Qbservable.SelectMany<TSource, TResult> Method (IQbservable<TSource>, Expression<Func<TSource, IObservable<TResult>>>, Expression<Func<Exception, IObservable<TResult>>>, Expression<Func<IObservable<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, TResult) ( _
source As IQbservable(Of TSource), _
onNext As Expression(Of Func(Of TSource, IObservable(Of TResult))), _
onError As Expression(Of Func(Of Exception, IObservable(Of TResult))), _
onCompleted As Expression(Of Func(Of IObservable(Of TResult))) _
) As IQbservable(Of TResult)
'Usage
Dim source As IQbservable(Of TSource)
Dim onNext As Expression(Of Func(Of TSource, IObservable(Of TResult)))
Dim onError As Expression(Of Func(Of Exception, IObservable(Of TResult)))
Dim onCompleted As Expression(Of Func(Of IObservable(Of TResult)))
Dim returnValue As IQbservable(Of TResult)
returnValue = source.SelectMany(onNext, _
onError, onCompleted)
public static IQbservable<TResult> SelectMany<TSource, TResult>(
this IQbservable<TSource> source,
Expression<Func<TSource, IObservable<TResult>>> onNext,
Expression<Func<Exception, IObservable<TResult>>> onError,
Expression<Func<IObservable<TResult>>> onCompleted
)
[ExtensionAttribute]
public:
generic<typename TSource, typename TResult>
static IQbservable<TResult>^ SelectMany(
IQbservable<TSource>^ source,
Expression<Func<TSource, IObservable<TResult>^>^>^ onNext,
Expression<Func<Exception^, IObservable<TResult>^>^>^ onError,
Expression<Func<IObservable<TResult>^>^>^ onCompleted
)
static member SelectMany :
source:IQbservable<'TSource> *
onNext:Expression<Func<'TSource, IObservable<'TResult>>> *
onError:Expression<Func<Exception, IObservable<'TResult>>> *
onCompleted:Expression<Func<IObservable<'TResult>>> -> IQbservable<'TResult>
JScript does not support generic types and methods.
Type Parameters
- TSource
The type of source.
- TResult
The type of result.
Parameters
- source
Type: System.Reactive.Linq.IQbservable<TSource>
A queryable observable sequence of elements to project.
- onNext
Type: System.Linq.Expressions.Expression<Func<TSource, IObservable<TResult>>>
A transform function to apply to each element.
- onError
Type: System.Linq.Expressions.Expression<Func<Exception, IObservable<TResult>>>
A transform function to apply when an error occurs in the source sequence.
- onCompleted
Type: System.Linq.Expressions.Expression<Func<IObservable<TResult>>>
A transform function to apply when the end of the source sequence is reached.
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 corresponding to each notification in the input sequence.
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 .