Click or drag to resize

MongoQueryableFirstOrDefaultAsyncTSource Method (IMongoQueryableTSource, CancellationToken)

Returns the first element of a sequence, or a default value if the sequence contains no elements.

Namespace:  MongoDB.Driver.Linq
Assembly:  MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.13.1-v2-13-x1+a7f8afe27855f38f4f72157d11ba2ae73895502e
Syntax
public static Task<TSource> FirstOrDefaultAsync<TSource>(
	this IMongoQueryable<TSource> source,
	CancellationToken cancellationToken = null
)

Parameters

source
Type: MongoDB.Driver.LinqIMongoQueryableTSource
The IMongoQueryableT to return the first element of.
cancellationToken (Optional)
Type: System.ThreadingCancellationToken
The cancellation token.

Type Parameters

TSource
The type of the elements of source.

Return Value

Type: TaskTSource
default(TSource) if source is empty; otherwise, the first element in source.

Usage Note

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