Method SingleOrDefaultAsync
| MongoDB CSharp Driver API Reference (original) (raw)
Namespace
Assembly
MongoDB.Driver.dll
SingleOrDefaultAsync(IQueryable, 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.
public static Task<TSource> SingleOrDefaultAsync<TSource>(this IQueryable<TSource> source, CancellationToken cancellationToken = default)Parameters
source IQueryable
An IQueryable to return the single element of.
cancellationToken CancellationToken
The cancellation token.
Returns
The single element of the input sequence, or default(TSource) if the sequence contains no elements.
Type Parameters
TSource
The type of the elements of source.
SingleOrDefaultAsync(IQueryable, Expression<Func<TSource, bool>>, CancellationToken)
Returns the only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition.
public static Task<TSource> SingleOrDefaultAsync<TSource>(this IQueryable<TSource> source, Expression<Func<TSource, bool>> predicate, CancellationToken cancellationToken = default)Parameters
source IQueryable
An IQueryable to return a single element from.
predicate Expression<Func<TSource, bool>>
A function to test an element for a condition.
cancellationToken CancellationToken
The cancellation token.
Returns
The single element of the input sequence that satisfies the condition in predicate, or default(TSource) if no such element is found.
Type Parameters
TSource
The type of the elements of source.