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IAggregateFluentExtensionsFirstOrDefaultAsyncTResult 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: 2.7.3+Branch.v2.7.x.Sha.2f1f2be13a23b8520cb9c2ee8439c022f9a03efe
Syntax
public static Task<TResult> FirstOrDefaultAsync<TResult>(
	this IAggregateFluent<TResult> aggregate,
	CancellationToken cancellationToken = null
)

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: TaskTResult
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