Class LastOrDefault

Namespace

Bonsai.Reactive

Assembly

Bonsai.Core.dll

Represents an operator that returns the last element of an observable sequence, or a default value if no such element exists.

If the sequence has no elements, LastOrDefault will emit a default value before terminating successfully. This is a subtle but important difference between the LastOrDefault operator and TakeLast(1), which will also complete successfully when the source sequence is empty, but will not emit any values.

Tip

LastOrDefault is one of the simplest and most efficient ways of capturing the end of an observable sequence explicitly as a notification in the workflow. You can use it to react to the termination of a sequence regardless of whether that sequence produces values.

public class LastOrDefault : Combinator

Inheritance

object

Combinator

LastOrDefault

Inherited Members

object.ToString()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

Methods

Process<TSource>(IObservable<TSource>)

Returns the last element of an observable sequence, or a default value if no such element exists.

public override IObservable<TSource> Process<TSource>(IObservable<TSource> source)

Parameters

source IObservable<TSource>

The sequence to take the last element from.

Returns

IObservable<TSource>

An observable sequence containing the last element of the source sequence, or a default value if no such element exists.

Type Parameters

TSource

The type of the elements in the source sequence.