Qbservable.MaxBy(Of TSource, TKey) Method (IQbservable(Of TSource), Expression(Of Func(Of TSource, TKey)), IComparer(Of 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)

<ExtensionAttribute> _
Public Shared Function MaxBy(Of TSource, TKey) ( _
	source As IQbservable(Of TSource), _
	keySelector As Expression(Of Func(Of TSource, TKey)), _
	comparer As IComparer(Of TKey) _
) As IQbservable(Of IList(Of TSource))
Dim source As IQbservable(Of TSource)
Dim keySelector As Expression(Of Func(Of TSource, TKey))
Dim comparer As IComparer(Of TKey)
Dim returnValue As IQbservable(Of IList(Of TSource))

returnValue = source.MaxBy(keySelector, _

Type Parameters


The type of source.


The type of key.


Type: System.Reactive.Linq.IQbservable(Of TSource)
A queryable observable sequence to get the maximum elements for.
Type: System.Linq.Expressions.Expression(Of Func(Of TSource, TKey))
The key selector function.
Type: System.Collections.Generic.IComparer(Of TKey)
The comparer used to compare key values.

Return Value

Type: System.Reactive.Linq.IQbservable(Of IList(Of 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(Of TSource). When you use instance method syntax to call this method, omit the first parameter. For more information, see https://msdn.microsoft.com/en-us/library/bb384936(v=vs.103).aspx or https://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.