MoreEnumerableGroupAdjacentTSource, TKey, TResult Method (IEnumerableTSource, FuncTSource, TKey, FuncTKey, IEnumerableTSource, TResult, IEqualityComparerTKey) |
Groups the adjacent elements of a sequence according to a
specified key selector function. The keys are compared by using
a comparer and each group's elements are projected by using a
specified function.
Namespace:
MoreLinq
Assembly:
MoreLinq (in MoreLinq.dll) Version: 2.5.0
Syntax public static IEnumerable<TResult> GroupAdjacent<TSource, TKey, TResult>(
this IEnumerable<TSource> source,
Func<TSource, TKey> keySelector,
Func<TKey, IEnumerable<TSource>, TResult> resultSelector,
IEqualityComparer<TKey> comparer
)
<ExtensionAttribute>
Public Shared Function GroupAdjacent(Of TSource, TKey, TResult) (
source As IEnumerable(Of TSource),
keySelector As Func(Of TSource, TKey),
resultSelector As Func(Of TKey, IEnumerable(Of TSource), TResult),
comparer As IEqualityComparer(Of TKey)
) As IEnumerable(Of TResult)
public:
[ExtensionAttribute]
generic<typename TSource, typename TKey, typename TResult>
static IEnumerable<TResult>^ GroupAdjacent(
IEnumerable<TSource>^ source,
Func<TSource, TKey>^ keySelector,
Func<TKey, IEnumerable<TSource>^, TResult>^ resultSelector,
IEqualityComparer<TKey>^ comparer
)
[<ExtensionAttribute>]
static member GroupAdjacent :
source : IEnumerable<'TSource> *
keySelector : Func<'TSource, 'TKey> *
resultSelector : Func<'TKey, IEnumerable<'TSource>, 'TResult> *
comparer : IEqualityComparer<'TKey> -> IEnumerable<'TResult>
Parameters
- source
- Type: System.Collections.GenericIEnumerableTSource
A sequence whose elements to group. - keySelector
- Type: SystemFuncTSource, TKey
A function to extract the key for each
element. - resultSelector
- Type: SystemFuncTKey, IEnumerableTSource, TResult
A function to map each key and
associated source elements to a result object. - comparer
- Type: System.Collections.GenericIEqualityComparerTKey
An IEqualityComparerT to
compare keys.
Type Parameters
- TSource
- The type of the elements of
source.
- TKey
- The type of the key returned by
keySelector.
- TResult
- The type of the elements in the
resulting sequence.
Return Value
Type:
IEnumerableTResultA collection of elements of type
TResult where each element represents
a projection over a group and its key.
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 method is implemented by using deferred execution and
streams the groupings. The grouping elements, however, are
buffered. Each grouping is therefore yielded as soon as it
is complete and before the next grouping occurs.
See Also