Collections in C#

#A collection in C# is a HashSet. HashSet in C# eliminates duplicate strings or elements in an array. In C#, it is an optimized set collection

Declare HashSet -

var h = new HashSet<string>(arr1);

Above, we have set the declared array arr1 in the HashSet.

Now set it on the array to remove duplicate words -

string[] arr2 = h.ToArray();

Let us see an example of removing duplicate strings using C# HashSet.

Here, we have repeated elements -

Example

using System;
using System.Collections.Generic;
using System.Linq;

class Program {
   static void Main() {
      string[] arr1 = {"Table","Chair","Pen","Clip","Table"};
      Console.WriteLine(string.Join(",", arr1));

      // HashSet
      var h = new HashSet<string>(arr1);

      // eliminates duplicate words
      string[] arr2 = h.ToArray();
      Console.WriteLine(string.Join(",", arr2));
   }
}

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