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
)

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.

See Also