MoreEnumerable.ToLookup<TKey, TValue> Method (IEnumerable<KeyValuePair<TKey, TValue>>, IEqualityComparer<TKey>)

Creates a ILookup<TKey, TElement> from a sequence of KeyValuePair<TKey, TValue> elements. An additional parameter specifies a comparer for keys.

Namespace: MoreLinq
Assembly: MoreLinq (in MoreLinq.dll) Version: 3.0.0

Syntax

C++

Copy

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

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

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

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

Parameters

source: Type: System.Collections.Generic.IEnumerable<KeyValuePair<TKey, TValue>>
The source sequence of key-value pairs.
comparer: Type: System.Collections.Generic.IEqualityComparer<TKey>
The comparer for keys.

Type Parameters

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

Return Value

Type: ILookup<TKey, TValue>
A ILookup<TKey, TElement> 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 IEnumerable<KeyValuePair<TKey, 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).

Reference

MoreEnumerable Class

ToLookup Overload

MoreLinq Namespace