Method LongCountAsync

Namespace

MongoDB.Driver.Linq

Assembly

MongoDB.Driver.dll

LongCountAsync<TSource>(IMongoQueryable<TSource>, CancellationToken)

Returns the number of elements in a sequence.

public static Task<long> LongCountAsync<TSource>(this IMongoQueryable<TSource> source, CancellationToken cancellationToken = default)

Parameters

source IMongoQueryable<TSource>

The IMongoQueryable<T> that contains the elements to be counted.

cancellationToken CancellationToken

The cancellation token.

Returns

Task<long>

The number of elements in the input sequence.

Type Parameters

TSource

The type of the elements of source.

LongCountAsync<TSource>(IMongoQueryable<TSource>, Expression<Func<TSource, bool>>, CancellationToken)

Returns the number of elements in the specified sequence that satisfies a condition.

public static Task<long> LongCountAsync<TSource>(this IMongoQueryable<TSource> source, Expression<Func<TSource, bool>> predicate, CancellationToken cancellationToken = default)

Parameters

source IMongoQueryable<TSource>

An IMongoQueryable<T> that contains the elements to be counted.

predicate Expression<Func<TSource, bool>>

A function to test each element for a condition.

cancellationToken CancellationToken

The cancellation token.

Returns

Task<long>

The number of elements in the sequence that satisfies the condition in the predicate function.

Type Parameters

TSource

The type of the elements of source.