MoreEnumerable.PartialSortBy<TSource, TKey>(IEnumerable<TSource>, Int32, Func<TSource, TKey>) Method

Combines OrderBy<TSource, TKey>(IEnumerable<TSource>, Func<TSource, TKey>, IComparer<TKey>), and Take<TSource>(IEnumerable<TSource>, Int32) in a single operation.

Definition

Namespace: MoreLinq
Assembly: MoreLinq (in MoreLinq.dll) Version: 3.4.0+b99a6a8cc504caf2d48372fe54a2f8116c59cd0c

C#
public static IEnumerable<TSource> PartialSortBy<TSource, TKey>(
	this IEnumerable<TSource> source,
	int count,
	Func<TSource, TKey> keySelector
)

VB
<ExtensionAttribute>
Public Shared Function PartialSortBy(Of TSource, TKey) ( 
	source As IEnumerable(Of TSource),
	count As Integer,
	keySelector As Func(Of TSource, TKey)
) As IEnumerable(Of TSource)

C++
public:
[ExtensionAttribute]
generic<typename TSource, typename TKey>
static IEnumerable<TSource>^ PartialSortBy(
	IEnumerable<TSource>^ source, 
	int count, 
	Func<TSource, TKey>^ keySelector
)

F#
[<ExtensionAttribute>]
static member PartialSortBy : 
        source : IEnumerable<'TSource> * 
        count : int * 
        keySelector : Func<'TSource, 'TKey> -> IEnumerable<'TSource> 

Parameters

source IEnumerable<TSource>: The source sequence.
count Int32: Number of (maximum) elements to return.
keySelector Func<TSource, TKey>: A function to extract a key from an element.

Type Parameters

TSource: Type of elements in the sequence.
TKey: Type of keys.

Return Value

IEnumerable<TSource>
A sequence containing at most top count elements from source, in ascending order of their keys.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

Remarks

This operator uses deferred execution and streams it results.