GroupBy(TSource, TKey) Method (IQbservable(TSource), Expression(Func(TSource, TKey)), IEqualityComparer(TKey))

Qbservable.GroupBy<TSource, TKey> Method (IQbservable<TSource>, Expression<Func<TSource, TKey>>, IEqualityComparer<TKey>)

Groups the elements of a queryable observable sequence according to a specified key selector function and comparer.

Namespace:  System.Reactive.Linq
Assembly:  System.Reactive.Providers (in System.Reactive.Providers.dll)

public static IQbservable<IGroupedObservable<TKey, TSource>> GroupBy<TSource, TKey>(
	this IQbservable<TSource> source,
	Expression<Func<TSource, TKey>> keySelector,
	IEqualityComparer<TKey> comparer
)

Type Parameters

TSource

The type source.

TKey

The type key.

Parameters

source
Type: System.Reactive.Linq.IQbservable<TSource>
A queryable observable sequence whose elements to group.
keySelector
Type: System.Linq.Expressions.Expression<Func<TSource, TKey>>
A function to extract the key for each element.
comparer
Type: System.Collections.Generic.IEqualityComparer<TKey>
An equality comparer to compare keys with.

Return Value

Type: System.Reactive.Linq.IQbservable<IGroupedObservable<TKey, TSource>>
A sequence of queryable observable groups, each of which corresponds to a unique key value, containing all elements that share that same key value.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQbservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see https://msdn.microsoft.com/en-us/library/bb384936(v=vs.103).aspx or https://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.
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