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Observable.GroupBy(IObservable, Func) method¶

Defined in

Type: Observable Namespace: System.Reactive.Linq Assembly: System.Reactive.dll

Applies to

netstandard2.0

Overloads¶

1. public static IObservable<IGroupedObservable<TKey, TSource>> GroupBy<TSource, TKey>(this IObservable<TSource> source, Func<TSource, TKey> keySelector)
2. public static IObservable<IGroupedObservable<TKey, TSource>> GroupBy<TSource, TKey>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey> comparer)
3. public static IObservable<IGroupedObservable<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector)
4. public static IObservable<IGroupedObservable<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey> comparer)
5. public static IObservable<IGroupedObservable<TKey, TSource>> GroupBy<TSource, TKey>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, int capacity)
6. public static IObservable<IGroupedObservable<TKey, TSource>> GroupBy<TSource, TKey>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, int capacity, IEqualityComparer<TKey> comparer)
7. public static IObservable<IGroupedObservable<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, int capacity)
8. public static IObservable<IGroupedObservable<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, int capacity, IEqualityComparer<TKey> comparer)

1. Overload¶

public static IObservable<IGroupedObservable<TKey, TSource>> GroupBy<TSource, TKey>(this IObservable<TSource> source, Func<TSource, TKey> keySelector)

Summary: Groups the elements of an observable sequence according to a specified key selector function.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.
`TKey`	The type of the grouping key computed for each element in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	An observable sequence whose elements to group.
`keySelector`	Func	A function to extract the key for each element.

Returns: IObservable> -- A sequence of observable groups, each of which corresponds to a unique key value, containing all elements that share that same key value.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `keySelector` is null.

2. Overload¶

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

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

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.
`TKey`	The type of the grouping key computed for each element in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	An observable sequence whose elements to group.
`keySelector`	Func	A function to extract the key for each element.
`comparer`	IEqualityComparer	An equality comparer to compare keys with.

Returns: IObservable> -- A sequence of observable groups, each of which corresponds to a unique key value, containing all elements that share that same key value.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `keySelector` or `comparer` is null.

3. Overload¶

public static IObservable<IGroupedObservable<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector)

Summary: Groups the elements of an observable sequence and selects the resulting elements by using a specified function.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.
`TKey`	The type of the grouping key computed for each element in the source sequence.
`TElement`	The type of the elements within the groups computed for each element in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	An observable sequence whose elements to group.
`keySelector`	Func	A function to extract the key for each element.
`elementSelector`	Func	A function to map each source element to an element in an observable group.

Returns: IObservable> -- A sequence of observable groups, each of which corresponds to a unique key value, containing all elements that share that same key value.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `keySelector` or `elementSelector` is null.

4. Overload¶

public static IObservable<IGroupedObservable<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey> comparer)

Summary: Groups the elements of an observable sequence according to a specified key selector function and comparer and selects the resulting elements by using a specified function.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.
`TKey`	The type of the grouping key computed for each element in the source sequence.
`TElement`	The type of the elements within the groups computed for each element in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	An observable sequence whose elements to group.
`keySelector`	Func	A function to extract the key for each element.
`elementSelector`	Func	A function to map each source element to an element in an observable group.
`comparer`	IEqualityComparer	An equality comparer to compare keys with.

Returns: IObservable> -- A sequence of observable groups, each of which corresponds to a unique key value, containing all elements that share that same key value.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `keySelector` or `elementSelector` or `comparer` is null.

5. Overload¶

public static IObservable<IGroupedObservable<TKey, TSource>> GroupBy<TSource, TKey>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, int capacity)

Summary: Groups the elements of an observable sequence with the specified initial capacity according to a specified key selector function.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.
`TKey`	The type of the grouping key computed for each element in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	An observable sequence whose elements to group.
`keySelector`	Func	A function to extract the key for each element.
`capacity`	int	The initial number of elements that the underlying dictionary can contain.

Returns: IObservable> -- A sequence of observable groups, each of which corresponds to a unique key value, containing all elements that share that same key value.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `keySelector` is null.
System.ArgumentOutOfRangeException	`capacity` is less than 0.

6. Overload¶

public static IObservable<IGroupedObservable<TKey, TSource>> GroupBy<TSource, TKey>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, int capacity, IEqualityComparer<TKey> comparer)

Summary: Groups the elements of an observable sequence with the specified initial capacity according to a specified key selector function and comparer.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.
`TKey`	The type of the grouping key computed for each element in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	An observable sequence whose elements to group.
`keySelector`	Func	A function to extract the key for each element.
`capacity`	int	The initial number of elements that the underlying dictionary can contain.
`comparer`	IEqualityComparer	An equality comparer to compare keys with.

Returns: IObservable> -- A sequence of observable groups, each of which corresponds to a unique key value, containing all elements that share that same key value.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `keySelector` or `comparer` is null.
System.ArgumentOutOfRangeException	`capacity` is less than 0.

7. Overload¶

public static IObservable<IGroupedObservable<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, int capacity)

Summary: Groups the elements of an observable sequence with the specified initial capacity and selects the resulting elements by using a specified function.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.
`TKey`	The type of the grouping key computed for each element in the source sequence.
`TElement`	The type of the elements within the groups computed for each element in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	An observable sequence whose elements to group.
`keySelector`	Func	A function to extract the key for each element.
`elementSelector`	Func	A function to map each source element to an element in an observable group.
`capacity`	int	The initial number of elements that the underlying dictionary can contain.

Returns: IObservable> -- A sequence of observable groups, each of which corresponds to a unique key value, containing all elements that share that same key value.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `keySelector` or `elementSelector` is null.
System.ArgumentOutOfRangeException	`capacity` is less than 0.

8. Overload¶

public static IObservable<IGroupedObservable<TKey, TElement>> GroupBy<TSource, TKey, TElement>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, int capacity, IEqualityComparer<TKey> comparer)

Summary: Groups the elements of an observable sequence with the specified initial capacity according to a specified key selector function and comparer and selects the resulting elements by using a specified function.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.
`TKey`	The type of the grouping key computed for each element in the source sequence.
`TElement`	The type of the elements within the groups computed for each element in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	An observable sequence whose elements to group.
`keySelector`	Func	A function to extract the key for each element.
`elementSelector`	Func	A function to map each source element to an element in an observable group.
`capacity`	int	The initial number of elements that the underlying dictionary can contain.
`comparer`	IEqualityComparer	An equality comparer to compare keys with.

Returns: IObservable> -- A sequence of observable groups, each of which corresponds to a unique key value, containing all elements that share that same key value.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `keySelector` or `elementSelector` or `comparer` is null.
System.ArgumentOutOfRangeException	`capacity` is less than 0.