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Showing content from https://morelinq.github.io/3.0/ref/api/html/M_MoreLinq_MoreEnumerable_CountDown__2.htm below:

Provides a countdown counter for a given count of elements at the tail of the sequence where zero always represents the last element, one represents the second-last element, two represents the third-last element and so on.

MoreLinq (in MoreLinq.dll) Version: 3.0.0

public static IEnumerable<TResult> CountDown<T, TResult>(
	this IEnumerable<T> source,
	int count,
	Func<T, Nullable<int>, TResult> resultSelector
)

<ExtensionAttribute>
Public Shared Function CountDown(Of T, TResult) ( 
	source As IEnumerable(Of T),
	count As Integer,
	resultSelector As Func(Of T, Nullable(Of Integer), TResult)
) As IEnumerable(Of TResult)

public:
[ExtensionAttribute]
generic<typename T, typename TResult>
static IEnumerable<TResult>^ CountDown(
	IEnumerable<T>^ source, 
	int count, 
	Func<T, Nullable<int>, TResult>^ resultSelector
)

[<ExtensionAttribute>]
static member CountDown : 
        source : IEnumerable<'T> * 
        count : int * 
        resultSelector : Func<'T, Nullable<int>, 'TResult> -> IEnumerable<'TResult> 

source

Type: System.Collections.GenericIEnumerableT
The source sequence.

count

Type: SystemInt32
Count of tail elements of source to count down.

resultSelector

Type: SystemFuncT, NullableInt32, TResult
A function that receives the element and the current countdown value for the element and which returns those mapped to a result returned in the resulting sequence. For elements before the last count, the coundown value is null.

T

The type of elements of source

TResult

The type of elements of the resulting sequence.

Type:

A sequence of results returned by

.

In Visual Basic and C#, you can call this method as an instance method on any object of type

. When you use instance method syntax to call this method, omit the first parameter. For more information, see

or

.

This method uses deferred execution semantics and streams its results. At most, count elements of the source sequence may be buffered at any one time unless source is a collection or a list.

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