Method DistinctUntilChanged

View Source

DistinctUntilChanged<TSource>(IAsyncEnumerable<TSource>)

Returns consecutive distinct elements by using the default equality comparer to compare values.

Declaration
public static IAsyncEnumerable<TSource> DistinctUntilChanged<TSource>(this IAsyncEnumerable<TSource> source)
Parameters
Type Name Description
IAsyncEnumerable<TSource> source

Source sequence.
Returns
Type Description
IAsyncEnumerable<TSource>

Sequence without adjacent non-distinct elements.
Type Parameters
Name Description
TSource

Source sequence element type.
Exceptions
Type Condition
ArgumentNullException

source is null.
View Source

DistinctUntilChanged<TSource>(IAsyncEnumerable<TSource>, IEqualityComparer<TSource>?)

Returns consecutive distinct elements by using the specified equality comparer to compare values.

Declaration
public static IAsyncEnumerable<TSource> DistinctUntilChanged<TSource>(this IAsyncEnumerable<TSource> source, IEqualityComparer<TSource>? comparer)
Parameters
Type Name Description
IAsyncEnumerable<TSource> source

Source sequence.
IEqualityComparer<TSource> comparer

Comparer used to compare values.
Returns
Type Description
IAsyncEnumerable<TSource>

Sequence without adjacent non-distinct elements.
Type Parameters
Name Description
TSource

Source sequence element type.
Exceptions
Type Condition
ArgumentNullException

source is null.
View Source

DistinctUntilChanged<TSource, TKey>(IAsyncEnumerable<TSource>, Func<TSource, TKey>)

Returns consecutive distinct elements based on a key value by using the specified equality comparer to compare key values.

Declaration
public static IAsyncEnumerable<TSource> DistinctUntilChanged<TSource, TKey>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector)
Parameters
Type Name Description
IAsyncEnumerable<TSource> source

Source sequence.
Func<TSource, TKey> keySelector

Key selector.
Returns
Type Description
IAsyncEnumerable<TSource>

Sequence without adjacent non-distinct elements.
Type Parameters
Name Description
TSource

Source sequence element type.
TKey

Key type.
Exceptions
Type Condition
ArgumentNullException

source or keySelector is null.
View Source

DistinctUntilChanged<TSource, TKey>(IAsyncEnumerable<TSource>, Func<TSource, ValueTask<TKey>>)

Returns consecutive distinct elements based on a key value by using the specified equality comparer to compare key values.

Declaration
public static IAsyncEnumerable<TSource> DistinctUntilChanged<TSource, TKey>(this IAsyncEnumerable<TSource> source, Func<TSource, ValueTask<TKey>> keySelector)
Parameters
Type Name Description
IAsyncEnumerable<TSource> source

Source sequence.
Func<TSource, ValueTask<TKey>> keySelector

Key selector.
Returns
Type Description
IAsyncEnumerable<TSource>

Sequence without adjacent non-distinct elements.
Type Parameters
Name Description
TSource

Source sequence element type.
TKey

Key type.
Exceptions
Type Condition
ArgumentNullException

source or keySelector is null.
View Source

DistinctUntilChanged<TSource, TKey>(IAsyncEnumerable<TSource>, Func<TSource, TKey>, IEqualityComparer<TKey>?)

Returns consecutive distinct elements based on a key value by using the specified equality comparer to compare key values.

Declaration
public static IAsyncEnumerable<TSource> DistinctUntilChanged<TSource, TKey>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey>? comparer)
Parameters
Type Name Description
IAsyncEnumerable<TSource> source

Source sequence.
Func<TSource, TKey> keySelector

Key selector.
IEqualityComparer<TKey> comparer

Comparer used to compare key values.
Returns
Type Description
IAsyncEnumerable<TSource>

Sequence without adjacent non-distinct elements.
Type Parameters
Name Description
TSource

Source sequence element type.
TKey

Key type.
Exceptions
Type Condition
ArgumentNullException

source or keySelector is null.
View Source

DistinctUntilChanged<TSource, TKey>(IAsyncEnumerable<TSource>, Func<TSource, ValueTask<TKey>>, IEqualityComparer<TKey>?)

Returns consecutive distinct elements based on a key value by using the specified equality comparer to compare key values.

Declaration
public static IAsyncEnumerable<TSource> DistinctUntilChanged<TSource, TKey>(this IAsyncEnumerable<TSource> source, Func<TSource, ValueTask<TKey>> keySelector, IEqualityComparer<TKey>? comparer)
Parameters
Type Name Description
IAsyncEnumerable<TSource> source

Source sequence.
Func<TSource, ValueTask<TKey>> keySelector

Key selector.
IEqualityComparer<TKey> comparer

Comparer used to compare key values.
Returns
Type Description
IAsyncEnumerable<TSource>

Sequence without adjacent non-distinct elements.
Type Parameters
Name Description
TSource

Source sequence element type.
TKey

Key type.
Exceptions
Type Condition
ArgumentNullException

source or keySelector is null.