MongoQueryable.SingleAsync(TSource) Method (IQueryable(TSource), CancellationToken)

MongoQueryableSingleAsyncTSource Method (IQueryableTSource, CancellationToken)

Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence.

Namespace: MongoDB.Driver.Linq
Assembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.1.0

Syntax

public static Task<TSource> SingleAsync<TSource>(
	this IQueryable<TSource> source,
	CancellationToken cancellationToken = null
)

<ExtensionAttribute>
Public Shared Function SingleAsync(Of TSource) ( 
	source As IQueryable(Of TSource),
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of TSource)

[<ExtensionAttribute>]
static member SingleAsync : 
        source : IQueryable<'TSource> * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<'TSource>

Parameters

source: Type: System.LinqIQueryableTSource
An IMongoQueryableT to return the single element of.
cancellationToken (Optional): Type: System.ThreadingCancellationToken
The cancellation token.

Type Parameters

TSource: The type of the elements of source.

Return Value

Type: TaskTSource
The single element of the input sequence.

Usage Note

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

Reference

MongoQueryable Class

SingleAsync Overload

MongoDB.Driver.Linq Namespace