Qbservable.Scan<TSource, TAccumulate> Method (IQbservable<TSource>, TAccumulate, Expression<Func<TAccumulate, TSource, TAccumulate>>)

Applies an accumulator function over a queryable observable sequence and returns each intermediate result with the specified source, seed and accumulator.

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

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function Scan(Of TSource, TAccumulate) ( _
    source As IQbservable(Of TSource), _
    seed As TAccumulate, _
    accumulator As Expression(Of Func(Of TAccumulate, TSource, TAccumulate)) _
) As IQbservable(Of TAccumulate)

'Usage
Dim source As IQbservable(Of TSource)
Dim seed As TAccumulate
Dim accumulator As Expression(Of Func(Of TAccumulate, TSource, TAccumulate))
Dim returnValue As IQbservable(Of TAccumulate)

returnValue = source.Scan(seed, accumulator)

public static IQbservable<TAccumulate> Scan<TSource, TAccumulate>(
    this IQbservable<TSource> source,
    TAccumulate seed,
    Expression<Func<TAccumulate, TSource, TAccumulate>> accumulator
)

[ExtensionAttribute]
public:
generic<typename TSource, typename TAccumulate>
static IQbservable<TAccumulate>^ Scan(
    IQbservable<TSource>^ source, 
    TAccumulate seed, 
    Expression<Func<TAccumulate, TSource, TAccumulate>^>^ accumulator
)

static member Scan : 
        source:IQbservable<'TSource> * 
        seed:'TAccumulate * 
        accumulator:Expression<Func<'TAccumulate, 'TSource, 'TAccumulate>> -> IQbservable<'TAccumulate> 

JScript does not support generic types and methods.

Type Parameters

• TSource
  The type of source.

• TAccumulate
  The type of accumulator.

Parameters

• source
  Type: System.Reactive.Linq.IQbservable<TSource>
  A queryable observable sequence to accumulate over.

• seed
  Type: TAccumulate
  The initial accumulator value.

• accumulator
  Type: System.Linq.Expressions.Expression<Func<TAccumulate, TSource, TAccumulate>>
  An accumulator function to be invoked on each element.

Return Value

Type: System.Reactive.Linq.IQbservable<TAccumulate>
A queryable observable sequence containing the accumulated values.

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 .

See Also

Reference

Qbservable Class

Scan Overload

System.Reactive.Linq Namespace