,System.Func{--0,System.Boolean})} ,System.Func{--0,System.Int32,System.Boolean})}

Observable.TakeWhile(IObservable, Func) method¶

Defined in

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

Applies to

netstandard2.0

Overloads¶

1. public static IObservable<TSource> TakeWhile<TSource>(this IObservable<TSource> source, Func<TSource, bool> predicate)
2. public static IObservable<TSource> TakeWhile<TSource>(this IObservable<TSource> source, Func<TSource, int, bool> predicate)

1. Overload¶

public static IObservable<TSource> TakeWhile<TSource>(this IObservable<TSource> source, Func<TSource, bool> predicate)

Summary: Returns elements from an observable sequence as long as a specified condition is true.

Type parameters

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

Parameters

Name	Type	Description
`source`	IObservable	A sequence to return elements from.
`predicate`	Func	A function to test each element for a condition.

Returns: IObservable -- An observable sequence that contains the elements from the input sequence that occur before the element at which the test no longer passes.

Exceptions

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

2. Overload¶

public static IObservable<TSource> TakeWhile<TSource>(this IObservable<TSource> source, Func<TSource, int, bool> predicate)

Summary: Returns elements from an observable sequence as long as a specified condition is true. The element's index is used in the logic of the predicate function.

Type parameters

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

Parameters

Name	Type	Description
`source`	IObservable	A sequence to return elements from.
`predicate`	Func	A function to test each element for a condition; the second parameter of the function represents the index of the source element.

Returns: IObservable -- An observable sequence that contains the elements from the input sequence that occur before the element at which the test no longer passes.

Exceptions

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