QueryableExtensionMethods.FirstOrDefaultAsync<TSource> Method (IQueryable<TSource>, Expression<Func<TSource, Boolean>>, TSource, CancellationToken) |
Async variant of Queryable.FirstOrDefault
Namespace:
SD.LLBLGen.Pro.LinqSupportClasses
Assembly:
SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.10.0.0 (5.10.0)
Syntax public static Task<TSource> FirstOrDefaultAsync<TSource>(
this IQueryable<TSource> source,
Expression<Func<TSource, bool>> predicate,
TSource defaultValue,
CancellationToken cancellationToken
)
<ExtensionAttribute>
Public Shared Function FirstOrDefaultAsync(Of TSource) (
source As IQueryable(Of TSource),
predicate As Expression(Of Func(Of TSource, Boolean)),
defaultValue As TSource,
cancellationToken As CancellationToken
) As Task(Of TSource)
Parameters
- source
- Type: System.Linq.IQueryable<TSource>
The source. - predicate
- Type: System.Linq.Expressions.Expression<Func<TSource, Boolean>>
The predicate. - defaultValue
- Type: TSource
The default value to return if the sequence is empty - cancellationToken
- Type: System.Threading.CancellationToken
The cancellation token.
Type Parameters
- TSource
- The type of the source.
Return Value
Type:
Task<TSource>Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type
IQueryable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see
Extension Methods (Visual Basic) or
Extension Methods (C# Programming Guide).
See Also