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MongoQueryableSingleOrDefaultAsyncTSource Method (IQueryableTSource, CancellationToken)
Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.

Namespace: MongoDB.Driver.Linq
Assembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.2.0
public static Task<TSource> SingleOrDefaultAsync<TSource>(
	this IQueryable<TSource> source,
	CancellationToken cancellationToken = null


Type: System.LinqIQueryableTSource
An IMongoQueryableT to return the single element of.
cancellationToken (Optional)
Type: System.ThreadingCancellationToken
The cancellation token.

Type Parameters

The type of the elements of source.

Return Value

Type: TaskTSource
The single element of the input sequence, or default(TSource) if the sequence contains no elements.

Usage Note

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