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AsyncEnumerableToLookupTSource, TKey Method (IAsyncEnumerableTSource, FuncTSource, TKey, IEqualityComparerTKey, CancellationToken)

Namespace: System.Linq
Assembly: System.Interactive.Async (in System.Interactive.Async.dll) Version: 1.2.0.0
Syntax
C#
Copy
public static Task<ILookup<TKey, TSource>> ToLookup<TSource, TKey>(
	this IAsyncEnumerable<TSource> source,
	Func<TSource, TKey> keySelector,
	IEqualityComparer<TKey> comparer,
	CancellationToken cancellationToken
)

Parameters

source
Type: System.Collections.GenericIAsyncEnumerableTSource
keySelector
Type: SystemFuncTSource, TKey
comparer
Type: System.Collections.GenericIEqualityComparerTKey
cancellationToken
Type: System.ThreadingCancellationToken

Type Parameters

TSource
TKey

Return Value

Type: TaskILookupTKey, TSource

Usage Note

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