C# Code

[Vladimir Vancea]

What is wrong with my code at line 106 ?

using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ExamenComposite { class Program { static void Main(string[] args) { MenuRepository mr = new MenuRepository(); mr.getMenu(); CreateTree TR = new CreateTree(); TR.createMyTree(mr.list); TR.root.Display(TR.root); Console.ReadKey(); } } class ItemMenuDB { public int id; public string Name; public int parent; public ItemMenuDB(int id, string Name, int parent) { this.id = id; this.Name = Name; this.parent = parent; } } class MenuRepository { public ArrayList list = new ArrayList(); public void getMenu() { list.Add(new ItemMenuDB(1, "Pizza", 0)); list.Add(new ItemMenuDB(2, "Pizza_Europa", 1)); list.Add(new ItemMenuDB(3, "Pizza_Asia", 1)); list.Add(new ItemMenuDB(4, "Pizza_America", 1)); list.Add(new ItemMenuDB(5, "Pizza_America_NY", 4)); list.Add(new ItemMenuDB(6, "Pizza_Europe_MD", 2)); list.Add(new ItemMenuDB(7, "Juice", 0)); list.Add(new ItemMenuDB(8, "Juice_Apple", 7)); list.Add(new ItemMenuDB(9, "Juice_Orange", 7)); } } abstract class Component { public ItemMenuDB itemmenudb; public Composite parent; public ArrayList List; public int level; public Component(ItemMenuDB itemmenudb, Composite parent, int level) { this.itemmenudb = itemmenudb; this.parent = parent; this.level = level; List = new ArrayList(); } public abstract void Add(Component component); public abstract void Remove(Component component); public abstract void Display(Component component); } class Composite : Component { public Composite(ItemMenuDB itemmenudb, Composite parent, int level) : base(itemmenudb, parent, level) { } public override void Add(Component component) { List.Add(component); } public override void Remove(Component component) { List.Remove(component); } public override void Display(Component component) { string tt = ""; for(int i = 0; i < component.level; i++) tt += "_"; Console.WriteLine("{0}This is {1} level Item from Menu,Item name is:{3}", tt, component.level, component.itemmenudb.Name); foreach(Object o in component.List) { Composite t = (Composite)o; Display(t); } } } class CreateTree { public Composite root; public CreateTree() { root = new Composite(null, null, 0); } public void createMyTree(ArrayList list) { ItemMenuDB temp; for (int i = 0; i < list.Count; i++) { temp = (ItemMenuDB)list[i]; if (temp.parent == 0) { Composite New_C = new Composite(temp, root, root.level+1); root.Add(New_C); recursion(list, New_C); } } } void recursion(ArrayList list, Composite New_C) { ItemMenuDB temp; for (int i = 0; i < list.Count; i++) { temp = (ItemMenuDB)list[i]; if (New_C.itemmenudb.id == temp.parent) { Composite NCC = new Composite(temp, New_C, New_C.level+1); New_C.Add(NCC); recursion(list, NCC); } } } } }

[Paul Clapham]

I'd say that you have {0} and {1} and {3} as place-holders in the format string, but you don't have {2}. I assume you got a run-time error message -- didn't it say anything like that?