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M_CodeJam_Collections_EnumerableExtensions_ToHashSet__2_1

Andrew Koryavchenko edited this page Jun 17, 2018 · 5 revisions

EnumerableExtensions.ToHashSet(T, TKey) Method (IEnumerable(T), Func(T, TKey), IEqualityComparer(TKey))

Creates a HashSet(T) from an IEnumerable(T) with the specified equality comparer.

Namespace: CodeJam.Collections
Assembly: CodeJam (in CodeJam.dll) Version: 2.1.0.0

Syntax

C#

public static HashSet<TKey> ToHashSet<T, TKey>(
	this IEnumerable<T> source,
	Func<T, TKey> keySelector,
	IEqualityComparer<TKey> comparer
)

VB

<ExtensionAttribute>
Public Shared Function ToHashSet(Of T, TKey) ( 
	source As IEnumerable(Of T),
	keySelector As Func(Of T, TKey),
	comparer As IEqualityComparer(Of TKey)
) As HashSet(Of TKey)

F#

[<ExtensionAttribute>]
static member ToHashSet : 
        source : IEnumerable<'T> * 
        keySelector : Func<'T, 'TKey> * 
        comparer : IEqualityComparer<'TKey> -> HashSet<'TKey> 

Parameters

 

source
Type: System.Collections.Generic.IEnumerable(T)
The IEnumerable(T) to create a HashSet(T) from.
keySelector
Type: System.Func(T, TKey)
A function to extract a key from each element.
comparer
Type: System.Collections.Generic.IEqualityComparer(TKey)
The IEqualityComparer(T) implementation to use to comparing values in the set, or null to use the default implementation for the set type.

Type Parameters

 

T
The type of the elements of source.
TKey
The type of the key returned by keySelector.

Return Value

Type: HashSet(TKey)
A HashSet(T) that contains keys from the input sequence.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable(T). When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

See Also

Reference

EnumerableExtensions Class
ToHashSet Overload
CodeJam.Collections Namespace

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