How to create LINQ queries to filter the elements of an array of objects

This complete sample shows how to create LINQ queries in a C# application to filter the elements of an array of objects.

Code:

using System;
using System.Linq;

namespace ConsoleApplications
{
    class ArrayLinqDemo
    {
        static void Main(string[] args)
        {
            // Create an array of type object Fruit
            Fruit[] fruits = new Fruit[7];

            fruits[0] = new Fruit("Ananas", 14, 10);
            fruits[1] = new Fruit("Apple", 8, 3);
            fruits[2] = new Fruit("Mango", 5, 16);
            fruits[3] = new Fruit("Orange", 23, 18);
            fruits[4] = new Fruit("Lemon", 9, 12);
            fruits[5] = new Fruit("Papaya", 11, 3);
            fruits[6] = new Fruit("Raspberry", 33, 23);

            Console.WriteLine("All elements of the array");
            foreach (Fruit f in fruits)
            {
                Console.WriteLine( f.ToString() );
            }

            // Select the fruit whose name starts with A
            Console.WriteLine();
            Console.WriteLine("Select the fruit whose name starts with A");
            var queryByName =
            from fruit in fruits
            where (fruit.Name.StartsWith("A"))
            orderby fruit.Name ascending
            select fruit;

            foreach (Fruit f in queryByName)
                Console.WriteLine("{0}", f.ToString());

            // Select the fruits whose amount is less than 10
            Console.WriteLine();
            Console.WriteLine("Select the fruits whose amount is less than 10");
            var queryByQuantity =
            from fruit in fruits
            where (fruit.Amount<10)
            orderby fruit.Amount ascending
            select fruit;

            foreach (Fruit f in queryByQuantity)
                Console.WriteLine("{0}", f.ToString());

            // Extract the fruit whose weight is greater than 10
            Console.WriteLine();
            Console.WriteLine("Extract the fruit whose weight is greater than 10");
            var queryByWeight =
            from fruit in fruits
            where (fruit.Weight > 10)
            orderby fruit.Weight ascending
            select fruit;

            foreach (Fruit f in queryByWeight)
                Console.WriteLine("{0}", f.ToString());
        }

    }

    /// <summary>
    /// A simple class to represent the fruits
    /// </summary>
    class Fruit
    {
        private string name;
        private int amount;
        private int weight;

        public string Name 
        { 
            get{ return name;}
            set { name = value; }
        }

        public int Amount
        {
            get { return amount; }
            set { amount = value; }
        }

        public int Weight
        {
            get { return weight; }
            set { weight = value; }
        }

        public Fruit(string n, int a, int w)
        {
            name = n;
            amount = a;
            weight = w;
        }

        public new string ToString()
        {
            return String.Format("{0} ({1}), [{2}]",name, amount, weight);
        }
    }
}

Result:

All elements of the array
Ananas (14), [10]
Apple (8), [3]
Mango (5), [16]
Orange (23), [18]
Lemon (9), [12]
Papaya (11), [3]
Raspberry (33), [23]

Select the fruit whose name starts with A
Ananas (14), [10]
Apple (8), [3]

Select the fruits whose amount is less than 10
Mango (5), [16]
Apple (8), [3]
Lemon (9), [12]

Extract the fruit whose weight is greater than 10
Lemon (9), [12]
Mango (5), [16]
Orange (23), [18]
Raspberry (33), [23]