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MongoQueryableSingleAsyncTSource Method (IQueryableTSource, ExpressionFuncTSource, Boolean, CancellationToken)
Returns the only element of a sequence that satisfies a specified condition, and throws an exception if more than one such element exists.

Namespace: MongoDB.Driver.Linq
Assembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.2.0
Syntax
public static Task<TSource> SingleAsync<TSource>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, bool>> predicate,
	CancellationToken cancellationToken = null
)

Parameters

source
Type: System.LinqIQueryableTSource
An IMongoQueryableT to return a single element from.
predicate
Type: System.Linq.ExpressionsExpressionFuncTSource, Boolean
A function to test an element for a condition.
cancellationToken (Optional)
Type: System.ThreadingCancellationToken
The cancellation token.

Type Parameters

TSource
The type of the elements of source.

Return Value

Type: TaskTSource
The single element of the input sequence that satisfies the condition in predicate.

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