MoreEnumerableToLookupTKey, TValue(IEnumerableValueTupleTKey, TValue, IEqualityComparerTKey) Method

Creates a Lookup from a sequence of tuples of 2 where the first item is the key and the second the value. An additional parameter specifies a comparer for keys.

Definition

Namespace: MoreLinq
Assembly: MoreLinq (in MoreLinq.dll) Version: 4.1.0+0e154ef592f33ce0f6f3d534a9eedee273f0ce72

C#

public static ILookup<TKey, TValue> ToLookup<TKey, TValue>(
	this IEnumerable<(TKey , TValue )> source,
	IEqualityComparer<TKey>? comparer
)

VB

<ExtensionAttribute>
Public Shared Function ToLookup(Of TKey, TValue) ( 
	source As IEnumerable(Of ( As TKey,  As TValue)),
	comparer As IEqualityComparer(Of TKey)
) As ILookup(Of TKey, TValue)

C++

public:
[ExtensionAttribute]
generic<typename TKey, typename TValue>
static ILookup<TKey, TValue>^ ToLookup(
	IEnumerable<ValueTuple<TKey, TValue>>^ source, 
	IEqualityComparer<TKey>^ comparer
)

F#

[<ExtensionAttribute>]
static member ToLookup : 
        source : IEnumerable<ValueTuple<'TKey, 'TValue>> * 
        comparer : IEqualityComparer<'TKey> -> ILookup<'TKey, 'TValue>

Parameters

source IEnumerableValueTupleTKey, TValue: The source sequence of tuples of 2.
comparer IEqualityComparerTKey: The comparer for keys.

Type Parameters

TKey: The type of the key.
TValue: The type of the value.

Return Value

ILookupTKey, TValue
A Lookup containing the values mapped to their keys.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerableValueTupleTKey, TValue. 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).