gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace API1
{
    class Program
    {
        static List<int?> history;
        static String sw = null;
        static int index = 0;
        
        static String getS(String entityName)
        {

            List<int> lst;//back the Entity Id
            List<int?> lst1; //back refEntityRefId
            List<String> lst2 = null;//back the ifcRecord
            List<String> lst4 = null;
            List<String> lst3;
            int EntID;
            string[] arr = new string[] {};
            Entities2 e = new Entities2();


            lst = (from temp in e.Ifc_Entity
                   where temp.entityName == entityName
                   select temp.entityId).ToList();

            EntID = lst.ElementAt(0);
            Console.WriteLine("EntID" + EntID);

            lst1 = (from temp in e.Ifc_References
                    where temp.refEntityId == EntID
                    select temp.refEntityRefId).ToList();
            Console.WriteLine("lst1.Count" + lst1.Count);
            lst.Add(EntID);
           // history.Concat(lst1);
            //history.Union(lst1);)
            if (lst1.Count == 0)
            {
                int? Idd = history.ElementAt(index);
                String EntName = (from temp1 in e.Ifc_Entity
                                  where temp1.entityId == Idd
                                  select temp1.entityName).ToString();
                return getS(EntName);
                history.Clear();
            }
           // arr = new string[lst1.Count];
            String j;
            for (int i = 0; i < lst1.Count; i++)
            {
                int? temp = lst1.ElementAt(i);
                //Predicate<string> x = temp.ToString;                               
                lst2 = (from temp1 in e.Ifc
                        where temp1.ifcEntityRefId == temp
                        select temp1.ifcRecord).ToList();
             //   Console.WriteLine(temp);
                //Console.WriteLine(lst2.Last());               
               //lst2.Concat(lst2);
            }
            //Console.WriteLine("lst2.Count"+lst2.Count);
            for (int i = 0; i < lst1.Count; i++)
            {
                sw = sw + "#( " + lst1.ElementAt(i)+ " )" + "\n";
            }

            // history.Union(lst2);

            //int? Id = lst1.ElementAt(index);
            //lst3 = (from temp1 in e.Ifc_Entity
            //        where temp1.entityId == Id
            //        select temp1.entityName).ToList();
            //Console.WriteLine("lst3.Count" + lst3.Count);
            //Console.WriteLine("index  " + index);
            //index = index + 1;
            //if (lst1.Count <= index)
            //{
            //    return getS(lst3.ElementAt(index));
            //}
            //else
            //{                
            //    return sw;
            //}         
            //return getS(lst3.ElementAt(0));
            return sw;
        }

        static String getObject(int offset)
        {
            String s = getS("IFCAPPROVALPROPERTYRELATIONSHIP");
            char[] arr = sw.ToCharArray();
            return new String(arr, offset, 3);
        }
        static void Main(string[] args)
        {
            getObject(0);
            Console.WriteLine(sw);
            //             Console.WriteLine(getObject(0));
            Console.ReadLine();
        }
    }
}