IFindFluentExtensionsFirstOrDefaultAsyncTDocument, TProjection Method

Get the first result or null.

Namespace: MongoDB.Driver
Assembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.5.0+57.Branch.master.Sha.6a4e00a2d91090c65a9b11364b9ebfdb9c7da076

Syntax

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public static Task<TProjection> FirstOrDefaultAsync<TDocument, TProjection>(
	this IFindFluent<TDocument, TProjection> find,
	CancellationToken cancellationToken = null
)

<ExtensionAttribute>
Public Shared Function FirstOrDefaultAsync(Of TDocument, TProjection) ( 
	find As IFindFluent(Of TDocument, TProjection),
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of TProjection)

[<ExtensionAttribute>]
static member FirstOrDefaultAsync : 
        find : IFindFluent<'TDocument, 'TProjection> * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<'TProjection>

Parameters

find: Type: MongoDB.DriverIFindFluentTDocument, TProjection
The fluent find.
cancellationToken (Optional): Type: System.ThreadingCancellationToken
The cancellation token.

Type Parameters

TDocument: The type of the document.
TProjection: The type of the projection (same as TDocument if there is no projection).

Return Value

Type: TaskTProjection
A Task whose result is the first result or null.

Usage Note

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

IFindFluentExtensions Class