IAggregateFluentExtensionsFirstOrDefaultTResult Method |
Returns the first document of the aggregate result, or the default value if the result set is empty.
Namespace:
MongoDB.Driver
Assembly:
MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.20.0+ee01960089f28ea1b501690df5fc9f6318a70242
Syntax public static TResult FirstOrDefault<TResult>(
this IAggregateFluent<TResult> aggregate,
CancellationToken cancellationToken = null
)
<ExtensionAttribute>
Public Shared Function FirstOrDefault(Of TResult) (
aggregate As IAggregateFluent(Of TResult),
Optional cancellationToken As CancellationToken = Nothing
) As TResult
[<ExtensionAttribute>]
static member FirstOrDefault :
aggregate : IAggregateFluent<'TResult> *
?cancellationToken : CancellationToken
(* Defaults:
let _cancellationToken = defaultArg cancellationToken null
*)
-> 'TResult
Parameters
- aggregate
- Type: MongoDB.DriverIAggregateFluentTResult
The aggregate. - cancellationToken (Optional)
- Type: System.ThreadingCancellationToken
The cancellation token.
Type Parameters
- TResult
- The type of the result.
Return Value
Type:
TResult
The fluent aggregate interface.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type
IAggregateFluentTResult. 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