，可以產生任何樹型結構     /// </summary>    public class CateTreeView    {        IList<CategoryInfo> lsCate = new List<CategoryInfo>();  //初始化數組         string[] icons = new string[] { "│", "├", "└" };   //修飾符號         string htmlret = "";        string nbsp = " ";        public CateTreeView(IList<CategoryInfo> ls)        {            lsCate = ls;            htmlret = "";        }        public CategoryInfo getOne(int id)        {            foreach (CategoryInfo m in lsCate)            {                if (m.cateid == id)                {                    return m;                }            }            return null;        }        /// <summary>        /// 得到父級數組        /// </summary>        /// <param name="myid"></param>        /// <returns></returns>        public IList<CategoryInfo> get_parent(int myid)        {            IList<CategoryInfo> lsnew = new List<CategoryInfo>();            CategoryInfo m = getOne(myid);            if (m == null) return lsnew;            int pid = m.parentid;            if (pid == 0) return lsnew;            pid = getOne(pid).parentid;            foreach (CategoryInfo mcate in lsCate)            {                if (mcate.parentid == pid)                {                    lsnew.Add(mcate);                }            }            return lsnew;        }        /// <summary>        /// 得到子級分類        /// </summary>        /// <param name="myid"></param>        /// <returns></returns>        public IList<CategoryInfo> get_child(int myid)        {            IList<CategoryInfo> lsnew = new List<CategoryInfo>();            foreach (CategoryInfo mcate in lsCate)            {                if (mcate.parentid == myid)                {                    lsnew.Add(mcate);                }            }            return lsnew;        }         /// <summary>        /// 得到樹型結構        /// </summary>        /// <param name="myid">表示獲得這個ID下的所有子級</param>        /// <param name="str">產生樹型結構的基本代碼，例如： option value=$id $selected $spacer$name option </param>        /// <param name="sid">被選中的ID，比如在做樹型下拉框的時候需要用到</param>        /// <param name="adds"></param>        /// <param name="str_group"></param>        /// <returns></returns>        public string get_tree(int myid, string str, int sid, string adds, string str_group)        {            int number = 1;            IList<CategoryInfo> child = get_child(myid);            if (child.Count > 0)            {                int total = child.Count;                foreach (CategoryInfo m in child)                {                    string j = "", k = "";                    if (number == total)                    {                        j += icons[2];                    }                    else                    {                        j += icons[1];                        k = adds != "" ? icons[0] : "";                    }                    string spacer = adds != "" ? adds + j : "";                    string selected = m.cateid == sid ? "selected" : "";                    string tempstr = "";                    if (m.parentid == 0 && str_group != "") //? "\$nstr = \"$str_group\";" : "\$nstr = \"$str\";";                    {                        tempstr = str_group;                    }                    else                    {                        tempstr = str;                    }                    tempstr = tempstr.Replace("$id", m.cateid.ToString());                    tempstr = tempstr.Replace("$parentid", m.parentid.ToString());                    tempstr = tempstr.Replace("$select", selected);                    tempstr = tempstr.Replace("$spacer", spacer);                    tempstr = tempstr.Replace("$name", m.catename);                    tempstr = tempstr.Replace("$modelid", m.modelid.ToString());                    htmlret += tempstr;                    string bspstr = nbsp;                    get_tree(m.cateid, str, sid, adds + k + bspstr, str_group);                    number++;                    //$this->ret .= $nstr;                    //$nbsp = $this->nbsp;                    //$this->get_tree($id, $str, $sid, $adds.$k.$nbsp,$str_group);                    //$number++;                }            }            return htmlret;            //return $this->ret;        }        /// <summary>        /// 同上一類方法，jquery treeview 風格，可伸縮樣式（需要treeview外掛程式支援）        /// </summary>        /// <param name="myid">表示獲得這個ID下的所有子級</param>        /// <param name="effected_id">需要產生treeview目錄數的id</param>        /// <param name="str">末級樣式</param>        /// <param name="str2">目錄層級樣式</param>        /// <param name="showlevel">直接顯示層級數，其餘為非同步顯示，0為全部限制</param>        /// <param name="style">目錄樣式 預設 filetree 可增加其他樣式如'filetree treeview-famfamfam</param>        /// <param name="currentlevel">計算當前層級，遞迴使用 適用改函數時不需要用該參數</param>        /// <param name="recursion">遞迴使用 外部調用時為FALSE</param>        /// <returns>HTML</returns>        public string get_treeview(int myid, string effected_id, string str, string str2, int showlevel, string style, int currentlevel, bool recursion)        {            IList<CategoryInfo> child = get_child(myid);                       string effected = "id=\"" + effected_id + "\"";            string placeholder = "<ul><li><span class='placeholder'></span></li></ul>";            if (!recursion) htmlret += "<ul " + effected + "  class=\"" + style + "\">";            foreach (CategoryInfo m in child)            {                IList<CategoryInfo> child2 = get_child(m.cateid);                string folder = "";                //@extract($a);                if (showlevel > 0 && showlevel == currentlevel && (child2.Count > 0)) folder = "hasChildren"; //如設定顯示層級模式@2011.07.01                string floder_status = ((folder != "") ? " class=\"" + folder + "\"" : "");                htmlret += recursion ? "<ul><li " + floder_status + " id=\"" + m.cateid + "\">" : "<li " + floder_status + " id=\"" + m.cateid + "\">";                recursion = false;                if (child2.Count > 0)                {                    string nstr = str2;                    //eval("\$nstr = \"$str2\";");                    string tempstr = str2;                    tempstr = tempstr.Replace("$id", m.cateid.ToString());                    tempstr = tempstr.Replace("$parentid", m.parentid.ToString());                    //tempstr = tempstr.Replace("$select", selected);                    //tempstr = tempstr.Replace("$spacer", spacer);                    tempstr = tempstr.Replace("$name", m.catename);                    tempstr = tempstr.Replace("$modelid", m.modelid.ToString());                    htmlret += tempstr;                    if (showlevel == 0 || (showlevel > 0 && showlevel > currentlevel))                    {                        get_treeview(m.cateid, effected_id, str, str2, showlevel, style, currentlevel + 1, true);                    }                    else if (showlevel > 0 && showlevel == currentlevel)                    {                        htmlret += placeholder;                    }                }                else                {                    string nstr = str;                    string tempstr = str;                    tempstr = tempstr.Replace("$id", m.cateid.ToString());                    tempstr = tempstr.Replace("$parentid", m.parentid.ToString());                    //tempstr = tempstr.Replace("$select", selected);                    //tempstr = tempstr.Replace("$spacer", spacer);                    tempstr = tempstr.Replace("$name", m.catename);                    tempstr = tempstr.Replace("$modelid", m.modelid.ToString());                    htmlret += tempstr;                               //str += nstr;                }                htmlret += recursion ? "</li></ul>" : "</li>";            }            if (!recursion)htmlret += "</ul>";            return htmlret;        }    }

 沒有太高的複用性，用到的人自行改進把呵呵。別忘了改後再分享下。 其中CategoryInfo類是 分類實體類。

 

結合jquery treeview 外掛程式 做出的效果圖如下：