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Showing content from https://morelinq.github.io/3.0/ref/api/html/M_MoreLinq_Extensions_LeadExtension_Lead__2.htm below:

LeadExtensionLeadTSource, TResult Method (IEnumerableTSource, Int32, FuncTSource, TSource, TResult)

Produces a projection of a sequence by evaluating pairs of elements separated by a positive offset.

MoreLinq (in MoreLinq.dll) Version: 3.0.0

public static IEnumerable<TResult> Lead<TSource, TResult>(
	this IEnumerable<TSource> source,
	int offset,
	Func<TSource, TSource, TResult> resultSelector
)

<ExtensionAttribute>
Public Shared Function Lead(Of TSource, TResult) ( 
	source As IEnumerable(Of TSource),
	offset As Integer,
	resultSelector As Func(Of TSource, TSource, TResult)
) As IEnumerable(Of TResult)

public:
[ExtensionAttribute]
generic<typename TSource, typename TResult>
static IEnumerable<TResult>^ Lead(
	IEnumerable<TSource>^ source, 
	int offset, 
	Func<TSource, TSource, TResult>^ resultSelector
)

[<ExtensionAttribute>]
static member Lead : 
        source : IEnumerable<'TSource> * 
        offset : int * 
        resultSelector : Func<'TSource, 'TSource, 'TResult> -> IEnumerable<'TResult> 

source

Type: System.Collections.GenericIEnumerableTSource
The sequence over which to evaluate Lead

offset

Type: SystemInt32
The offset (expressed as a positive number) by which to lead each element of the sequence

resultSelector

Type: SystemFuncTSource, TSource, TResult
A projection function which accepts the current and subsequent (lead) element (in that order) and produces a result

TSource

The type of the elements in the source sequence

TResult

The type of the elements in the result sequence

Type:

A sequence produced by projecting each element of the sequence with its lead pairing

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 operator evaluates in a deferred and streaming manner.
For elements of the sequence that are less than offset items from the end, default(T) is used as the lead value.

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