Hashtable Class in C#

January 21, 2022 C#

In this post, you will learn how to work with the Hashtable class so that you can use that same knowledge and thus evolve.

this class (belonging to the System.Collections library) represents a collection of associations between value pairs;
the first element of the pair is called the key (identifier) and the other is called the content;
the collection of value pair associations are organized according to the hash code of the key.

using System;
using System.Collections;

namespace Base {
  class HashtableClass {
    private Hashtable people = new Hashtable() {
      { "Nelson Silva", 25 },
      { "Larissa Fernandes", 37 }
    };

    public void Run() {
      people.Add("Pedro Henrique", 52);
      people.Add("Raquel Soares", 68);

      people["Pedro Henrique"] = 100;
      people.Remove("Larissa Fernandes");
      people.Clear();

      Console.WriteLine($"Number of people: {people.Count}");

      foreach (DictionaryEntry person in people) {
        Console.WriteLine($"Name: {person.Key}");
        Console.WriteLine($"Age: {person.Value}");
      }
    }
  }
}

/*
  Number of people: 3
  Name: Raquel Soares
  Age: 68
  Name: Nelson Silva
  Age: 25
  Name: Pedro Henrique
  Age: 100
*/

Don’t forget to watch the video and you can always read this post in Portuguese.

Hashtable Class in C#

Happy coding!