QueryableExtensions.AnyAsync Method
Definition
Important
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Overloads
| AnyAsync<TSource>(IQueryable<TSource>) |
Asynchronously determines whether a sequence contains any elements. |
| AnyAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>) |
Asynchronously determines whether any element of a sequence satisfies a condition. |
| AnyAsync<TSource>(IQueryable<TSource>, CancellationToken) |
Asynchronously determines whether a sequence contains any elements. |
| AnyAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>, CancellationToken) |
Asynchronously determines whether any element of a sequence satisfies a condition. |
AnyAsync<TSource>(IQueryable<TSource>)
Asynchronously determines whether a sequence contains any elements.
public static System.Threading.Tasks.Task<bool> AnyAsync<TSource> (this System.Linq.IQueryable<TSource> source);static member AnyAsync : System.Linq.IQueryable<'Source> -> System.Threading.Tasks.Task<bool><Extension()>
Public Function AnyAsync(Of TSource) (source As IQueryable(Of TSource)) As Task(Of Boolean)Type Parameters
- TSource
The type of the elements of source.
Parameters
- source
- IQueryable<TSource>
An IQueryable<T> to check for being empty.
Returns
A task that represents the asynchronous operation.
The task result contains true if the source sequence contains any elements; otherwise, false.
Exceptions
source
is
null
.
source
doesn't implement
IDbAsyncQueryProvider
.
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
AnyAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>)
Asynchronously determines whether any element of a sequence satisfies a condition.
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<bool> AnyAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,bool>> predicate);static member AnyAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, bool>> -> System.Threading.Tasks.Task<bool><Extension()>
Public Function AnyAsync(Of TSource) (source As IQueryable(Of TSource), predicate As Expression(Of Func(Of TSource, Boolean))) As Task(Of Boolean)Type Parameters
- TSource
The type of the elements of source.
Parameters
- source
- IQueryable<TSource>
An IQueryable<T> whose elements to test for a condition.
- predicate
- Expression<Func<TSource,Boolean>>
A function to test each element for a condition.
Returns
A task that represents the asynchronous operation.
The task result contains true if any elements in the source sequence pass the test in the specified predicate; otherwise, false.
- Attributes
Exceptions
source
or
predicate
is
null
.
source
doesn't implement
IDbAsyncQueryProvider
.
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
AnyAsync<TSource>(IQueryable<TSource>, CancellationToken)
Asynchronously determines whether a sequence contains any elements.
public static System.Threading.Tasks.Task<bool> AnyAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Threading.CancellationToken cancellationToken);static member AnyAsync : System.Linq.IQueryable<'Source> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<bool>Type Parameters
- TSource
The type of the elements of source.
Parameters
- source
- IQueryable<TSource>
An IQueryable<T> to check for being empty.
- 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 true if the source sequence contains any elements; otherwise, false.
Exceptions
source
is
null
.
source
doesn't implement
IDbAsyncQueryProvider
.
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
AnyAsync<TSource>(IQueryable<TSource>, Expression<Func<TSource,Boolean>>, CancellationToken)
Asynchronously determines whether any element of a sequence satisfies a condition.
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
public static System.Threading.Tasks.Task<bool> AnyAsync<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,bool>> predicate, System.Threading.CancellationToken cancellationToken);static member AnyAsync : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, bool>> * System.Threading.CancellationToken -> System.Threading.Tasks.Task<bool>Type Parameters
- TSource
The type of the elements of source.
Parameters
- source
- IQueryable<TSource>
An IQueryable<T> whose elements to test for a condition.
- 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 true if any elements in the source sequence pass the test in the specified predicate; otherwise, false.
- Attributes
Exceptions
source
or
predicate
is
null
.
source
doesn't implement
IDbAsyncQueryProvider
.
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
Entity Framework