c# - iterate through objects with Lists of the object -

i have small program should create simple menu. current problem have object should fill main menu point , under menu points. question is, ilist can have second or third ilist , have no idea how interate on n ilists

example:

mainnodeobj: nodedtoid = 1, itemcode = 'a' ilist<nodedto> childmenunodes {   mainnodeobj:   nodedtoid = 2,   itemcode = '2',   ilist<nodedto> childmenunodes   {      mainnodeobj:      nodedtoid = 3,      itemcode = '3',   } 

my problem each childnode can have new childnode , each child node create new object...sounds easy dont know how iterate on n new childnodes

methods:

private ienumerable<nodedto> sortednodes(int id)         {             var nodes = loadmenunodes(id);             foreach (menunode menunode in nodes                 .where(s => s.menuitemid == null && s.parentnodeid == null)                 .orderby(x => x?.sequence))             {                 nodedto tmpmenunode = new nodedto();                 tmpmenunode.menunodedtoid = menunode.id;                 tmpmenunode.menuitemcode = menunode.menuitem?.code;                 tmpmenunode.childmenunodes = loadchildnodes(menunode.childmenunodes).tolist();                 yield return tmpmenunode;             }         }   private ienumerable<nodedto> loadchildnodes(menunodelist menunode)         {             foreach (menunode childnode in menunode)             {                 nodedto tmchildnode = new nodedto();                 tmchildnode.menunodedtoid = childnode.id;                 tmchildnode.menuitemcode = childnode?.menuitem?.code;                 tmchildnode.childmenunodes = null;                 yield return tmchildnode;             }         }             public class nodedto     {         public int nodedtoid { get; set; }         public string itemcode { get; set; }         public ilist<nodedto> childmenunodes { get; set; }     } 

can't use resursive function

by placing in loadchildnodes function.

tmpchildnode.childmenunodes = loadchildnodes(childnode.childmenunodes).tolist();