Generic List<T> collection demonstration. - CSharp Collection

CSharp examples for Collection:List

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Description

Generic List<T> collection demonstration.

Demo Code



using System;/*  www .j a  v  a2  s. c  om*/
using System.Collections.Generic;

class MainClass
{
   static void Main()
   {
      var items = new List<string>();

      Console.WriteLine("Before adding to items: " + $"Count = {items.Count}; Capacity = {items.Capacity}");

      items.Add("red"); // append an item to the List
      items.Insert(0, "yellow"); // insert the value at index 0


      Console.WriteLine("After adding two elements to items: " + $"Count = {items.Count}; Capacity = {items.Capacity}");

      Console.Write("\nDisplay list contents with counter-controlled loop:");
      for (var i = 0; i < items.Count; i++)
      {
         Console.Write($" {items[i]}");
      }

      Console.Write("\nDisplay list contents with foreach statement:");
      foreach (var item in items)
      {
         Console.Write($" {item}");
      }

      items.Add("green"); // add "green" to the end of the List
      items.Add("yellow"); // add "yellow" to the end of the List

      // display List's Count and Capacity after adding two more elements
      Console.WriteLine("\n\nAfter adding two more elements to items: " + $"Count = {items.Count}; Capacity = {items.Capacity}");

      Console.Write("List with two new elements:");
      foreach (var item in items)
      {
         Console.Write($" {item}");
      }

      items.Remove("yellow"); // remove the first "yellow"

      // display the List
      Console.Write("\n\nRemove first instance of yellow:");
      foreach (var item in items)
      {
         Console.Write($" {item}");
      }

      items.RemoveAt(1); // remove item at index 1

      // display the List
      Console.Write("\nRemove second list element (green):");
      foreach (var item in items)
      {
         Console.Write($" {item}");
      }

      // display List's Count and Capacity after removing two elements
      Console.WriteLine("\nAfter removing two elements from items: " + $"Count = {items.Count}; Capacity = {items.Capacity}");

      // check if a value is in the List
      Console.WriteLine("\n\"red\" is " + $"{(items.Contains("red") ? string.Empty : "not ")}in the list");

      items.Add("orange"); // add "orange" to the end of the List
      items.Add("violet"); // add "violet" to the end of the List
      items.Add("blue"); // add "blue" to the end of the List

      // display List's Count and Capacity after adding three elements
      Console.WriteLine("\nAfter adding three more elements to items: " + $"Count = {items.Count}; Capacity = {items.Capacity}");

      // display the List
      Console.Write("List with three new elements:");
      
      foreach (var item in items)
      {
         Console.Write($" {item}");
      }
   }
}

Result


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