Qbservable.SelectMany<TSource, TCollection, TResult> Method (IQbservable<TSource>, Expression<Func<TSource, IObservable<TCollection>>>, Expression<Func<TSource, TCollection, TResult>>)
Projects each element of a queryable observable sequence to a queryable observable sequence and flattens the resulting queryable observable sequences into one queryable observable sequence.
Namespace: System.Reactive.Linq
Assembly: System.Reactive.Providers (in System.Reactive.Providers.dll)
Syntax
'Declaration
<ExtensionAttribute> _
Public Shared Function SelectMany(Of TSource, TCollection, TResult) ( _
source As IQbservable(Of TSource), _
collectionSelector As Expression(Of Func(Of TSource, IObservable(Of TCollection))), _
resultSelector As Expression(Of Func(Of TSource, TCollection, TResult)) _
) As IQbservable(Of TResult)
'Usage
Dim source As IQbservable(Of TSource)
Dim collectionSelector As Expression(Of Func(Of TSource, IObservable(Of TCollection)))
Dim resultSelector As Expression(Of Func(Of TSource, TCollection, TResult))
Dim returnValue As IQbservable(Of TResult)
returnValue = source.SelectMany(collectionSelector, _
resultSelector)
public static IQbservable<TResult> SelectMany<TSource, TCollection, TResult>(
this IQbservable<TSource> source,
Expression<Func<TSource, IObservable<TCollection>>> collectionSelector,
Expression<Func<TSource, TCollection, TResult>> resultSelector
)
[ExtensionAttribute]
public:
generic<typename TSource, typename TCollection, typename TResult>
static IQbservable<TResult>^ SelectMany(
IQbservable<TSource>^ source,
Expression<Func<TSource, IObservable<TCollection>^>^>^ collectionSelector,
Expression<Func<TSource, TCollection, TResult>^>^ resultSelector
)
static member SelectMany :
source:IQbservable<'TSource> *
collectionSelector:Expression<Func<'TSource, IObservable<'TCollection>>> *
resultSelector:Expression<Func<'TSource, 'TCollection, 'TResult>> -> IQbservable<'TResult>
JScript does not support generic types and methods.
Type Parameters
- TSource
The type of source.
- TCollection
The type of collection.
- TResult
The type of result.
Parameters
- source
Type: System.Reactive.Linq.IQbservable<TSource>
A queryable observable sequence of elements to project.
- collectionSelector
Type: System.Linq.Expressions.Expression<Func<TSource, IObservable<TCollection>>>
A transform function to apply to each element.
- resultSelector
Type: System.Linq.Expressions.Expression<Func<TSource, TCollection, TResult>>
A transform function to apply to each element of the intermediate sequence.
Return Value
Type: System.Reactive.Linq.IQbservable<TResult>
A queryable observable sequence whose elements are the result of invoking the one-to-many transform function collectionSelector on each element of the input sequence and then mapping each of those sequence elements and their corresponding source element to a result element.
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 .