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

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

Creates an array 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.

Namespace:  MoreLinq
Assembly:

MoreLinq (in MoreLinq.dll) Version: 3.0.0

Syntax
public static TResult[] ToArrayByIndex<T, TResult>(
	this IEnumerable<T> source,
	Func<T, int> indexSelector,
	Func<T, int, TResult> resultSelector
)
<ExtensionAttribute>
Public Shared Function ToArrayByIndex(Of T, TResult) ( 
	source As IEnumerable(Of T),
	indexSelector As Func(Of T, Integer),
	resultSelector As Func(Of T, Integer, TResult)
) As TResult()
public:
[ExtensionAttribute]
generic<typename T, typename TResult>
static array<TResult>^ ToArrayByIndex(
	IEnumerable<T>^ source, 
	Func<T, int>^ indexSelector, 
	Func<T, int, TResult>^ resultSelector
)
[<ExtensionAttribute>]
static member ToArrayByIndex : 
        source : IEnumerable<'T> * 
        indexSelector : Func<'T, int> * 
        resultSelector : Func<'T, int, 'TResult> -> 'TResult[] 
Parameters
source
Type: System.Collections.GenericIEnumerableT
The source sequence for the array.
indexSelector
Type: SystemFuncT, Int32
A function that maps an element to its index.
resultSelector
Type: SystemFuncT, Int32, 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

Type:

TResult

An array that contains the projected elements from the input sequence. The size of the array will be as large as the highest index returned by the

indexSelector

plus 1.

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

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