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Remove all elements in a collection from a HashSet in C#
To remove all elements in a collection 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("Ryan"); set1.Add("Tom"); set1.Add("Andy"); set1.Add("Tim"); 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)); set2.ExceptWith(set1); // displaying elements in set2, which are not on set1 foreach(string i in set2){ Console.WriteLine(i); } } }
Output
This will produce the following output −
Elements in HashSet1... Ryan Tom Andy Tim Elements in HashSet2... John Jacob Ryan Tom Andy Tim Steve Mark Is HashSet1 equal to HashSet2? = False John Jacob Steve Mark
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("Jacob"); set1.Add("Ryan"); set1.Add("Tom"); set1.Add("Andy"); set1.Add("Tim"); set1.Add("Steve"); set1.Add("Mark"); Console.WriteLine("Elements in HashSet1..."); foreach (string res in set1){ Console.WriteLine(res); } HashSet<string> set2 = new HashSet<string>(); set2.Add("Kevin"); 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)); set2.ExceptWith(set1); // displaying elements in set2, which are not on set1 foreach(string i in set2){ Console.WriteLine(i); } } }
Output
This will produce the following output −
Elements in HashSet1... Jacob Ryan Tom Andy Tim Steve Mark Elements in HashSet2... Kevin Jacob Ryan Tom Andy Tim Steve Mark Is HashSet1 equal to HashSet2? = False Kevin
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