Observable.MaxBy<TSource, TKey> Method (IObservable<TSource>, Func<TSource, TKey>, IComparer<TKey>)
Returns the elements in an observable sequence with the maximum key value.
Namespace: System.Reactive.Linq
Assembly: System.Reactive (in System.Reactive.dll)
Syntax
'Declaration
<ExtensionAttribute> _
Public Shared Function MaxBy(Of TSource, TKey) ( _
source As IObservable(Of TSource), _
keySelector As Func(Of TSource, TKey), _
comparer As IComparer(Of TKey) _
) As IObservable(Of IList(Of TSource))
'Usage
Dim source As IObservable(Of TSource)
Dim keySelector As Func(Of TSource, TKey)
Dim comparer As IComparer(Of TKey)
Dim returnValue As IObservable(Of IList(Of TSource))
returnValue = source.MaxBy(keySelector, _
comparer)
public static IObservable<IList<TSource>> MaxBy<TSource, TKey>(
this IObservable<TSource> source,
Func<TSource, TKey> keySelector,
IComparer<TKey> comparer
)
[ExtensionAttribute]
public:
generic<typename TSource, typename TKey>
static IObservable<IList<TSource>^>^ MaxBy(
IObservable<TSource>^ source,
Func<TSource, TKey>^ keySelector,
IComparer<TKey>^ comparer
)
static member MaxBy :
source:IObservable<'TSource> *
keySelector:Func<'TSource, 'TKey> *
comparer:IComparer<'TKey> -> IObservable<IList<'TSource>>
JScript does not support generic types and methods.
Type Parameters
- TSource
The type of source.
- TKey
The type of key.
Parameters
- source
Type: System.IObservable<TSource>
An observable sequence to get the maximum elements for.
- keySelector
Type: System.Func<TSource, TKey>
The key selector function.
- comparer
Type: System.Collections.Generic.IComparer<TKey>
The comparer used to compare key values.
Return Value
Type: System.IObservable<IList<TSource>>
The elements in an 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 IObservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .