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Qbservable.MaxBy<TSource, TKey> Method (IQbservable<TSource>, Expression<Func<TSource, TKey>>)

Returns the elements in a queryable observable sequence with the maximum key value.

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

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function MaxBy(Of TSource, TKey) ( _
    source As IQbservable(Of TSource), _
    keySelector As Expression(Of Func(Of TSource, TKey)) _
) As IQbservable(Of IList(Of TSource))

'Usage
Dim source As IQbservable(Of TSource)
Dim keySelector As Expression(Of Func(Of TSource, TKey))
Dim returnValue As IQbservable(Of IList(Of TSource))

returnValue = source.MaxBy(keySelector)

public static IQbservable<IList<TSource>> MaxBy<TSource, TKey>(
    this IQbservable<TSource> source,
    Expression<Func<TSource, TKey>> keySelector
)

[ExtensionAttribute]
public:
generic<typename TSource, typename TKey>
static IQbservable<IList<TSource>^>^ MaxBy(
    IQbservable<TSource>^ source, 
    Expression<Func<TSource, TKey>^>^ keySelector
)

static member MaxBy : 
        source:IQbservable<'TSource> * 
        keySelector:Expression<Func<'TSource, 'TKey>> -> IQbservable<IList<'TSource>> 

JScript does not support generic types and methods.

Type Parameters

  • TSource
    The type of source.
  • TKey
    The type of key.

Parameters

Return Value

Type: System.Reactive.Linq.IQbservable<IList<TSource>>
The elements in a queryable observable sequence with the maximum key value.

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

MaxBy Overload

System.Reactive.Linq Namespace