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

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

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

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