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Lists in C#

In this article, we will learn about the List class.

The List is a collection of strongly typed objects that can be accessed by index and having methods for sorting, searching, and modifying list. It comes under System.Collection.Generic namespace.

Creating a List

We create a list in C# using the following syntax:
List<T> l1 = new List<T>();
<T> here denotes any datatype of which we want to create a list of.


Properties of List

  • Count: This property gets the number of nodes actually contained in the List.</li>
  • Capacity: Gets or sets the total number of elements the internal data structure can hold without resizing..
  • List[Int32]: Gets or sets the element at the specified index.
  • </ul>

    Methods of List

    • Add(T): Adds the element at the end of the List.</li>
    • AddRange(IEnumerable)</code>: Adds the elements of the specified collection to the end of the List.</li>
    • Contains(T): Determines whether a value is in the List.</li>
    • Remove(T): Removes the first occurrence of the specified value from the List.</li>
    • RemoveAt(ind): Removes the element at the specified index.
    • Sort(): Sorts the elements in the entire List using the default comparer.</li>
    • Insert(ind, T): Inserts T at the specified index.
    • Clear(): Removes all the elements from the List.</li> </ul>

      List Operation Examples:

      Different List operations are demonstrated in the example below:

      using System;
      using System.Collections.Generic;
      namespace ListDemo {
          class Example {
              static void Main(string[] args) {
                  List < int > L = new List < int > ();
                  L.Add(5);          // Adds to the end
                  L.Add(2);          
                  L.Add(4);
                  L.Add(9);
                  foreach(int i in L) {
                      Console.Write(i + " ");
                  }
                  Console.WriteLine();
                  L.Sort();                // Sorts the list in ascending order
                  foreach(int i in L) {
                      Console.Write(i + " ");
                  }
                  Console.WriteLine();
                  L.RemoveAt(1);           // Removes the elements from the 1st index
                  L.Remove(9);             // Removes first occurenece of 9
                  foreach(int i in L) {
                      Console.Write(i + " ");
                  }
                  Console.WriteLine();
                  Console.WriteLine(L.Contains(2));    // Checks if 2 is present in the list
                  Console.WriteLine(L.Count);          // Count returns the number of elements present
              }
          }
      }
      

      Output:

      5 2 4 9
      2 4 5 9
      2 5
      True
      2

      Task

      In the editor below, perform the different tasks as directed.

Start solving Lists in C# on Interview Code Editor
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