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C# List Examples


C# List Examples

1. Adding values
~~~ Program that adds elements to List (C#) ~~~

using System.Collections.Generic;

class Program
{
      static void Main()
      {
            List list = new List();
            list.Add(2);
            list.Add(3);
            list.Add(5);
            list.Add(7);
      }
}

***********************************************************************************

2. Adding objects.
Using Add method
~~~ Program that uses Add method (C#) ~~~

using System.Collections.Generic;

class Program
{
      static void Main()
      {
            // Add first four numbers to the List.
            List primes = new List();
            primes.Add(2);
            primes.Add(3);
            primes.Add(5);
            primes.Add(7);
      }
}

***********************************************************************************

3. Adding objects
-- Program that adds objects to List (C#) ---

using System.Collections.Generic;

class Program
{
      static void Main()
      {
            // Add three objects to a List.
            List list = new List();
            list.Add(new Test(1, 2));
            list.Add(new Test(3, 4));
            list.Add(new Test(5, 6));
      }
     
      class Test
      {
            int _a;
            int _b;
            public Test(int a, int b)
            {
                  _a = a;
                  _b = b;
            }
      };
}

***********************************************************************************

4. Loops
~~~ Program that loops through List (C#) ~~~

using System;
using System.Collections.Generic;

class Program
{
      static void Main()
      {
            List list = new List();
            list.Add(2);
            list.Add(3);
            list.Add(7);
     
            foreach (int prime in list) // Loop through List with foreach
            {
                  Console.WriteLine(prime);
            }
     
            for (int i = 0; i < null ="="=""> list = new List();
            list.Add(true);
            list.Add(false);
            list.Add(true);
            Console.WriteLine(list.Count); // 3
           
            list.Clear();
            Console.WriteLine(list.Count); // 0
      }
}

===Output of the program ===
3
0

***********************************************************************************

 5. Copying array to List
--- Program that copies array to List (C#) ---

using System;
using System.Collections.Generic;

class Program
{
      static void Main()
      {
            int[] arr = new int[3]; // New array with 3 elements
            arr[0] = 2;
            arr[1] = 3;
            arr[2] = 5;
            List list = new List(arr); // Copy to List
            Console.WriteLine(list.Count); // 3 elements in List
      }
}


=== Output of the program ===
(Indicates number of elements.)

3
***********************************************************************************
6. C# List Find Method
--- Program that uses Find method on List [C#] ---

using System;
using System.Collections.Generic;

class Program
{
      static void Main()
      {
            List list = new List(new int[] { 19, 23, 29 });
           
            // Finds first element greater than 20
            int result = list.Find(item => item > 20);
           
            Console.WriteLine(result);
      }
}

=== Output of the program ===
23


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