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EntityFrameworkQueryableExtensions.LongCountAsync Method

Definition

Overloads

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

Asynchronously returns a Int64 that represents the total number of elements in a sequence.

LongCountAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>, CancellationToken)

Asynchronously returns a Int64 that represents the number of elements in a sequence that satisfy a condition.

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

Asynchronously returns a Int64 that represents the total number of elements in a sequence.

public static System.Threading.Tasks.Task<long> LongCountAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Threading.CancellationToken cancellationToken = default);
static member LongCountAsync : System.Linq.IQueryable<'Source> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<int64>
<Extension()>
Public Function LongCountAsync(Of TSource) (source As IQueryable(Of TSource), Optional cancellationToken As CancellationToken = Nothing) As Task(Of Long)

Type Parameters

TSource

The type of the elements of source.

Parameters

source
IQueryable<TSource>

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

cancellationToken
CancellationToken

A CancellationToken to observe while waiting for the task to complete.

Returns

A task that represents the asynchronous operation. The task result contains the number of elements in the input sequence.

Exceptions

source is null.

Remarks

Multiple active operations on the same context instance are not supported. Use await to ensure that any asynchronous operations have completed before calling another method on this context. See Avoiding DbContext threading issues for more information and examples.

See Querying data with EF Core for more information and examples.

Applies to

LongCountAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>, CancellationToken)

Asynchronously returns a Int64 that represents the number of elements in a sequence that satisfy a condition.

public static System.Threading.Tasks.Task<long> LongCountAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,bool>> predicate, System.Threading.CancellationToken cancellationToken = default);
static member LongCountAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, bool>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<int64>
<Extension()>
Public Function LongCountAsync(Of TSource) (source As IQueryable(Of TSource), predicate As Expression(Of Func(Of TSource, Boolean)), Optional cancellationToken As CancellationToken = Nothing) As Task(Of Long)

Type Parameters

TSource

The type of the elements of source.

Parameters

source
IQueryable<TSource>

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

predicate
Expression<Func<TSource,Boolean>>

A function to test each element for a condition.

cancellationToken
CancellationToken

A CancellationToken to observe while waiting for the task to complete.

Returns

A task that represents the asynchronous operation. The task result contains the number of elements in the sequence that satisfy the condition in the predicate function.

Exceptions

source or predicate is null.

Remarks

Multiple active operations on the same context instance are not supported. Use await to ensure that any asynchronous operations have completed before calling another method on this context. See Avoiding DbContext threading issues for more information and examples.

See Querying data with EF Core for more information and examples.

Applies to