Qbservable.Select<TSource, TResult> Method (IQbservable<TSource>, Expression<Func<TSource, Int32, TResult>>)

Projects each element of a queryable observable sequence into a new form by incorporating the element’s index with the specified source and selector.

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

public static IQbservable<TResult> Select<TSource, TResult>(
	this IQbservable<TSource> source,
	Expression<Func<TSource, int, TResult>> selector

Type Parameters


The type of source.


The type of result.


Type: System.Reactive.Linq.IQbservable<TSource>
A sequence of elements to invoke a transform function on.
Type: System.Linq.Expressions.Expression<Func<TSource, Int32, TResult>>
A transform function to apply to each source element.

Return Value

Type: System.Reactive.Linq.IQbservable<TResult>
A queryable observable sequence into a new form.

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.