A recursive processing JSON tree node help class __js

Using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.Hosting;
using System.Security.Permissions;
using System.Text;
using Clientcontrol;

<summary>
Summary description of Exttree
</summary>
public class Exttree
{
private string _xmlpath;
private static Exttree exttree = null;
public static Exttree Current
{
Get
{
if (Exttree = null)
Exttree = new Exttree ();

return exttree;
}
}

DataTable Dttree = new DataTable ();

private string Logidid = String. Empty;
private string SessionID = String. Empty;

Private Exttree ()
{
Initxmlpath ();
Getallnodes ();
}

private void Initxmlpath ()
{
String Xmlpath = "~/app_data/tree.xml";
_xmlpath = Hostingenvironment.mappath (Xmlpath);
FileIOPermission Permission = new FileIOPermission (Fileiopermissionaccess.write, _xmlpath);
Permission. Demand ();
}

Private DataTable Getallnodes ()
{
Ds. READXML (_xmlpath);
Dttree = Mainclientcontrol.instance (). Gettree (This.logidid, This.sessionid);
return dttree;
}

Private DataTable Getallnodes (String parentid)
{
DataTable dt = Getallnodes ();
DataTable dt = Dttree;
DataTable _dt = dt. Clone ();

datarow[] DRS = dt. Select ("ParentID = '" + parentid.) ToString () + "'");
if (DRS). Length > 0)
//{
foreach (DataRow Dr in Drs)
//    {
_dt. ImportRow (DR);
//    }
//}
foreach (DataRow dr in Dt. Rows)
{
if (dr["ParentID"]. ToString () = = ParentID. ToString ())
_dt. Rows.Add (Dr. ItemArray);
}
return _DT;
}

public string Createexttreejson (String logidid,string SessionID)
{
This.logidid = Logidid;
This.sessionid = SessionID;
Getallnodes ();
StringBuilder sb = new StringBuilder ();
Createexttreenode (SB);
String s= sb. ToString ();
Return S.replace ("{", "},{");
}
/*
* EXT Tree JSON Data part Properties Description:
* Text: The node file to display
* ID: This doesn't have to be explained.
* HREF: Link address
* Hreftarget: Link Target frame name
* Children: Sub-node format: [{Node 1},{Node 2} ...]
* Leaf: Whether the current node is a leaf node. If False, this node has child nodes.
* Otherwise true, this node is in a child-free node
* */
private void Createexttreenode (StringBuilder sb)
{
DataTable dt = Getallnodes ("0");
if (dt. Rows.Count > 0)
{
Sb. Append ("[");
foreach (DataRow dr in Dt. Rows)
{
Sb. Append ("{");
Sb. Append ("text:" + dr["title"]. ToString () + "',");
if (This.logidid = = "9999")
{
Sb. Append ("Checked:false,");
}
Sb. Append ("ID: ' node" + dr["id"]. ToString () + "',");
Sb. Append ("ID:" + dr["id"]. ToString () + "',");
Sb. Append ("href:" + dr["url"]. ToString () + "',");
Sb. Append ("Hreftarget: ' Main '");
Addchildrennode (Getallnodes (dr["id"). ToString ()), SB);
Sb. Append ("}");
}
}

Sb. Append ("]");
}

private void Addchildrennode (DataTable dt,stringbuilder SB)
{
if (dt. Rows.Count > 0)
{
Sb. Append (", leaf:false,children:[");
foreach (DataRow dr in Dt. Rows)
{
Sb. Append ("{");
Sb. Append ("text:" + dr["title"]. ToString () + "',");
if (This.logidid = = "9999")
{
Sb. Append ("Checked:false,");
}
Sb. Append ("ID: ' node" + dr["id"]. ToString () + "',");
Sb. Append ("ID:" + dr["id"]. ToString () + "',");
Sb. Append ("href:" + dr["url"]. ToString () + "',");
Sb. Append ("Hreftarget: ' Main '");
Addchildrennode (Getallnodes (dr["id"). ToString ()), SB);
Sb. Append ("}");
}

Sb. Append ("]");
}
Else
Sb. Append (", leaf:true");
}
}