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

Observable.DistinctUntilChanged(IObservable) method¶

Defined in

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

Applies to

netstandard2.0

Overloads¶

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

1. Overload¶

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

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

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

Exceptions

Type	Condition
System.ArgumentNullException	`source` is null.

2. Overload¶

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

Summary: Returns an observable sequence that contains only distinct contiguous 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 contiguous elements for.
`comparer`	IEqualityComparer	Equality comparer for source elements.

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

Exceptions

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

3. Overload¶

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

Summary: Returns an observable sequence that contains only distinct contiguous 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 contiguous elements for, based on a computed key value.
`keySelector`	Func	A function to compute the comparison key for each element.

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

Exceptions

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

4. Overload¶

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

Summary: Returns an observable sequence that contains only distinct contiguous 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 contiguous elements for, based on a computed key value.
`keySelector`	Func	A function to compute the comparison key for each element.
`comparer`	IEqualityComparer	Equality comparer for computed key values.

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

Exceptions

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