AsyncQueryable.ToLookup(TSource, TKey) Method (IAsyncQueryable(TSource), Expression(Func(TSource, TKey)))

ToLookup(TSource, TKey, TElement) Method (IAsyncQueryable(TSource), Expression(Func(TSource, TKey)), Expression(Func(TSource, TElement)), IEqualityComparer(TKey))

ToLookup(TSource, TKey, TElement) Method (IAsyncQueryable(TSource), Expression(Func(TSource, TKey)), Expression(Func(TSource, TElement)), CancellationToken)

ToLookup(TSource, TKey, TElement) Method (IAsyncQueryable(TSource), Expression(Func(TSource, TKey)), Expression(Func(TSource, TElement)), IEqualityComparer(TKey), CancellationToken)

AsyncQueryableToLookupTSource, TKey Method (IAsyncQueryableTSource, ExpressionFuncTSource, TKey)

Namespace: System.Linq
Assembly: System.Interactive.Async.Providers (in System.Interactive.Async.Providers.dll) Version: 1.2.0.0

Syntax

Copy

public static Task<ILookup<TKey, TSource>> ToLookup<TSource, TKey>(
	this IAsyncQueryable<TSource> source,
	Expression<Func<TSource, TKey>> keySelector
)

Parameters

source: Type: System.LinqIAsyncQueryableTSource
keySelector: Type: System.Linq.ExpressionsExpressionFuncTSource, TKey

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 IAsyncQueryableTSource. 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

AsyncQueryable Class

ToLookup Overload

System.Linq Namespace