,System.Linq.Expressions.Expression{System.Func{--0,System.Boolean}})} ,System.Linq.Expressions.Expression{System.Func{--0,System.Int32,System.Boolean}})}

Qbservable.TakeWhile(IQbservable, Expression>) method¶

Defined in

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

Applies to

netstandard2.0

Overloads¶

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

1. Overload¶

public static IQbservable<TSource> TakeWhile<TSource>(this IQbservable<TSource> source, Expression<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`	[IQbservable](#	A sequence to return elements from.
`predicate`	Expression>	A function to test each element for a condition.

Returns: IQbservable -- 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 IQbservable<TSource> TakeWhile<TSource>(this IQbservable<TSource> source, Expression<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`	[IQbservable](#	A sequence to return elements from.
`predicate`	Expression>	A function to test each element for a condition; the second parameter of the function represents the index of the source element.

Returns: IQbservable -- 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.