QueryableExtensions.FirstAsync QueryableExtensions.FirstAsync QueryableExtensions.FirstAsync Method

Definition

Overloads

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

Asynchronously returns the first element of a sequence that satisfies a specified condition.

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

Asynchronously returns the first element of a sequence.

FirstAsync<TSource>(IQueryable<TSource>) FirstAsync<TSource>(IQueryable<TSource>) FirstAsync<TSource>(IQueryable<TSource>)

Asynchronously returns the first element of a sequence.

FirstAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) FirstAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) FirstAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>)

Asynchronously returns the first element of a sequence that satisfies a specified condition.

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

Asynchronously returns the first element of a sequence that satisfies a specified condition.

[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<TSource> FirstAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,bool>> predicate, System.Threading.CancellationToken cancellationToken);
static member FirstAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, bool>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<'Source>

Type Parameters

TSource

The type of the elements of source.

Parameters

source
IQueryable<TSource>

An IQueryable<T> to return the first element of.

predicate
Expression<Func<TSource,Boolean>>

A function to test each element for a condition.

cancellationToken
CancellationToken CancellationToken CancellationToken

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

Returns

Task<TSource>

A task that represents the asynchronous operation. The task result contains the first element in source that passes the test in predicate.

Exceptions

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.

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

Asynchronously returns the first element of a sequence.

public static System.Threading.Tasks.Task<TSource> FirstAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Threading.CancellationToken cancellationToken);
static member FirstAsync : System.Linq.IQueryable<'Source> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<'Source>

Type Parameters

TSource

The type of the elements of source.

Parameters

source
IQueryable<TSource>

An IQueryable<T> to return the first element of.

cancellationToken
CancellationToken CancellationToken CancellationToken

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

Returns

Task<TSource>

A task that represents the asynchronous operation. The task result contains the first element in source.

Exceptions

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.

FirstAsync<TSource>(IQueryable<TSource>) FirstAsync<TSource>(IQueryable<TSource>) FirstAsync<TSource>(IQueryable<TSource>)

Asynchronously returns the first element of a sequence.

public static System.Threading.Tasks.Task<TSource> FirstAsync<TSource> (this System.Linq.IQueryable<TSource> source);
static member FirstAsync : System.Linq.IQueryable<'Source> -> System.Threading.Tasks.Task<'Source>
<Extension()>
Public Function FirstAsync(Of TSource) (source As IQueryable(Of TSource)) As Task(Of TSource)

Type Parameters

TSource

The type of the elements of source.

Parameters

source
IQueryable<TSource>

An IQueryable<T> to return the first element of.

Returns

Task<TSource>

A task that represents the asynchronous operation. The task result contains the first element in source.

Exceptions

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.

FirstAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) FirstAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) FirstAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>)

Asynchronously returns the first element of a sequence that satisfies a specified condition.

[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<TSource> FirstAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,bool>> predicate);
static member FirstAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, bool>> -> System.Threading.Tasks.Task<'Source>
<Extension()>
Public Function FirstAsync(Of TSource) (source As IQueryable(Of TSource), predicate As Expression(Of Func(Of TSource, Boolean))) As Task(Of TSource)

Type Parameters

TSource

The type of the elements of source.

Parameters

source
IQueryable<TSource>

An IQueryable<T> to return the first element of.

predicate
Expression<Func<TSource,Boolean>>

A function to test each element for a condition.

Returns

Task<TSource>

A task that represents the asynchronous operation. The task result contains the first element in source that passes the test in predicate.

Exceptions

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.

Applies to