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C# | Check if the Hashtable contains a specific Value

C# | Check if a HashSet contains the specified element

Last Updated : 01 Feb, 2019

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A HashSet is an unordered collection of the unique elements. It is found in System.Collections.Generic namespace. It is used in a situation where we want to prevent duplicates from being inserted in the collection. As far as performance is concerned, it is better in comparison to the list. HashSet.Contains(T) Method is used to check whether a HashSet object contains the specified element. Syntax:

  mySet.Contains(T item);

Here, mySet is the name of the HashSet and item is the required element to locate in the HashSet object. Return Type: This method returns true if the HashSet object contains the specified element; otherwise, false. Below given are some examples to understand the implementation in a better way: Example 1:

CSHARP

// C# code to check if a HashSet // contains the specified element using System; using System.Collections.Generic;  class GFG {      // Driver code     public static void Main()     {          // Creating a HashSet of strings         HashSet<string> mySet = new HashSet<string>();          // Inserting elements in HashSet         mySet.Add("DS");         mySet.Add("C++");         mySet.Add("Java");         mySet.Add("JavaScript");          // Check if a HashSet contains         // the specified element         if (mySet.Contains("Java"))             Console.WriteLine("Required Element is present");         else             Console.WriteLine("Required Element is not present");     } }

Output:

  Required Element is present

Example 2:

CSHARP

// C# code to check if a HashSet // contains the specified element using System; using System.Collections.Generic;  class GFG {      // Driver code     public static void Main()     {          // Creating a HashSet of integers         HashSet<int> mySet = new HashSet<int>();          // Inserting elements in HashSet         for (int i = 0; i < 5; i++) {             mySet.Add(i * 2);         }          // Check if a HashSet contains         // the specified element         if (mySet.Contains(5))             Console.WriteLine("Required Element is present");         else             Console.WriteLine("Required Element is not present");     } }

Output:

  Required Element is not present

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.hashset-1.contains?view=netframework-4.7.2

C# | Check if the Hashtable contains a specific Value

S

Sahil_Bansall

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Article Tags :

Misc
C#
CSharp-method
CSharp-Generic-HashSet
CSharp-Generic-Namespace

Practice Tags :

Misc

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