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Remove all elements from a HashSet in C#
To remove all elements from a HashSet, the code is as follows −
Example
using System;
using System.Collections.Generic;
public class Demo {
public static void Main(String[] args){
HashSet<string> set1 = new HashSet<string>();
set1.Add("A");
set1.Add("B");
set1.Add("C");
set1.Add("D");
set1.Add("E");
set1.Add("F");
set1.Add("G");
set1.Add("H");
Console.WriteLine("Elements in HashSet1...");
foreach (string res in set1){
Console.WriteLine(res);
}
HashSet<string> set2 = new HashSet<string>();
set2.Add("John");
set2.Add("Jacob");
set2.Add("Ryan");
set2.Add("Tom");
set2.Add("Andy");
set2.Add("Tim");
set2.Add("Steve");
set2.Add("Mark");
Console.WriteLine("Elements in HashSet2...");
foreach (string res in set2){
Console.WriteLine(res);
}
Console.WriteLine("Is HashSet1 equal to HashSet2? = "+set1.Equals(set2));
Console.WriteLine("Count of HashSet2 = "+set2.Count);
set2.Clear();
Console.WriteLine("Count of HashSet2 (updated) = "+set2.Count);
}
}Output
This will produce the following output −
Elements in HashSet1... A B C D E F G H Elements in HashSet2... John Jacob Ryan Tom Andy Tim Steve Mark Is HashSet1 equal to HashSet2? = False Count of HashSet2 = 8 Count of HashSet2 (updated) = 0
Example
Let us see another example −
using System;
using System.Collections.Generic;
public class Demo {
public static void Main(String[] args){
HashSet<string> set1 = new HashSet<string>();
set1.Add("A");
set1.Add("B");
set1.Add("C");
set1.Add("D");
set1.Add("E");
set1.Add("F");
set1.Add("G");
set1.Add("H");
Console.WriteLine("Elements in HashSet...");
foreach (string res in set1){
Console.WriteLine(res);
}
Console.WriteLine("Count of HashSet1 = "+set1.Count);
set1.Clear();
Console.WriteLine("Count of HashSet1 (updated) = "+set1.Count);
}
}Output
This will produce the following output −
Elements in HashSet... A B C D E F G H Count of HashSet1 = 8 Count of HashSet1 (updated) = 0
Updated on: 05-Dec-2019
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