[This is preliminary documentation and is subject to change.]

Gets value indicating if collection contains exactly one element

Namespace: Tools.LinqT
Assembly: Tools (in Tools.dll) Version: 1.5.3.38916 (1.5.3.38916)

Syntax

C#
public static bool Single(
	this IEnumerable collection
)
Visual Basic
<ExtensionAttribute> _
Public Shared Function Single ( _
	collection As IEnumerable _
) As Boolean
Visual C++
[ExtensionAttribute]
public:
static bool Single(
	IEnumerable^ collection
)
F#
static member Single : 
        collection:IEnumerable -> bool
JScript
public static function Single(
	collection : IEnumerable
) : boolean

Parameters

collection
Type: System.Collections..::..IEnumerable
Collection to check

Return Value

True if collection contains exactly one element

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .

Exceptions

ExceptionCondition
System..::..ArgumentNullExceptioncollection is null

See Also

Collapse/expand Version History

1.5.3

  • This function is new in version 1.5.3