The ITC Prog Blog: Lazy advanced: Lazier!

Introduction

So we know a little bit about Lazy<T> now. Time to expand our knowledge a bit: let's write some code to pass a parameter to the constructor. It being the holiday season, lets involve the use of food!

Coding

Let's create a class called Food that passes a string parameter. This still uses the lazy concept to where the object doesn't exist until it really needs to. Onto some code:

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

namespace LazierTProject
{
  class Program
  {

    internal class FoodExtended
    {
      private string foodID;
      private string aboutFood;
      internal FoodExtended() { }
      internal FoodExtended(string foodID)
      {
        this.foodID = foodID;
      }

    }

    public class Food
    {
      public string id;
      private Lazy<FoodExtended> foodExtended;

      public Food(string id)
      {
        this.id = id;
        foodExtended = new Lazy<FoodExtended>(() => new FoodExtended(this.id));
      }
    }

    static void Main(string[] args)
    {
      Food turkeyForMe = new Food("Gobble gobble!");

      Lazy<Food> turkeyForYou = new Lazy<Food>(() => new Food("Turkey for you"));
      Console.WriteLine("Turkeys declared");

      Console.WriteLine();
      Console.WriteLine("turkeyForYou's food initialized:  {0}", turkeyForYou.IsValueCreated);
      Console.WriteLine();

      Console.WriteLine("turkeyForMe.Message: {0}", turkeyForMe.id);
      Console.WriteLine("turkeyForYou.Message: {0}", turkeyForYou.Value.id);
      Console.WriteLine();
      Console.WriteLine("turkeyForYou's food initialized:  {0}", turkeyForYou.IsValueCreated);

      Console.WriteLine("\nPress Any Key to Exit.");
      Console.ReadKey();

    }
  }
}