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)

generic<typename TSource>
static IQbservable<TSource>^ TakeWhile(
	IQbservable<TSource>^ source, 
	Expression<Func<TSource, int, bool>^>^ predicate

Type Parameters


The type source.


Type: System.Reactive.Linq::IQbservable<TSource>
A sequence to return elements from.
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 https://msdn.microsoft.com/en-us/library/bb384936(v=vs.103).aspx or https://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.