ObjectTransactionFindFirstOrDefaultTObject Method (ExpressionFuncTObject, Boolean, FuncTObject, Boolean)

Searches through both committed and uncommitted objects for a single object, matching the predicate. Returns null if not found.

Namespace: Aloe.SystemFrameworks.Domain
Assembly: Aloe.SystemFrameworks.Domain (in Aloe.SystemFrameworks.Domain.dll) Version: 20.1.3.5

Syntax

C++

Copy

public TObject FindFirstOrDefault<TObject>(
	Expression<Func<TObject, bool>> predicate,
	Func<TObject, bool> compiledPredicate = null
)
where TObject : DomainObject

Public Function FindFirstOrDefault(Of TObject As DomainObject) ( 
	predicate As Expression(Of Func(Of TObject, Boolean)),
	Optional compiledPredicate As Func(Of TObject, Boolean) = Nothing
) As TObject

public:
generic<typename TObject>
where TObject : DomainObject
TObject FindFirstOrDefault(
	Expression<Func<TObject, bool>^>^ predicate, 
	Func<TObject, bool>^ compiledPredicate = nullptr
)

member FindFirstOrDefault : 
        predicate : Expression<Func<'TObject, bool>> * 
        ?compiledPredicate : Func<'TObject, bool> 
(* Defaults:
        let _compiledPredicate = defaultArg compiledPredicate null
*)
-> 'TObject  when 'TObject : DomainObject

Parameters

predicate: Type: System.Linq.ExpressionsExpressionFuncTObject, Boolean
The predicate to match.
compiledPredicate (Optional): Type: SystemFuncTObject, Boolean
The compiled predicate. Should be the same predicate, but in compiled form. If not specified, the compilation occurs in runtime.

Type Parameters

TObject: The type of the object to enumerate.

Return Value

Type: TObject
The found object or null.

Remarks

Because it knows, that it has to find only a single object, the method searches first locally and queries the data source only if no object is found locally.

Reference

ObjectTransaction Class

FindFirstOrDefault Overload

Aloe.SystemFrameworks.Domain Namespace