IFindFluentExtensionsFirstOrDefaultTDocument, TProjection Method |
Get the first result or null.
Namespace: MongoDB.DriverAssembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.2.0
Syntax public static TProjection FirstOrDefault<TDocument, TProjection>(
this IFindFluent<TDocument, TProjection> find,
CancellationToken cancellationToken = null
)
<ExtensionAttribute>
Public Shared Function FirstOrDefault(Of TDocument, TProjection) (
find As IFindFluent(Of TDocument, TProjection),
Optional cancellationToken As CancellationToken = Nothing
) As TProjection
[<ExtensionAttribute>]
static member FirstOrDefault :
find : IFindFluent<'TDocument, 'TProjection> *
?cancellationToken : CancellationToken
(* Defaults:
let _cancellationToken = defaultArg cancellationToken null
*)
-> '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:
TProjectionA 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).
See Also