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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)

public static IObservable<IList<TSource>> MaxBy<TSource, TKey>(
	this IObservable<TSource> source,
	Func<TSource, TKey> keySelector,
	IComparer<TKey> comparer

Type Parameters


The type of source.


The type of key.


Type: System.IObservable<TSource>
An observable sequence to get the maximum elements for.
Type: System.Func<TSource, TKey>
The key selector function.
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 http://msdn.microsoft.com/en-us/library/bb384936.aspx or http://msdn.microsoft.com/en-us/library/bb383977.aspx.
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