Qbservable.TakeWhile<TSource> Method (IQbservable<TSource>, Expression<Func<TSource, Int32, Boolean>>)
Returns values from a queryable observable sequence as long as a specified condition is true, and then skips the remaining values.
Namespace: System.Reactive.Linq
Assembly: System.Reactive.Providers (in System.Reactive.Providers.dll)
Syntax
'Declaration
<ExtensionAttribute> _
Public Shared Function TakeWhile(Of TSource) ( _
source As IQbservable(Of TSource), _
predicate As Expression(Of Func(Of TSource, Integer, Boolean)) _
) As IQbservable(Of TSource)
'Usage
Dim source As IQbservable(Of TSource)
Dim predicate As Expression(Of Func(Of TSource, Integer, Boolean))
Dim returnValue As IQbservable(Of TSource)
returnValue = source.TakeWhile(predicate)
public static IQbservable<TSource> TakeWhile<TSource>(
this IQbservable<TSource> source,
Expression<Func<TSource, int, bool>> predicate
)
[ExtensionAttribute]
public:
generic<typename TSource>
static IQbservable<TSource>^ TakeWhile(
IQbservable<TSource>^ source,
Expression<Func<TSource, int, bool>^>^ predicate
)
static member TakeWhile :
source:IQbservable<'TSource> *
predicate:Expression<Func<'TSource, int, bool>> -> IQbservable<'TSource>
JScript does not support generic types and methods.
Type Parameters
- TSource
The type source.
Parameters
- source
Type: System.Reactive.Linq.IQbservable<TSource>
A sequence to return elements from.
- predicate
Type: System.Linq.Expressions.Expression<Func<TSource, Int32, Boolean>>
A function to test each source element for a condition.
Return Value
Type: System.Reactive.Linq.IQbservable<TSource>
A queryable observable sequence that contains the elements from the input sequence that occur before the element at which the test no longer passes.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IQbservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .