MoreEnumerable.Lag<TSource, TResult>(IEnumerable<TSource>, Int32, TSource, Func<TSource, TSource, TResult>) Method
Produces a projection of a sequence by evaluating pairs of elements separated by a
negative offset.
Namespace: MoreLinqAssembly: MoreLinq (in MoreLinq.dll) Version: 3.4.0+b99a6a8cc504caf2d48372fe54a2f8116c59cd0c
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>
- source IEnumerable<TSource>
- The sequence over which to evaluate lag.
- offset Int32
- The offset (expressed as a positive number) by which to lag each
value of the sequence.
- defaultLagValue TSource
- A default value supplied for the lagged value prior to the
lag offset.
- resultSelector Func<TSource, TSource, TResult>
- A projection function which accepts the current and lagged
items (in that order) and returns a result.
- TSource
- The type of the elements of the source sequence.
- TResult
- The type of the elements of the result sequence.
IEnumerable<TResult>
A sequence produced by projecting each element of the sequence with its lagged
pairing.In Visual Basic and C#, you can call this method as an instance method on any object of type
IEnumerable<TSource>. 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).
This operator evaluates in a deferred and streaming manner.