C # does not produce a beautiful tree structure without the TreeView control

The project requires its own template-driven and UI structure to make it impossible to use any asp.net-self controls.
Today to create a tree structure of infinite classification, I refer to an algorithm on the web is said to be phpcms used to generate tree classes. Really handsome, not too much time directly copied into the C # version.

<summary>///Generic tree class that can generate any tree structure///</summary> public class Catetreeview {ilist& Lt  categoryinfo> lscate = new list<categoryinfo> ();   Initialize array string[] icons = new string[] {"│", "├", "└"};
        Modifier symbol String htmlret = "";
        String nbsp = " ";
            Public Catetreeview (ilist<categoryinfo> ls) {lscate = ls;
        Htmlret = "";
                CategoryInfo getone (int id) {foreach (categoryinfo m in lscate) {
                if (M.cateid = = ID) {return m;
        } return null; ///<summary>///Get parent series///</summary>///<param name= "myID" ></p
        aram>///<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>///Get child classification///</summary>///<param name= "myID" ></pa 
            ram>///<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>///gets the tree structure///</summary>///<param name= "myID" > says get this  All children under ID </param>///<param name= "str" > Basic code for generating a tree structure, for example: Option value= $id $selected $spacer $name option </param>///<param name= "Sid" > selected IDs, such as the need to use </param>///<param name= when making a tree drop-down box 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 numb
            ER = 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>///The above methods, jquery TreeView style, Scalable style (requires TreeView plugin support)///</summary> <param name= "myID" > means to get all the children under this ID </param>///<param name= "effected_id" > need to generate the number of TreeView directories id</param>///<param name= "str" > End-level style </param>///<param name= "str2" > Directory-level sampleType </param>///<param name= "Showlevel" > Direct display level number, the rest is asynchronous display, 0 is full limit </param>///<param name= The ' style ' > TOC style default Filetree can add additional styles such as ' Filetree treeview-famfamfam</param>///<param name= ' CurrentLevel
        t; Compute the current level, recursive use of the modified function does not need to use this parameter </param>///<param name= "recursion" > recursion to use external call when false</param> <returns>HTML</returns> public string Get_treeview (int myID, string effected_id, String str, stri ng str2, int showlevel, string style, int currentlevel, bool recursion) {ilist<categoryinfo> ch
           
            ILD = 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";
                For example, set display level mode @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 = \" $str 2\ ";");
                    string tempstr = str2; TempStr = TempStr.
                    Replace ("$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; }

    }

Not too high reusability, the use of people to improve their own hehe. Don't forget to change it and share it. Where the CategoryInfo class is a taxonomy entity class.

The effect shown with the jquery TreeView plugin is as follows: