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Showing content from https://morelinq.github.io/3.0/ref/api/html/M_MoreLinq_MoreEnumerable_FallbackIfEmpty__1_1.htm below:

Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty.

MoreLinq (in MoreLinq.dll) Version: 3.0.0

public static IEnumerable<T> FallbackIfEmpty<T>(
	this IEnumerable<T> source,
	T fallback
)

<ExtensionAttribute>
Public Shared Function FallbackIfEmpty(Of T) ( 
	source As IEnumerable(Of T),
	fallback As T
) As IEnumerable(Of T)

public:
[ExtensionAttribute]
generic<typename T>
static IEnumerable<T>^ FallbackIfEmpty(
	IEnumerable<T>^ source, 
	T fallback
)

[<ExtensionAttribute>]
static member FallbackIfEmpty : 
        source : IEnumerable<'T> * 
        fallback : 'T -> IEnumerable<'T> 

source

Type: System.Collections.GenericIEnumerableT
The source sequence.

fallback

Type: T
The value to return in a singleton collection if source is empty.

T

The type of the elements in the sequences.

Type:

An

that contains

if

is empty; otherwise,

.

In Visual Basic and C#, you can call this method as an instance method on any object of type

. When you use instance method syntax to call this method, omit the first parameter. For more information, see

or

.

var numbers = new[] { 123, 456, 789 };
var result = numbers.Where(x => x == 100).FallbackIfEmpty(-1).Single();

The

variable will contain

.

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