System.Linq.Enumerable.ToHashSet<TSource>(IEnumerable<TSource>) Method

Creates a HashSet<TSource> from an IEnumerable<TSource> by using the default equality comparer for the element type.

Syntax

Parameters

source: An IEnumerable<TSource> to create a HashSet<TSource> from.

Exceptions

TSource: The type of the elements in the sequence.
ArgumentNullException: source is null.

Remarks

If the source sequence contains duplicate values, the resulting HashSet<TSource> will contain only one instance of each value.

This method uses deferred execution. When this method is called, it doesn't immediately return a HashSet<TSource>. It stores the enumerable data as a single object to the type that enables it to perform the set operation. The query that obtains the values is not executed until the object is enumerated, either by calling this method or by using a method that enumerates it, such as Count() or ToArray().

Examples


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

                public class Example
                {
                    public static void Main(string[] args)
                    {
                        List<int> numbers = new List<int> { 1, 2, 2, 3, 4, 4, 4, 5 };

                        HashSet<int> uniqueNumbers = numbers.ToHashSet();

                        // uniqueNumbers will contain: { 1, 2, 3, 4, 5 }
                        foreach (var num in uniqueNumbers)
                        {
                            Console.WriteLine(num);
                        }
                    }
                }

System.Linq.Enumerable.ToHashSet<TSource> Method

Syntax

Parameters

Returns

Exceptions

Remarks

Examples