MoreEnumerableToArrayByIndexT, TResult(IEnumerableT, Int32, FuncT, Int32, FuncT, TResult) Method

Creates an array of user-specified length from an IEnumerableT where a function is used to determine the index at which an element will be placed in the array. The elements are projected into the array via an additional function.

Definition

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

C#

public static TResult[] ToArrayByIndex<T, TResult>(
	this IEnumerable<T> source,
	int length,
	Func<T, int> indexSelector,
	Func<T, TResult> resultSelector
)

VB

<ExtensionAttribute>
Public Shared Function ToArrayByIndex(Of T, TResult) ( 
	source As IEnumerable(Of T),
	length As Integer,
	indexSelector As Func(Of T, Integer),
	resultSelector As Func(Of T, TResult)
) As TResult()

C++

public:
[ExtensionAttribute]
generic<typename T, typename TResult>
static array<TResult>^ ToArrayByIndex(
	IEnumerable<T>^ source, 
	int length, 
	Func<T, int>^ indexSelector, 
	Func<T, TResult>^ resultSelector
)

F#

[<ExtensionAttribute>]
static member ToArrayByIndex : 
        source : IEnumerable<'T> * 
        length : int * 
        indexSelector : Func<'T, int> * 
        resultSelector : Func<'T, 'TResult> -> 'TResult[]

Parameters

source IEnumerableT: The source sequence for the array.
length Int32: The (non-negative) length of the resulting array.
indexSelector FuncT, Int32: A function that maps an element to its index.
resultSelector FuncT, TResult: A function to project a source element into an element of the resulting array.

Type Parameters

T: The type of the element in source.
TResult: The type of the element in the resulting array.

Return Value

TResult
An array of size length that contains the projected elements from the input sequence.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerableT. 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 method forces immediate query evaluation. It should not be used on infinite sequences. If more than one element maps to the same index then the latter element overwrites the former in the resulting array.