ExperimentalEnumerableTrySingleT, TCardinality, TResult(IEnumerableT, TCardinality, TCardinality, TCardinality, FuncTCardinality, T, TResult) Method

public static TResult TrySingle<T, TCardinality, TResult>(
	this IEnumerable<T> source,
	TCardinality zero,
	TCardinality one,
	TCardinality many,
	Func<TCardinality, T, TResult> resultSelector
)

<ExtensionAttribute>
Public Shared Function TrySingle(Of T, TCardinality, TResult) ( 
	source As IEnumerable(Of T),
	zero As TCardinality,
	one As TCardinality,
	many As TCardinality,
	resultSelector As Func(Of TCardinality, T, TResult)
) As TResult

public:
[ExtensionAttribute]
generic<typename T, typename TCardinality, typename TResult>
static TResult TrySingle(
	IEnumerable<T>^ source, 
	TCardinality zero, 
	TCardinality one, 
	TCardinality many, 
	Func<TCardinality, T, TResult>^ resultSelector
)

[<ExtensionAttribute>]
static member TrySingle : 
        source : IEnumerable<'T> * 
        zero : 'TCardinality * 
        one : 'TCardinality * 
        many : 'TCardinality * 
        resultSelector : Func<'TCardinality, 'T, 'TResult> -> 'TResult 

Parameters

source  IEnumerableT

The source sequence.

zero  TCardinality

The value that is passed as the first argument to resultSelector if the sequence has zero elements.

one  TCardinality

The value that is passed as the first argument to resultSelector if the sequence has a single element only.

many  TCardinality

The value that is passed as the first argument to resultSelector if the sequence has two or more elements.

resultSelector  FuncTCardinality, T, TResult

A function that receives the cardinality and, if the sequence has just one element, the value of that element as argument and projects a resulting value of type TResult.

Type Parameters

T

The type of the elements of source.

TCardinality

The type that expresses cardinality.

TResult

The type of the result value returned by the resultSelector function.

Return Value

Usage Note

Reference