CompositeObjectSpace.FirstOrDefault<ObjectType>(Expression<Func<ObjectType, Boolean>>, Boolean) Method

Searches for the first object that matches the specified expression.

Namespace: DevExpress.ExpressApp

Assembly: DevExpress.ExpressApp.v25.1.dll

NuGet Package: DevExpress.ExpressApp

Declaration

C#

public override ObjectType FirstOrDefault<ObjectType>(
    Expression<Func<ObjectType, bool>> criteriaExpression,
    bool inTransaction
)
    where ObjectType : class

VB.NET

Public Overrides Function FirstOrDefault(Of ObjectType As Class)(
    criteriaExpression As Expression(Of Func(Of ObjectType, Boolean)),
    inTransaction As Boolean
) As ObjectType

Parameters

Name	Type	Description
criteriaExpression	Expression<Func<ObjectType, Boolean>>	A lambda expression to search for an object.
inTransaction	Boolean	true if the method takes unsaved changes into account; otherwise, false.

Type Parameters

Name	Description
ObjectType	A type of an object to be returned.

Returns

Type	Description
ObjectType	The first object that matches the specified criteria. null (Nothing in Visual Basic) if there is no object that matches the expression.

Remarks

To learn how to use this method, refer to the IObjectSpace.FirstOrDefault<ObjectType>(Expression<Func<ObjectType, Boolean>>, Boolean) method description.