)} ,System.Collections.Generic.IEqualityComparer{--0})} ,System.Func{--0,--1})} ,System.Func{--0,--1},System.Collections.Generic.IEqualityComparer{--1})}

Observable.Distinct(IObservable) method¶

Defined in

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

Applies to

netstandard2.0

Overloads¶

1. public static IObservable<TSource> Distinct<TSource>(this IObservable<TSource> source)
2. public static IObservable<TSource> Distinct<TSource>(this IObservable<TSource> source, IEqualityComparer<TSource> comparer)
3. public static IObservable<TSource> Distinct<TSource, TKey>(this IObservable<TSource> source, Func<TSource, TKey> keySelector)
4. public static IObservable<TSource> Distinct<TSource, TKey>(this IObservable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey> comparer)

1. Overload¶

public static IObservable<TSource> Distinct<TSource>(this IObservable<TSource> source)

Summary: Returns an observable sequence that contains only distinct elements.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	An observable sequence to retain distinct elements for.

Returns: IObservable -- An observable sequence only containing the distinct elements from the source sequence.

Remarks

Usage of this operator should be considered carefully due to the maintenance of an internal lookup structure which can grow large.

Exceptions

Type	Condition
System.ArgumentNullException	`source` is null.

2. Overload¶

public static IObservable<TSource> Distinct<TSource>(this IObservable<TSource> source, IEqualityComparer<TSource> comparer)

Summary: Returns an observable sequence that contains only distinct elements according to the comparer.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.

Parameters

Name	Type	Description
`source`	IObservable	An observable sequence to retain distinct elements for.
`comparer`	IEqualityComparer	Equality comparer for source elements.

Returns: IObservable -- An observable sequence only containing the distinct elements from the source sequence.

Remarks

Usage of this operator should be considered carefully due to the maintenance of an internal lookup structure which can grow large.

Exceptions

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

3. Overload¶

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

Summary: Returns an observable sequence that contains only distinct elements according to the keySelector.

Type parameters

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

Parameters

Name	Type	Description
`source`	IObservable	An observable sequence to retain distinct elements for.
`keySelector`	Func	A function to compute the comparison key for each element.

Returns: IObservable -- An observable sequence only containing the distinct elements, based on a computed key value, from the source sequence.

Remarks

Usage of this operator should be considered carefully due to the maintenance of an internal lookup structure which can grow large.

Exceptions

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

4. Overload¶

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

Summary: Returns an observable sequence that contains only distinct elements according to the keySelector and the comparer.

Type parameters

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

Parameters

Name	Type	Description
`source`	IObservable	An observable sequence to retain distinct elements for.
`keySelector`	Func	A function to compute the comparison key for each element.
`comparer`	IEqualityComparer	Equality comparer for source elements.

Returns: IObservable -- An observable sequence only containing the distinct elements, based on a computed key value, from the source sequence.

Remarks

Usage of this operator should be considered carefully due to the maintenance of an internal lookup structure which can grow large.

Exceptions

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