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Observable.Where<TSource> Method (IObservable<TSource>, Func<TSource, Int32, Boolean>)

Filters the elements of an observable sequence based on a predicate by incorporating the element's index.

Namespace:  System.Reactive.Linq
Assembly:  System.Reactive (in System.Reactive.dll)

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

Type Parameters

TSource

The type source.

Parameters

source
Type: System.IObservable<TSource>
An observable sequence whose elements to filter.
predicate
Type: System.Func<TSource, Int32, Boolean>
A function to test each source element for a condition; the second parameter of the function represents the index of the source element.

Return Value

Type: System.IObservable<TSource>
An observable sequence that contains elements from the input sequence that satisfy the condition.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IObservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see http://msdn.microsoft.com/en-us/library/bb384936(v=vs.103).aspx or http://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.
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