ExperimentalEnumerableTrySingleT, TCardinality Method (IEnumerableT, TCardinality, TCardinality, TCardinality) |
Returns a tuple with the cardinality of the sequence and the
single element in the sequence if it contains exactly one element.
similar to SingleTSource(IEnumerableTSource).
Namespace:
MoreLinq.Experimental
Assembly:
MoreLinq (in MoreLinq.dll) Version: 3.3.1+b77df70598ab84c28cd43dcf74594024b6d575e1
Syntax public static (TCardinality , T , , , T1 , T2 , , ) TrySingle<T, TCardinality>(
this IEnumerable<T> source,
TCardinality zero,
TCardinality one,
TCardinality many
)
<ExtensionAttribute>
Public Shared Function TrySingle(Of T, TCardinality) (
source As IEnumerable(Of T),
zero As TCardinality,
one As TCardinality,
many As TCardinality
) As ( As TCardinality, As T, , , As T1, As T2, As , As )
public:
[ExtensionAttribute]
generic<typename T, typename TCardinality>
static ValueTuple<TCardinality, T> TrySingle(
IEnumerable<T>^ source,
TCardinality zero,
TCardinality one,
TCardinality many
)
[<ExtensionAttribute>]
static member TrySingle :
source : IEnumerable<'T> *
zero : 'TCardinality *
one : 'TCardinality *
many : 'TCardinality -> ValueTuple<'TCardinality, 'T>
Parameters
- source
- Type: System.Collections.GenericIEnumerableT
The source sequence. - zero
- Type: TCardinality
The value that is returned in the tuple if the sequence has zero
elements. - one
- Type: TCardinality
The value that is returned in the tuple if the sequence has a
single element only. - many
- Type: TCardinality
The value that is returned in the tuple if the sequence has two or
more elements.
Type Parameters
- T
-
The type of the elements of source.
- TCardinality
-
The type that expresses cardinality.
Return Value
Type:
ValueTupleTCardinality,
T
A tuple containing the identified
TCardinality
and either the single value of
T in the sequence
or its default value.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type
IEnumerableT. 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 uses immediate execution, but never consumes more
than two elements from the sequence.
See Also