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[转载]C#不用treeview控件生成漂亮的树型结构

yoours2014-04-23 12:44:23 阅读 1495

简介一边听听音乐，一边写写文章。

 C# Code 

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/// 通用的树型类，可以生成任何树型结构
public class CateTreeView
{
    IList lsCate = new List();//初始化数组
    string[] icons = new string[] { "│", "├", "└" };//修饰符号
    string htmlret = "";
    string nbsp = " ";
    public CateTreeView(IList ls)
    {
        lsCate = ls;
        htmlret = "";
    }
    public CategoryInfo getOne(int id)
    {
        foreach (CategoryInfo m in lsCate)
        {
            if (m.cateid == id)
            {
                return m;
            }
        }
        return null;
    }

    /// 得到父级数组
    public IList get_parent(int myid)
    {
        IList lsnew = new List();
        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;

    }

    /// 得到子级分类
    public IList get_child(int myid)
    {
        IList lsnew = new List();

        foreach (CategoryInfo mcate in lsCate)
        {
            if (mcate.parentid == myid)
            {
                lsnew.Add(mcate);
            }
        }
        return lsnew;
    }

    /// 得到树型结构
    public string get_tree(int myid, string str, int sid, string adds, string str_group)
    {
        int number = 1;
        IList 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;
    }

    /// 同上一类方法，jquery treeview 风格，可伸缩样式（需要treeview插件支持）
    public string get_treeview(int myid, string effected_id, string str, string str2, int showlevel, string style, int currentlevel, bool recursion)
    {
        IList child = get_child(myid);

        string effected = "id=\"" + effected_id + "\"";
        string placeholder = "";
        if (!recursion) htmlret += "" + style + "\">";
        foreach (CategoryInfo m in child)
        {
            IList child2 = get_child(m.cateid);
            string folder = "";
            //@extract($a);
            if (showlevel > 0 && showlevel == currentlevel && (child2.Count > 0)) folder = "hasChildren";//如设置显示层级模式@2011.07.01
            string floder_status = ((folder != "") ? " class=\"" + folder + "\"" : "");
            htmlret += recursion ? "" + m.cateid + "\">" : "+ m.cateid + "\">";
            recursion = false;
            if (child2.Count > 0)
            {
                string nstr = str2;
                //eval("\$nstr = \"$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 ? " " : "";
        }
        if (!recursion)htmlret += "";
        return htmlret;
    }
}

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