MoreEnumerableLeadTSource, TResult Method (IEnumerableTSource, Int32, FuncTSource, TSource, TResult) |
Produces a projection of a sequence by evaluating pairs of elements separated by a positive offset.
Namespace:
MoreLinq
Assembly:
MoreLinq (in MoreLinq.dll) Version: 3.0.0
Syntax 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>
Parameters
- 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
Type Parameters
- TSource
- The type of the elements in the source sequence
- TResult
- The type of the elements in the result sequence
Return Value
Type:
IEnumerableTResultA sequence produced by projecting each element of the sequence with its lead pairing
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type
IEnumerableTSource. 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 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.
See Also